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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period $ 24,797 $ 24,797 $ 27,019 $ 20,781
Loans charged-off   (2,854) (8,933) (4,246)
Recoveries of loans charged-off   1,650 1,610 2,047
Net loans (charged-off) recovered   (1,204) (7,323) (2,199)
Provision for (reversal of) loan losses   20,110 [1] 5,101 8,437
Balance at end of period 24,797 49,006 24,797 27,019
Construction real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 3,539 3,539 3,597 3,676
Loans charged-off   (40) 0 (14)
Recoveries of loans charged-off   28 12 7
Net loans (charged-off) recovered   (12) 12 (7)
Provision for (reversal of) loan losses   10 [1] (70) (72)
Balance at end of period 3,539 6,490 3,539 3,597
1-4 family residential real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 3,833 3,833 3,844 2,445
Loans charged-off   (152) (126) (91)
Recoveries of loans charged-off   32 68 356
Net loans (charged-off) recovered   (120) (58) 265
Provision for (reversal of) loan losses   10 [1] 47 1,134
Balance at end of period 3,833 2,270 3,833 3,844
Commercial real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 9,572 9,572 13,968 10,821
Loans charged-off   (33) (5,247) (783)
Recoveries of loans charged-off   102 113 36
Net loans (charged-off) recovered   69 (5,134) (747)
Provision for (reversal of) loan losses   18,005 [1] 738 3,894
Balance at end of period 9,572 35,709 9,572 13,968
Commercial loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 6,351 6,351 3,974 2,094
Loans charged-off   (823) (1,162) (756)
Recoveries of loans charged-off   310 250 244
Net loans (charged-off) recovered   (513) (912) (512)
Provision for (reversal of) loan losses   1,823 [1] 3,289 2,392
Balance at end of period 6,351 4,107 6,351 3,974
Municipal loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 570 570 525 860
Loans charged-off   0 0 0
Recoveries of loans charged-off   0 0 0
Net loans (charged-off) recovered   0 0 0
Provision for (reversal of) loan losses   (2) [1] 45 (335)
Balance at end of period 570 46 570 525
Loans to individuals        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 932 932 1,111 885
Loans charged-off   (1,806) (2,398) (2,602)
Recoveries of loans charged-off   1,178 1,167 1,404
Net loans (charged-off) recovered   (628) (1,231) (1,198)
Provision for (reversal of) loan losses   264 [1] 1,052 1,424
Balance at end of period 932 $ 384 $ 932 $ 1,111
Impact of CECL adoption        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment 5,072      
Impact of CECL adoption - purchased loans with credit deterioration 231      
Balance at end of period 5,303      
Impact of CECL adoption | Construction real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment 2,968      
Impact of CECL adoption - purchased loans with credit deterioration (15)      
Balance at end of period 2,953      
Impact of CECL adoption | 1-4 family residential real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment (1,447)      
Impact of CECL adoption - purchased loans with credit deterioration (6)      
Balance at end of period (1,453)      
Impact of CECL adoption | Commercial real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment 7,730      
Impact of CECL adoption - purchased loans with credit deterioration 333      
Balance at end of period 8,063      
Impact of CECL adoption | Commercial loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment (3,532)      
Impact of CECL adoption - purchased loans with credit deterioration (22)      
Balance at end of period (3,554)      
Impact of CECL adoption | Municipal loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment (522)      
Impact of CECL adoption - purchased loans with credit deterioration 0      
Balance at end of period (522)      
Impact of CECL adoption | Loans to individuals        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment (125)      
Impact of CECL adoption - purchased loans with credit deterioration (59)      
Balance at end of period $ (184)      
[1] The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL methodology.