Fair Value Measurements (Assumptions for Mortgage Servicing Rights) (Details) $ in Thousands	Jul. 01, 2017 USD ($) Loans	Apr. 01, 2017 USD ($) Loans
Fair Value Disclosures [Abstract]
Number of loans serviced with MSRs | Loans	4,110	4,041
Weighted average servicing fee (basis points)	0.3169%	0.3142%
Capitalized servicing multiple	83.91%	74.79%
Capitalized servicing rate (basis points)	0.2659%	0.235%
Serviced portfolio with MSRs	$ 483,153	$ 472,492
Mortgage servicing rights	$ 1,285	$ 1,110