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OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Summary of the AOCI balances, net of tax        
Balance at beginning of period $ 886,971 $ 843,866 $ 856,613 $ 835,054
Current Year Change 767 (11,634) 1,378 (35,162)
Balance at end of period 893,400 843,063 893,400 843,063
Accumulated Other Comprehensive Income        
Summary of the AOCI balances, net of tax        
Balance at beginning of period (31,368) (21,654) (31,979) 1,874
Current Year Change     1,378 (35,162)
Balance at end of period (30,601) (33,288) (30,601) (33,288)
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     1,351 (35,169)
Balance at end of period (31,583) (34,279) (31,583) (34,279)
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     27 7
Balance at end of period $ 982 $ 991 $ 982 $ 991