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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
Mar. 31, 2020
Mar. 31, 2019
Derivatives, Fair Value [Line Items]    
Reclassification adjustment for gain on hedging activities, tax $ 52 $ 33
Amount of (loss) gain recognized in other comprehensive income, net of tax $403 and $116 (1,145) (331)
Amount of (loss) gain recognized in other comprehensive income, tax 403 116
Not designated as hedging: | Mortgage Banking Income    
Derivatives, Fair Value [Line Items]    
Gains (losses) on derivative financial instruments 4,916 (640)
Designated as hedging:    
Derivatives, Fair Value [Line Items]    
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease) 135 149
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 147 94
(Loss) gain included in interest expense on borrowings (12) 55
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income    
Derivatives, Fair Value [Line Items]    
Gains (losses) on derivative financial instruments 20,462 1,880
Forward commitments | Not designated as hedging: | Mortgage Banking Income    
Derivatives, Fair Value [Line Items]    
Gains (losses) on derivative financial instruments (26,457) (4,404)
Futures contracts | Not designated as hedging: | Mortgage Banking Income    
Derivatives, Fair Value [Line Items]    
Gains (losses) on derivative financial instruments 10,911 1,871
Option contracts | Not designated as hedging: | Mortgage Banking Income    
Derivatives, Fair Value [Line Items]    
Gains (losses) on derivative financial instruments $ 0 $ 13