Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	May 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of variable rate loans hedged using interest rate swaps	$ 1,000,000		$ 1,000,000
Amount hedged of borrowed funds using forward starting interest rate swaps	1,000,000		1,000,000			$ 685,000
Amount to be hedged of borrowed funds using forward starting interest rate swaps	$ 330,000		$ 330,000
Weighted-average interest rate to be paid	2.56%		2.56%
Interest rate cash flow hedge loss to be reclassified during next 12 months, net	$ (698)		$ (698)
Capital market products income	$ 2,154	$ 2,819	$ 3,433	$ 4,377
Portion of fair value of outstanding interest rate swaps covered by collateral agreements (percent)	100.00%		100.00%		100.00%