Annual report [Section 13 and 15(d), not S-K Item 405]

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Collateral-Dependent Loans) (Details)

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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Collateral-Dependent Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross $ 2,546,118 $ 2,651,550
Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 6,400 3,600
Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 5,286 3,554
Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,087 94
Commercial, Financial, Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 180,341 189,208
Commercial, Financial, Agricultural [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Commercial, Financial, Agricultural [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,087 39
Real Estate - Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 146,920 219,994
Real Estate - Construction [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Construction [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Commercial Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 768,731 779,095
Real Estate - Commercial Mortgage [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 2,450 427
Real Estate - Commercial Mortgage [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Residential [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,025,690 1,042,504
Real Estate - Residential [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,275 2,476
Real Estate - Residential [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Home Equity [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 240,897 220,064
Real Estate - Home Equity [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,561 651
Real Estate - Home Equity [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 183,539 200,685
Consumer [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Consumer [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross $ 0 $ 55