Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Amount to be hedged of borrowed funds using forward starting interest rate swaps	$ 285,000		$ 285,000
Weighted-average interest rate to be paid (as a percent)	2.05%		2.05%
Pre-tax loss	$ (14,285)	$ 0	$ (14,285)	$ 0
Interest rate cash flow hedge loss to be reclassified during next 12 months, net	(2,300)		(2,300)
Capital market products income	$ 886	$ 4,161	$ 6,302	$ 7,594
Portion of fair value of outstanding interest rate swaps covered by collateral agreements (percent)	100.00%		100.00%		100.00%
Interest Rate Swap
Derivative [Line Items]
Amount of variable rate loans hedged using interest rate swaps	$ 430,000		$ 430,000
Amount hedged of borrowed funds using forward starting interest rate swaps	510,000		510,000
Interest Rate Swap Maturing Between March 2022 And August 2024
Derivative [Line Items]
Amount hedged of borrowed funds using forward starting interest rate swaps	225,000		225,000
Longer Term Pay Fixes Interest Rate Swaps
Derivative [Line Items]
Gross notional amount outstanding	1,100,000		$ 1,100,000
Pre-tax loss	$ 14,300