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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Reclassification adjustment for gain on hedging activities, tax $ 170 $ 45 $ 0
Amount of (loss) gain recognized in other comprehensive income, net of tax (914) 1,039 685
Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 3,288 298 (11,310)
Designated as hedging:      
Derivatives, Fair Value [Line Items]      
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease) 596 160 (168)
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 481 128 0
Gain (loss) included in interest expense on borrowings 115 32 (168)
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (2,112) (527) 340
Forward commitments | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 12,170 3,864 (11,987)
Futures contracts | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (6,723) (2,981) 315
Option contracts | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments $ (47) $ (58) $ 22