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OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary of the AOCI balances, net of tax      
Balance at beginning of period $ 856,613 $ 835,054 $ 823,323
Current Year Change 11,571 (33,853) (6,635)
Balance at end of period 912,756 856,613 835,054
Accumulated Other Comprehensive Income      
Summary of the AOCI balances, net of tax      
Balance at beginning of period (31,979) 1,874 8,509
Current Year Change 11,571 (33,853)  
Balance at end of period (20,408) (31,979) 1,874
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 11,525 (33,824)  
Balance at end of period (21,409) (32,934) 890
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 46 (29)  
Balance at end of period $ 1,001 $ 955 $ 984