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Loans - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan	Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan costs	$ 4,053	$ 2,933	$ 3,686
Qualifying first mortgage loans	277,905	240,760	279,463
Loans pledged as collateral	$ 258,369	$ 244,170	$ 243,578
Loans classified as TDR | loan	82	90	84
Value of loans classified as TDR	$ 23,628	$ 26,524	$ 23,923
Number of TDR loans more than 30 days past due | loan	6	8
Value of TDR loans more than 30 days past due	$ 890	$ 1,121
Number of loans placed on TDR status | loan	0	0
Number of TDR loans involved in bankruptcy | loan	6
Value of TDR loans involved in bankruptcy	$ 1,073
Number of TDR loans on non-accrual status | loan	12
Value of TDR loans on non-accrual status	$ 1,703
Number of TDR loans in the process of foreclosure | loan	2
Value of TDR loans in the process of foreclosure	$ 215
Number of mortgage loans in the process of foreclosure | loan	14	16
Value of mortgage loans in the process of foreclosure	$ 1,399	$ 1,677
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due	30 days	30 days

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Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.

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Financing receivables that are greater than 30 days past due.

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Loans classified as troubled debt restructurings that are involved in foreclosure as of the balance sheet date.

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Mortgage Loans in Process of Foreclosure, Number

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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