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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income, Before-tax Amount $ 236,254 $ 42,116
Net income, Tax Effect (49,161) (3,595)
Net income 187,093 38,521
Net unrealized gains (losses) on investment securities available for sale: Before-tax Amount    
Net unrealized holding gains (losses) arising during the period, Before-tax Amount (165,241) 158,341
Reclassification adjustment for net losses realized in net income, Before-tax Amount 1,990 (8,734)
Net unrealized gains (losses), Before-tax Amount (163,251) 149,607
Net unrealized gains (losses) on investment securities available for sale: Tax Effect    
Net unrealized holding gains (losses) arising during the period, Tax Effect 42,781 (41,011)
Reclassification adjustment for net losses realized in net income, Tax Effect (515) 2,262
Net unrealized gains (losses), Tax Effect 42,266 (38,749)
Net unrealized gains (losses) on investment securities available for sale: Net of Tax Amount    
Net unrealized holding gains (losses) arising during the period, Net of Tax Amount (122,460) 117,330
Reclassification adjustment for net losses realized in net income, Net of Tax Amount 1,475 (6,472)
Net unrealized gains (losses), Net of Tax Amount (120,985) 110,858
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 (29,057) 108,639
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount (1,599) (120)
Net change, Before-tax Amount (30,656) 108,519
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Tax Effect    
Net unrealized gains (losses) arising during the period, Income Tax 7,874 (28,138)
Reclassification adjustment for realized (gains) losses included in net income, Income Tax 410 31
Net change, Income Tax 8,284 (28,107)
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 (21,183) 80,501
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount (1,189) (89)
Net change, Net of Tax Amount (22,372) 80,412
Other comprehensive income (loss), Before-tax Amount (193,907) 258,126
Other comprehensive income (loss), Tax Effect 50,550 (66,856)
Other Comprehensive Income (Loss), Net of Tax (143,357) 191,270
Comprehensive income, Net of Tax Amount $ 43,736 $ 229,791