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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Amortized Cost:    
Balance at beginning of period $ 37,663 $ 38,822
Originations of mortgage servicing rights 1,483 1,183
Amortization (1,398) (1,462)
Balance at end of period 37,748 38,543
Valuation allowance:    
Valuation Allowance - Balance at beginning and end of period 0 (1,291)
Net MSRs at end of period $ 37,748 $ 37,252