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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]      
Net tax expenses on reclassification adjustment on gain on hedging activities $ 0 $ 337 $ 170
Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings, net of tax expenses of $0, $337 and $170 0 955 481
Net tax expenses (benefits) recognized on net change in unrealized gain (loss) on hedging activities 293 (363) (322)
Net change in unrealized loss in hedging activities, net of tax expenses (benefits) of $293, $(363) and $(322) 831 (1,031) (914)
Not designated as hedging | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (9,482) (37,543) 3,288
Not designated as hedging | Interest rate-lock commitments | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (27,194) 27,339 (2,112)
Not designated as hedging | Forward commitments | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 25,661 (73,033) 12,170
Not designated as hedging | Futures contracts | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments (7,949) 8,151 (6,723)
Not designated as hedging | Option contracts | Mortgage Banking Income      
Derivatives, Fair Value [Line Items]      
Gains (losses) on derivative financial instruments 0 0 (47)
Designated as hedging      
Derivatives, Fair Value [Line Items]      
Total (577) 602 596
Net change in unrealized loss in hedging activities, net of tax expenses (benefits) of $293, $(363) and $(322) 831 (1,031) (914)
Designated as hedging | Interest Expense on Borrowings      
Derivatives, Fair Value [Line Items]      
Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings, net of tax expenses of $0, $337 and $170 0 955 481
Loss included in interest expense on borrowings $ (577) $ (353) $ 115