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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 113,363 $ 101,292 $ 47,555
Available-for-sale investment securities:      
Gross unrealized holding gain (loss) arising in the period 29,655 (161,730) (26,985)
Related tax (expense) benefit (6,817) 37,733 5,777
Reclassification adjustment for net loss included in net income 3,700 61 862
Related tax expense (864) (14) (192)
Net effect on other comprehensive income (loss) 25,674 (123,950) (20,538)
Defined benefit plans:      
Net (loss) gain arising during the period (303) 76 2,318
Related tax benefit (expense) 71 (18) (518)
Amortization of unrecognized loss on service benefit plans 9 63 103
Related tax benefit (2) (15) (23)
Realized loss due to settlement and curtailment 2,424 185 143
Related tax benefit (566) (43) (32)
Net effect on other comprehensive income 1,633 248 1,991
Cash flow hedges:      
Net (losses) gains arising during the period (2,293) 10,606 6,999
Related tax benefit (expense) 532 (2,421) (1,407)
Net effect on other comprehensive (loss) income (1,761) 8,185 5,592
Total other comprehensive income (loss), net of tax 25,546 (115,517) (12,955)
Total comprehensive income (loss) $ 138,909 $ (14,225) $ 34,600