Loan Servicing (Unpaid Principal Balances of Loans Serviced) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	$ 514,074	$ 496,600
Freddie Mac
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	403,111	365,863
Fannie Mae
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	62,958	75,162
Federal Home Loan Bank
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	46,759	54,399
Other investors
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	$ 1,246	$ 1,176