Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mortgage servicing rights	$ 831	$ 1,225
Recurring | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	5,237	5,443
Recurring | Securities issued by states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	6,306	4,370
Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	5,130	4,961
Recurring | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	13,987	9,829
Recurring | Interest rate lock commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (asset)	77	164
Recurring | Forward loan sale commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (liability)	(195)	(1,011)
Recurring | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mortgage servicing rights	831	1,225
Level 1 | Recurring | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 1 | Recurring | Securities issued by states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 1 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 1 | Recurring | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	13,987	9,829
Level 1 | Recurring | Interest rate lock commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (asset)	0	0
Level 1 | Recurring | Forward loan sale commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (liability)	0	0
Level 1 | Recurring | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mortgage servicing rights	0	0
Level 2 | Recurring | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	5,237	5,443
Level 2 | Recurring | Securities issued by states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	6,306	4,370
Level 2 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	5,130	4,961
Level 2 | Recurring | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 2 | Recurring | Interest rate lock commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (asset)	0	0
Level 2 | Recurring | Forward loan sale commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (liability)	0	0
Level 2 | Recurring | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mortgage servicing rights	0	0
Level 3 | Recurring | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 3 | Recurring | Securities issued by states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 3 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 3 | Recurring | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	0
Level 3 | Recurring | Interest rate lock commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (asset)	77	164
Level 3 | Recurring | Forward loan sale commitment derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives (liability)	(195)	(1,011)
Level 3 | Recurring | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mortgage servicing rights	$ 831	$ 1,225