Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt securities (gains) losses, net	$ (342)	$ (1,993)
Income tax (expense) benefit	(8,714)	17,630
Interest income (expense)	(222,785)	(148,120)
Salaries and employee benefits	124,147	68,117
Net income (loss)	27,586	(86,818)
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	538	1,628
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	342	1,993
Income tax (expense) benefit	(81)	(440)
Net income (loss)	261	1,553
Amount Reclassified from AOCI | Unrealized Gains and Losses on Held-to- Maturity Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	(74)	0
Interest income (expense)	310	0
Net income (loss)	236	0
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	(164)	(37)
Interest income (expense)	669	149
Net income (loss)	505	112
Amount Reclassified from AOCI | Defined Benefit Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	(3)	12
Salaries and employee benefits	11	(49)
Net income (loss)	$ 8	$ (37)