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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
 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 $ 136,577,000 $ 110,645,000 $ 393,795,000 $ 201,445,000
Other comprehensive income (loss), net of tax:        
Change in fair value on available-for-sale securities, net of tax (28,506,000) 523,000 (33,636,000) 69,402,000
Change in fair value of cash flow hedges, net of tax 0 (5,213,000) (18,373,000) 60,426,000
Accretion of net unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax (1,989,000) (1,523,000) (5,778,000) (3,504,000)
Net (gain) loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax (4,338,000) 156,000 (6,526,000) 1,858,000
Net gain on sale of investment securities reclassified from other comprehensive income into net income, net of tax 0 (481,000) (270,000) (728,000)
Total other comprehensive income (loss), net of tax (34,833,000) (6,538,000) (64,583,000) 127,454,000
Total comprehensive income $ 101,744,000 $ 104,107,000 $ 329,212,000 $ 328,899,000