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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Debt securities (gains) losses, net $ (1,207)     $ (4,921)     $ (3,892) $ (10,606)
Income tax (expense) benefit 17,680     12,154     49,270 24,854
Interest income (expense) (151,572)     (145,573)     (449,619) (435,015)
Salaries and employee benefits 71,005     69,860     211,762 215,589
Net income (71,746) $ (62,786) $ (86,818) (77,944) $ (51,705) $ (22,640) (221,350) (152,289)
Amount Reclassified from AOCI                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net income 2,098     4,985     5,528 10,951
Amount Reclassified from AOCI | Unrealized Gains and Losses on Available- for-Sale Debt Securities                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Debt securities (gains) losses, net 1,207     4,921     3,892 10,606
Income tax (expense) benefit (262)     (1,084)     (880) (2,347)
Net income 945     3,837     3,012 8,259
Amount Reclassified from AOCI | Gains and Losses on Cash Flow Hedges | Interest rate contracts                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income tax (expense) benefit (388)     (381)     (856) (897)
Interest income (expense) 1,578     1,550     3,483 3,651
Net income 1,190     1,169     2,627 2,754
Amount Reclassified from AOCI | Defined Benefit Pension Plans                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income tax (expense) benefit 12     7     36 20
Salaries and employee benefits (49)     (28)     (147) (82)
Net income $ (37)     $ (21)     $ (111) $ (62)