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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income $ 277,538 $ 226,409 $ 238,206
Change in debt securities available-for-sale:      
Unrealized holding gains (losses) for the period (187,955) 125,214 123,006
Reclassification adjustment for securities (gains) losses realized in income (4,327) (10,767) (1,923)
Income tax effect 43,997 (25,243) (27,604)
Unrealized gains (losses) on available-for-sale debt securities (148,285) 89,204 93,479
Change in securities held-to-maturity:      
Adjustment for securities transferred to available-for-sale 0 0 8,200
Amortization of unrealized losses on securities transferred     from available-for-sale 0 0 2,812
Income tax effect 0 0 (2,497)
Changes from securities held-to-maturity 0 0 8,515
Change in cash flow hedges:      
Net unrealized derivative gains (losses) on cash flow hedges 1,898 8,261 (543)
Reclassification adjustment for (gains) losses realized in net income (4,605) (5,153) (596)
Income tax effect 666 (764) 280
Changes from cash flow hedges (2,041) 2,344 (859)
Change in defined benefit pension plans:      
Amortization of net loss recognized in income 239 21 30
Income tax effect (59) (5) (8)
Changes from defined benefit pension plans 180 16 22
Other comprehensive income (loss) (150,146) 91,564 101,157
Comprehensive income $ 127,392 $ 317,973 $ 339,363