Quarterly report pursuant to Section 13 or 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) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 01, 2020
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss $ 21,083,000 $ 14,120,000 $ 13,905,000 $ 17,174,000 $ 14,210,000
Loans extended 1,841,304,000   1,822,024,000    
Accrued interest receivable 5,700,000   5,500,000    
Provision for credit losses 4,990,000        
Net loan charge-offs 1,081,000        
Interest income on nonaccrual loans 29,000        
Nonaccrual loans 4,874,000   4,472,000    
Real estate loans for which formal foreclosure proceedings were in process 600,000        
TDRs 16,900,000   17,600,000    
TDRs performing in accordance with modified terms 15,900,000   16,900,000    
Estimated loan loss reserves 800,000   1,500,000    
TDRs, for which there was a payment default and the loans were modified within the twelve months prior to default 100,000        
Loan modified with a recorded investment 200,000 $ 100,000      
Purchase of real estate secured adjustable rate loans 1,500,000        
Adjustments related to Covid 19 [Member]          
Financing Receivable, Allowance for Credit Loss $ 3,900,000        
Impact of Adoption of ASC 326 [Member]          
Financing Receivable, Allowance for Credit Loss     $ 3,269,000