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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivatives, Fair Value [Line Items]        
Reclassification adjustment for gain on hedging activities, tax $ (52) $ (42) $ (104) $ (75)
Amount of (loss) gain recognized in other comprehensive income (112) (564) (1,257) (895)
Amount of loss recognized in other comprehensive income, tax (40) (201) (443) (317)
Not designated as hedging: | Mortgage Banking Income        
Derivatives, Fair Value [Line Items]        
Gains (losses) on derivative financial instruments (3,821) 749 1,095 109
Designated as hedging:        
Derivatives, Fair Value [Line Items]        
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease) 86 158 221 307
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 148 119 295 213
(Loss) gain included in interest expense on borrowings (62) 39 (74) 94
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income        
Derivatives, Fair Value [Line Items]        
Gains (losses) on derivative financial instruments 9,541 1,875 30,003 3,755
Forward commitments | Not designated as hedging: | Mortgage Banking Income        
Derivatives, Fair Value [Line Items]        
Gains (losses) on derivative financial instruments (13,993) (5,264) (40,450) (9,668)
Futures contracts | Not designated as hedging: | Mortgage Banking Income        
Derivatives, Fair Value [Line Items]        
Gains (losses) on derivative financial instruments 631 4,107 11,542 5,978
Option contracts | Not designated as hedging: | Mortgage Banking Income        
Derivatives, Fair Value [Line Items]        
Gains (losses) on derivative financial instruments $ 0 $ 31 $ 0 $ 44