Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 2,460,846	$ 1,438,274
Net change	165,971	60,773
Balance	2,113,543	2,302,823
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	19,605	(24,279)
Net change	45,842	22,602
Balance	65,447	(1,677)
Unrealized Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	95,097	(18,305)
Net change	120,129	38,171
Balance	215,226	19,866
Unrealized Gains (Losses) on Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(328)
Balance		(328)
Accumulated OCI
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	114,702	(42,912)
Net change	165,971	60,773
Balance	$ 280,673	$ 17,861