Derivatives - Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Reclassification adjustment for gain on hedging activities, tax	$ (46)	$ 23	$ (121)	$ 22
Amount of (loss) gain recognized in other comprehensive income, net of tax	(256)		(1,151)
Amount of (loss) gain recognized in other comprehensive income, net of tax		169		1,638
Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	1,908	(2,509)	2,017	2,360
Designated as hedging:
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)	149	89	456	126
Designated as hedging: | Interest Expense on Borrowings
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from other comprehensive income and recognized in interest expense on borrowings	130	69	343	62
Gain included in interest expense on borrowings	19	20	113	64
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	447	(3,415)	4,202	(688)
Forward commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(3,227)	1,524	(12,895)	7,477
Futures contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	4,685	(563)	10,663	(4,379)
Option contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 3	$ (55)	$ 47	$ (50)