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Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Residential Mortgage Loans Held For Sale [Line Items]      
Number of days for past due for a residential mortgage loan to be considered nonperforming (in days) 90 90  
Residential mortgage loans held for sale, nonperforming $ 0 $ 0  
Credit losses recognized on residential mortgage loans held for sale 0 0 $ 0
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Unpaid principal balance 227,161 175,117  
Residential mortgage loans held for sale, Fair value 236,444 177,703  
Residential mortgage loans held for sale $ 252,316 $ 182,271  
Not Designated as Hedging Instrument [Member] | Residential mortgage loan commitments [Member]      
Schedule of Residential Mortgage Loans Held For Sale [Line Items]      
General number of days outstanding for residential mortgage commitments, minimum (in days) 60 60  
General number of days outstanding for residential mortgage commitments, maximum (in days) 90 90  
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Derivative, Notional Amount $ 380,637 $ 158,460  
Derivative, Net fair value $ 20,435 $ 5,233  
Not Designated as Hedging Instrument [Member] | Forward sales contracts [Member]      
Schedule of Residential Mortgage Loans Held For Sale [Line Items]      
General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days) 60 60  
General number of days for delivery of loans, for which the price is set by forward sales contracts, maximum (in days) 90 90  
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Derivative, Notional Amount $ 549,414 $ 315,203  
Derivative, Net fair value $ (4,563) $ (665)