Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	$ 2,648	$ 2,070	$ (2,270)	$ 23,925
Interest Income | Interest Rate Contract
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	589	451	1,795	1,710
Mortgage Banking Income | Interest Rate Lock Commitments
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	(3,251)	(1,135)	(12,655)	23,610
Mortgage Banking Income | Forward Commitments
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	$ 5,310	$ 2,754	$ 8,590	$ (1,395)