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OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Summary of the AOCI balances, net of tax    
Balance at beginning of period $ 912,756 $ 856,613
Current Year Change 486 3,905
Balance at end of period 935,583 882,202
Accumulated Other Comprehensive Income    
Summary of the AOCI balances, net of tax    
Balance at beginning of period (20,408) (31,979)
Current Year Change 486 3,905
Balance at end of period (19,922) (28,074)
Unrealized gain (loss) on AFS debt securities    
Summary of the AOCI balances, net of tax    
Balance at beginning of period (21,409) (32,934)
Current Year Change 429 3,900
Balance at end of period (20,980) (29,034)
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 1,001 955
Current Year Change 57 5
Balance at end of period $ 1,058 $ 960