Loans Receivable and Allowance for Loan and Lease Losses Loans Receivable and ALLL Text Tags (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Mar. 31, 2018 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 5,500,000		$ 5,500,000		$ 5,700,000
Financing Receivable, Modifications, Number of Contracts				1
Financing Receivable, Recorded Investment, Past Due	21,340,000		21,340,000		9,108,000
Other non-performing asset	$ 453,000		$ 453,000		$ 552,000
Number of Real Estate Properties	4		4		8
otherrealestateownedresidential					$ 438,000
Loans held-for-sale (HFS)	$ 0		$ 0
Number of Modified Loan Subsequently Defaulted			0
Loans and Leases Receivable, Related Parties	80,000		$ 80,000		120,000
Loans and Leases Receivable, Related Parties, Additions			0
Loans and Leases Receivable, Related Parties, Proceeds			40,000
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,200,000		3,200,000		1,900,000
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 2,300,000		$ 2,300,000		$ 3,900,000
Financing Receivable, Modifications, Number of Contracts			8		11
Business
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	0	3	1
Financing Receivable, Recorded Investment, Past Due	$ 6,234,000		$ 6,234,000		$ 1,607,000