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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivatives, Fair Value [Line Items]
Reclassification adjustment for gain on hedging activities, tax	$ (41)	$ (46)	$ (145)	$ (121)
Amount of (loss) gain recognized in other comprehensive income	112	(256)	(1,145)	(1,151)
Amount of loss recognized in other comprehensive income, tax	40	(90)	(403)	(407)
Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(11,141)	1,908	(10,046)	2,017
Designated as hedging:
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)	(22)	149	199	456
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	115	130	410	343
(Loss) gain included in interest expense on borrowings	(137)	19	(211)	113
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	5,994	447	35,997	4,202
Forward commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(16,548)	(3,227)	(56,998)	(12,895)
Futures contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(587)	4,685	10,955	10,663
Option contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 0	$ 3	$ 0	$ 47

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Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification Before Tax And Derivative, Excluded Component Increase (Decrease Before Adjustments And Tax

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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