Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap termination expense	$ (31,852)	$ 0	$ 0
Interest rate cash flow hedge to be reclassified during next 12 months, net	(8,700)
Capital market products income	$ 6,961	$ 13,931	$ 7,721
Portion of fair value outstanding, interest rate swaps covered by collateral agreements (percent)	100.00%	100.00%
Longer Term Pay Fixes Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross notional amount outstanding	$ 1,600,000
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of variable rate loans hedged using interest rate swaps	430,000
Amount hedged of borrowed funds using forward starting interest rate swaps	25,000
Amount to be hedged of borrowed funds using forward staring interest rate swaps	$ 25,000
Weighted-average interest rate to be paid	0.60%
Gross notional amount outstanding	$ 455,000	$ 1,905,000