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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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, before-tax amount $ 240,708 $ 131,363 $ 719,975 $ 297,536
Net income, tax effect (53,935) (39,789) (159,910) (74,250)
Net income 186,773 91,574 560,065 223,286
Unrealized gains (losses) on investment securities available for sale: before-tax amount        
Net unrealized holding gains (losses) arising during the period, before-tax amount (55,472) (29,428) (174,371) 116,975
Reclassification adjustment for realized (gains) losses included in net income, before-tax amount (962) 1,550 1,028 (76,594)
Net change, before-tax amount (56,434) (27,878) (173,343) 40,381
Unrealized gains (losses) on investment securities available for sale: tax effect        
Net unrealized gains (losses) arising during the period, tax effect 14,035 7,622 45,091 (30,297)
Reclassification adjustment for realized (gains) losses included in net income, tax effect 243 (401) (272) 19,838
Net change, tax effect 14,278 7,221 44,819 (10,459)
Unrealized gains (losses) on investment securities available for sale: net of tax amount        
Net unrealized gains (losses) arising during the period, net of tax amount (41,437) (21,806) (129,280) 86,678
Reclassification adjustment for realized (gains) losses included in net income, net of tax amount (719) 1,149 756 (56,756)
Net change, net of tax amount (42,156) (20,657) (128,524) 29,922
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, before-tax amount        
Net unrealized gains (losses) arising during the period, before-tax amount (8,081) (8,954) (39,061) 108,508
Reclassification adjustment for realized (gains) losses included in net income, before-tax amount (4,009) (1,031) (9,265) (1,421)
Net change, before-tax amount (12,090) (9,985) (48,326) 107,087
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, income tax        
Net unrealized gains (losses) arising during the period, income tax 2,044 2,319 10,404 (28,104)
Reclassification adjustment for realized (gains) losses included in net income, income tax 1,014 267 2,349 368
Net change, income tax 3,058 2,586 12,753 (27,736)
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, net of tax amount        
Net unrealized gains (losses) arising during the period, net of tax amount (6,037) (6,635) (28,657) 80,404
Reclassification adjustment for realized (gains) losses included in net income, net of tax amount (2,995) (764) (6,916) (1,053)
Net change, net of tax amount (9,032) (7,399) (35,573) 79,351
Total other comprehensive income (loss), before-tax amount (68,524) (37,863) (221,669) 147,468
Total other comprehensive income (loss), tax effect 17,336 9,807 57,572 (38,195)
Total other comprehensive income (loss), net of tax (51,188) (28,056) (164,097) 109,273
Comprehensive income, net of tax amount $ 135,585 $ 63,518 $ 395,968 $ 332,559