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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 31,684 $ 31,882 $ 90,275 $ 79,538
Available-for-sale investment securities:        
Gross unrealized holding gain (loss) arising during the period 37,723 (34,330) 26,414 (26,002)
Related tax (expense) benefit (8,779) 7,671 (6,203) 6,178
Reclassification adjustment for net loss included in net income 74 7 428 2,108
Related tax (expense) benefit (18) 3 (100) (492)
Net effect on other comprehensive income (loss) 29,000 (26,649) 20,539 (18,208)
Defined benefit plan:        
Net (loss) gain arising during the period 0 (244) 0 (244)
Related tax benefit 0 57 0 57
Amortization of unrecognized loss and service cost on benefit plans 0 0 0 9
Related tax benefit (expense) 0 0 0 (2)
Reclassification from accumulated other comprehensive income ("AOCI") 0 2,424 0 2,424
Related tax benefit (expense) 0 (566) 0 (566)
Net effect on other comprehensive income 0 1,671 0 1,678
Cash flow hedges:        
Net (loss) gain arising during the period (1,698) 118 (1,885) (165)
Related tax benefit (expense) 395 (16) 440 35
Net effect on other comprehensive (loss) income (1,303) 102 (1,445) (130)
Total other comprehensive income (loss), net of tax 27,697 (24,876) 19,094 (16,660)
Total comprehensive income $ 59,381 $ 7,006 $ 109,369 $ 62,878