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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 71,746 $ 77,944 $ 221,350 $ 152,289
Change in debt securities available-for-sale:        
Unrealized holding gains (losses) for the period (3,595) 6,599 (112,927) 126,281
Reclassification adjustment for securities (gains) losses realized in income (1,207) (4,921) (3,892) (10,606)
Income tax effect 627 (281) 26,404 (25,598)
Unrealized gains (losses) on available-for-sale debt securities (4,175) 1,397 (90,415) 90,077
Cash flow hedges:        
Net unrealized derivative gains (losses) on cash flow hedges (164) (11) 2,612 7,546
Reclassification adjustment for (gains) losses realized in net income (1,578) (1,550) (3,483) (3,651)
Income tax effect 428 384 214 (957)
Changes from cash flow hedges (1,314) (1,177) (657) 2,938
Defined benefit pension plans:        
Amortization of net loss recognized in income 49 28 147 82
Income tax effect (12) (7) (36) (20)
Changes from defined benefit pension plans 37 21 111 62
Other comprehensive income (loss), net of tax (5,452) 241 (90,961) 93,077
Comprehensive income $ 66,294 $ 78,185 $ 130,389 $ 245,366