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Derivatives - Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]      
Reclassification adjustment for gain on hedging activities, tax $ 337 $ 170 $ 45
Amount of (loss) gain recognized in other comprehensive income (1,031) (914) 1,039
(Loss) gain recognized in other comprehensive income, expense (benefit), tax 363 322 (366)
Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (37,543) 3,288 298
Designated as hedging:      
Derivatives, Fair Value [Line Items]      
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease) 602 596 160
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 955 481 128
(Loss) gain included in interest expense on borrowings (353) 115 32
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 27,339 (2,112) (527)
Forward commitments | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (73,033) 12,170 3,864
Futures contracts | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 8,151 (6,723) (2,981)
Option contracts | Not designated as hedging: | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments $ 0 $ (47) $ (58)