Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Schedule of financial instruments with estimated fair values) (Details)

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FAIR VALUE MEASUREMENTS (Schedule of financial instruments with estimated fair values) (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Fair Value Disclosure Item Amounts [Domain] | Fair value inputs, Level 1 [Member]    
ASSETS:    
Mortgage Servicing Rights $ 0  
Loans, Net of Allowance for Credit Losses 0  
LIABILITIES:    
Long-Term Borrowings 0  
Fair Value Disclosure Item Amounts [Domain] | Fair Value, Inputs, Level 2 [Member]    
ASSETS:    
Mortgage Servicing Rights 0  
Loans, Net of Allowance for Credit Losses 0  
LIABILITIES:    
Long-Term Borrowings 362,000  
Fair Value Disclosure Item Amounts [Domain] | Fair Value, Inputs, Level 3 [Member]    
ASSETS:    
Mortgage Servicing Rights 1,182,000  
Loans, Net of Allowance for Credit Losses 2,472,305,000  
LIABILITIES:    
Long-Term Borrowings 0  
Investment Securities, Available for Sale 334,052,000 $ 413,294,000
Investment securities, held to maturity, fair value 582,648,000 612,701,000
Equity Securities 3,585,000 10,000
Loans Held for Sale 34,013,000 26,909,000
Loans, Net of Allowance for Credit Losses 2,676,098,000 2,522,617,000
Fair value inputs, Level 1 [Member]    
ASSETS:    
Cash 72,379,000 72,114,000
Short-Term Investments 95,119,000 528,536,000
Investment Securities, Held to Maturity 433,150,000 431,733,000
Equity Securities 0 0
Other Equity Securities 0 0
Mortgage Servicing Rights   0
Loans, Net of Allowance for Credit Losses   0
LIABILITIES:    
Deposits 0 0
Short-Term Borrowings 0 0
Subordinated Notes Payable 0 0
Long-Term Borrowings   0
Fair Value, Inputs, Level 2 [Member]    
ASSETS:    
Cash 0 0
Short-Term Investments 0 0
Investment Securities, Held to Maturity 149,498,000 180,968,000
Equity Securities 3,077,000 10,000
Other Equity Securities 2,848,000 2,848,000
Mortgage Servicing Rights   0
Loans, Net of Allowance for Credit Losses   0
LIABILITIES:    
Deposits 3,081,702,000 3,310,383,000
Short-Term Borrowings 41,696,000 56,793,000
Subordinated Notes Payable 44,910,000 45,763,000
Long-Term Borrowings   513,000
Fair Value, Inputs, Level 3 [Member]    
ASSETS:    
Cash 0 0
Short-Term Investments 0 0
Investment Securities, Held to Maturity 0 0
Equity Securities 0  
Loans Held for Sale   0
Other Equity Securities 0 0
Mortgage Servicing Rights   4,491,000
Loans, Net of Allowance for Credit Losses   2,377,229,000
LIABILITIES:    
Deposits 0 0
Short-Term Borrowings 0 0
Subordinated Notes Payable 0 0
Long-Term Borrowings   0
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
ASSETS:    
Cash 72,379,000 72,114,000
Short-Term Investments 95,119,000 528,536,000
Investment Securities, Held to Maturity 632,076,000 660,774,000
Equity Securities 3,077,000 10,000
Other Equity Securities 2,848,000 2,848,000
Mortgage Servicing Rights 704,000 2,599,000
Loans, Net of Allowance for Credit Losses 2,676,098,000 2,522,617,000
LIABILITIES:    
Deposits 3,540,445,000 3,939,317,000
Short-Term Borrowings 41,696,000 56,793,000
Subordinated Notes Payable 52,887,000 52,887,000
Long-Term Borrowings $ 364,000 $ 513,000