Loan Servicing (Unpaid Principal Balances of Loans Serviced) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	$ 320,790	$ 321,588
Freddie Mac
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	301,263	295,613
Fannie Mae
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	7,355	11,535
Federal Home Loan Bank
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	10,621	12,677
Other investors
Servicing Assets at Fair Value [Line Items]
Unpaid principle balance of loans serviced	$ 1,551	$ 1,763