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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amortized Cost:        
Balance at beginning of period $ 38,543 $ 40,195 $ 38,822 $ 40,944
Originations of mortgage servicing rights 1,203 1,508 2,386 2,428
Amortization (1,566) (1,829) (3,028) (3,498)
Balance at end of period 38,180 39,874 38,180 39,874
Valuation allowance:        
Balance at beginning of period (1,291) 0 (1,291) 0
(Additions) reductions to valuation allowance (1,291) 1,721 (1,291) 1,721
Balance at end of period 0 (1,721) 0 (1,721)
Net MSRs at end of period $ 38,180 $ 38,153 $ 38,180 $ 38,153