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OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Summary of the AOCI balances, net of tax        
Balance at beginning of period $ 882,202 $ 841,575 $ 856,613 $ 835,054
Current Year Change (3,294) (7,611) 611 (23,528)
Balance at end of period 886,971 843,866 886,971 843,866
Accumulated Other Comprehensive Income        
Summary of the AOCI balances, net of tax        
Balance at beginning of period (28,074) (14,043) (31,979) 1,874
Current Year Change     611 (23,528)
Balance at end of period (31,368) (21,654) (31,368) (21,654)
Unrealized gain (loss) on AFS debt securities        
Summary of the AOCI balances, net of tax        
Balance at beginning of period     (32,934) 890
Current Year Change     578 (23,535)
Balance at end of period (32,356) (22,645) (32,356) (22,645)
Unrealized gain on AFS debt security for which a portion of OTTI has been recognized in earnings        
Summary of the AOCI balances, net of tax        
Balance at beginning of period     955 984
Current Year Change     33 7
Balance at end of period $ 988 $ 991 $ 988 $ 991