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Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Residential Mortgage Loans Held For Sale [Line Items]      
Number of days for past due for loan to be considered nonperforming (in days) 90 days 90 days 90 days
Residential mortgage loans held for sale, nonperforming $ 0 $ 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 214,717 269,772 212,525
Residential mortgage loans held for sale, Fair value 216,983 275,179 215,113
Total residential mortgage loans held for sale and mortgage loan commitments, net of forward sales contracts $ 223,301 $ 287,259 $ 221,378
Residential Mortgage Loan Commitments [Member] | Not Designated as Hedging Instrument [Member]      
Schedule of Residential Mortgage Loans Held For Sale [Line Items]      
General number of days outstanding for residential mortgage commitments, minimum (in days) 60 days 60 days 60 days
General number of days outstanding for residential mortgage commitments, maximum (in days) 90 days 90 days 90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Notional $ 251,231 $ 362,088 $ 222,919
Derivative, Net fair value $ 7,473 $ 10,993 $ 6,523
Forward sales contracts [Member] | Not Designated as Hedging Instrument [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 days 60 days 60 days
General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days) 90 days 90 days 90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Notional $ 440,735 $ 587,595 $ 380,159
Derivative, Net fair value $ (1,155) $ 1,087 $ (258)