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Loans - TDR's by Class and Specific Reserves More Than 30 Days Past Due (Details)	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	7	9
Balance	$ 810,000	$ 1,651,000
Specific Reserves	$ 45,000	$ 0
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	1
Balance	$ 0	$ 658,000
Specific Reserves	$ 0	$ 0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	7
Balance	$ 643,000	$ 826,000
Specific Reserves	$ 45,000	$ 0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 167,000	$ 167,000
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0

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- Definition

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- Definition

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- Definition

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