Fair Value Measurements (Assumptions for Mortgage Servicing Rights) (Details) $ in Thousands	Dec. 31, 2016 USD ($) Loans	Apr. 02, 2016 USD ($) Loans
Fair Value Disclosures [Abstract]
Number of loans serviced with MSRs | Loans	3,948	3,728
Weighted average servicing fee (basis points)	0.3111%	0.3043%
Capitalized servicing multiple	70.56%	61.65%
Capitalized servicing rate (basis points)	0.2195%	0.1876%
Serviced portfolio with MSRs	$ 459,297	$ 428,324
Mortgage servicing rights	$ 1,008	$ 803