Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	$ 7,060	$ 1,847	$ (152)
Included in interest income on loans | Interest rate contracts
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	3,672	4,137	3,981
Included in 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	882	779	356
Included in mortgage banking income | Forward commitments
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	$ 2,506	$ (3,069)	$ (4,489)