Annual report pursuant to Section 13 and 15(d)

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES - Narratives (Details)

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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES - Narratives (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
LoanContracts
Dec. 31, 2019
USD ($)
LoanContracts
Dec. 31, 2018
USD ($)
LoanContracts
Jan. 01, 2020
USD ($)
Loans, net [Abstract]        
Accrued interest receivable $ 6,900,000 $ 5,500,000    
Interest income on nonaccrual loans 52,000 35,000    
Real estate loans for which formal foreclosure proceedings were in process 1,600,000 1,200,000    
TDRs 14,300,000 17,600,000    
TDRs performing in accordance with modified terms 13,900,000 16,900,000    
Estimated loan loss reserves $ 600,000 $ 1,500,000    
Number of Contracts | LoanContracts 3 7 6  
TDRs, for which there was a payment default and the loans were modified within the twelve months prior to default $ 0 $ 0    
Loan modified with a recorded investment 200,000 500,000 $ 700,000  
Purchase of real estate secured adjustable rate loans 48,400,000 25,200,000    
Net deferred fees 100,000 1,800,000    
Financing Receivable, Allowance for Credit Loss 23,816,000 $ 13,905,000   $ 17,174,000
Provision For Loan Losses Expensed 9,035,000      
Net loan charge-offs (2,393,000)      
Adjustments related to Covid 19 [Member]        
Financing Receivable, Allowance for Credit Loss 6,600,000      
Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss       3,269,000
Pre-tax cumulative effect transition adjustment       $ 3,300,000
Provision For Loan Losses Expensed 9,000,000.0      
Net loan charge-offs $ 2,400,000