Fair Value Measurements (Assumptions for Mortgage Servicing Rights) (Details) $ in Thousands	Mar. 31, 2018 USD ($) Loans	Apr. 01, 2017 USD ($) Loans
Fair Value Disclosures [Abstract]
Number of loans serviced with MSRs | Loans	4,346	4,041
Weighted-Average Servicing Fee of Loans Held-in-portfolio	0.3142%	0.3043%
Capitalized servicing multiple	84.76%	74.79%
Capitalized Loan Servicing Rate of Loans Held-in-portfolio	0.235%	0.1876%
Serviced portfolio with MSRs (in thousands)	$ 519,167	$ 472,492
Mortgage servicing rights (in thousands)	$ 1,410	$ 1,110