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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 83,573 $ 37,272 $ 131,995 $ 101,881
Debt securities available-for-sale:        
Net change in unrealized gains on debt securities available-for-sale 33,074 70,448 94,632 59,336
Related income tax effect (7,710) (16,909) (23,703) (14,074)
Net securities (gains) losses reclassified into earnings (55) 0 (104) 12
Related income tax effect (193) (58) (446) (178)
Net effect on other comprehensive income for the period 25,116 53,481 70,379 45,096
Defined benefit plans:        
Amortization of net gain and prior service costs (186) (101) (552) (304)
Related income tax effect 45 24 136 97
Net effect on other comprehensive loss for the period (141) (77) (416) (207)
Total other comprehensive income 24,975 53,404 69,963 44,889
Comprehensive income $ 108,548 $ 90,676 $ 201,958 $ 146,770