Goodwill and Other Intangibles (Summary of Goodwill and Other Intangibles) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Apr. 01, 2017
Indefinite lived:
Gross Carrying Amount	$ 81,060	$ 77,853
Net Carrying Amount	81,060	77,853
Finite lived:
Accumulated Amortization	(6,500)	(6,316)
Gross Carrying Amount	89,544	86,337
Net Carrying Amount	83,044	80,021
Customer relationships [Member]
Finite lived:
Gross Carrying Amount	7,100	7,100
Accumulated Amortization	(5,649)	(5,543)
Net Carrying Amount	1,451	1,557
Other Intangible Assets [Member]
Finite lived:
Gross Carrying Amount	1,384	1,384
Accumulated Amortization	(851)	(773)
Net Carrying Amount	533	611
Goodwill [Member]
Acquired Finite and Indefinite Lived Intangible Assets [Line Items]
Goodwill	72,760	69,753
Trademarks and trade names [Member]
Acquired Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets including goodwill.	7,200	7,000
State insurance licenses [Member]
Acquired Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets including goodwill.	$ 1,100	$ 1,100