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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net Income $ 157,063 $ 128,181 $ 138,257
Other comprehensive income (loss), before tax expense (benefit):      
Unrealized holding gains (losses) on securities arising during the period 18,499 (131,838) (29,892)
Unrealized holding gains (losses) on derivatives arising during the period 13,462 (31,573) (3,356)
Less: reclassification adjustment for losses (gains) on securities included in net income 103 (2) (16)
Unrealized gains for postretirement obligation:      
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax 76 76 76
Net gain 22 143 275
Total other comprehensive income (loss), before income tax expense (benefit) 32,162 (163,194) (32,913)
Income tax expense (benefit) related to items of other comprehensive income (loss) 6,226 (34,270) (6,912)
Comprehensive Income $ 182,999 $ (743) $ 112,256