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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Financial assets
Securities available for sale	$ 223,039				$ 185,261
Securities to be held to maturity, fair value	243,123				279,704
Restricted equity securities, at cost	14,257				13,912
Residential [Abstract]
Total loans	978,722				907,220
Mortgage servicing rights	1,915				2,088
Financial liabilities
Demand deposits	130,566				113,133
NOW deposits	242,638				199,977
Money market deposits	92,994				98,607
Savings deposits	206,009				165,601
Certificates of deposit	370,982				447,501
Total deposits	1,043,189	$ 1,058,365	$ 1,096,323	$ 966,825	1,024,819	$ 1,055,322	$ 1,033,436	$ 1,045,970
Level 1
Financial assets
Cash and cash equivalents	14,299				13,057
Interest-bearing deposits in other banks	4,013				3,559
Securities available for sale	0				0
Securities to be held to maturity, fair value	0				0
Restricted equity securities, at cost	0				0
Loans held for sale	0				0
Commercial [Abstract]
Municipal	0				0
Residential [Abstract]
Home equity line of credit	0				0
Consumer	0				0
Total loans	0				0
Mortgage servicing rights	0				0
Accrued interest receivable	0				0
Financial liabilities
Demand deposits	0				0
NOW deposits	0				0
Money market deposits	0				0
Savings deposits	0				0
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Accrued interest payable	0				0
Level 1 | Commercial Real Estate
Commercial [Abstract]
Loans	0				0
Level 1 | Commercial Construction
Commercial [Abstract]
Loans	0				0
Level 1 | Commercial Other Receivable
Commercial [Abstract]
Loans	0				0
Level 1 | Residential, Term, Financing Receivable
Residential [Abstract]
Loans	0				0
Level 1 | Residential, Construction, Financing Receivables
Residential [Abstract]
Loans	0				0
Level 2
Financial assets
Cash and cash equivalents	0				0
Interest-bearing deposits in other banks	0				0
Securities available for sale	223,039				185,261
Securities to be held to maturity, fair value	243,123				279,704
Restricted equity securities, at cost	14,257				13,912
Loans held for sale	349				0
Commercial [Abstract]
Municipal	0				0
Residential [Abstract]
Home equity line of credit	699				488
Consumer	0				0
Total loans	699				1,909
Mortgage servicing rights	1,915				2,088
Accrued interest receivable	4,912				4,748
Financial liabilities
Demand deposits	125,651				109,973
NOW deposits	224,627				186,490
Money market deposits	82,050				83,837
Savings deposits	181,010				146,936
Certificates of deposit	201,013				205,360
National certificates of deposit	169,617				242,824
Total deposits	983,968				975,420
Repurchase agreements	82,168				70,783
Federal Home Loan Bank advances	250,027				208,259
Total borrowed funds	332,195				279,042
Accrued interest payable	435				521
Level 2 | Commercial Real Estate
Commercial [Abstract]
Loans	0				431
Level 2 | Commercial Construction
Commercial [Abstract]
Loans	0				0
Level 2 | Commercial Other Receivable
Commercial [Abstract]
Loans	0				0
Level 2 | Residential, Term, Financing Receivable
Residential [Abstract]
Loans	0				990
Level 2 | Residential, Construction, Financing Receivables
Residential [Abstract]
Loans	0				0
Level 3
Financial assets
Cash and cash equivalents	0				0
Interest-bearing deposits in other banks	0				0
Securities available for sale	0				0
Securities to be held to maturity, fair value	0				0
Restricted equity securities, at cost	0				0
Loans held for sale	0				0
Commercial [Abstract]
Municipal	20,331				20,833
Residential [Abstract]
Home equity line of credit	107,419				101,245
Consumer	23,754				19,207
Total loans	978,008				910,146
Mortgage servicing rights	0				0
Accrued interest receivable	0				0
Financial liabilities
Demand deposits	0				0
NOW deposits	0				0
Money market deposits	0				0
Savings deposits	0				0
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Accrued interest payable	0				0
Level 3 | Commercial Real Estate
Commercial [Abstract]
Loans	262,763				235,937
Level 3 | Commercial Construction
Commercial [Abstract]
Loans	23,906				29,733
Level 3 | Commercial Other Receivable
Commercial [Abstract]
Loans	126,141				102,858
Level 3 | Residential, Term, Financing Receivable
Residential [Abstract]
Loans	405,315				388,210
Level 3 | Residential, Construction, Financing Receivables
Residential [Abstract]
Loans	8,379				12,123
Carrying Amount
Financial assets
Cash and cash equivalents	14,299				13,057
Interest-bearing deposits in other banks	4,013				3,559
Securities available for sale	223,039				185,261
Securities to be held to maturity, fair value	240,023				275,919
Restricted equity securities, at cost	14,257				13,912
Loans held for sale	349				0
Commercial [Abstract]
Municipal	19,730				20,406
Residential [Abstract]
Home equity line of credit	109,101				102,258
Consumer	23,822				19,007
Total loans	978,722				907,220
Mortgage servicing rights	1,093				1,086
Accrued interest receivable	4,912				4,748
Financial liabilities
Demand deposits	130,566				113,133
NOW deposits	242,638				199,977
Money market deposits	92,994				98,607
Savings deposits	206,009				165,601
Certificates of deposit	201,420				205,072
National certificates of deposit	169,562				242,429
Total deposits	1,043,189				1,024,819
Repurchase agreements	87,103				74,725
Federal Home Loan Bank advances	250,354				205,191
Total borrowed funds	337,457				279,916
Accrued interest payable	435				521
Carrying Amount | Commercial Real Estate
Commercial [Abstract]
Loans	265,616				238,104
Carrying Amount | Commercial Construction
Commercial [Abstract]
Loans	24,166				29,951
Carrying Amount | Commercial Other Receivable
Commercial [Abstract]
Loans	126,551				102,738
Carrying Amount | Residential, Term, Financing Receivable
Residential [Abstract]
Loans	401,315				382,620
Carrying Amount | Residential, Construction, Financing Receivables
Residential [Abstract]
Loans	8,421				12,136
Estimate of Fair Value
Financial assets
Cash and cash equivalents	14,299				13,057
Interest-bearing deposits in other banks	4,013				3,559
Securities available for sale	223,039				185,261
Securities to be held to maturity, fair value	243,123				279,704
Restricted equity securities, at cost	14,257				13,912
Loans held for sale	349				0
Commercial [Abstract]
Municipal	20,331				20,833
Residential [Abstract]
Home equity line of credit	108,118				101,733
Consumer	23,754				19,207
Total loans	978,707				912,055
Mortgage servicing rights	1,915				2,088
Accrued interest receivable	4,912				4,748
Financial liabilities
Demand deposits	125,651				109,973
NOW deposits	224,627				186,490
Money market deposits	82,050				83,837
Savings deposits	181,010				146,936
Certificates of deposit	201,013				205,360
National certificates of deposit	169,617				242,824
Total deposits	983,968				975,420
Repurchase agreements	82,168				70,783
Federal Home Loan Bank advances	250,027				208,259
Total borrowed funds	332,195				279,042
Accrued interest payable	435				521
Estimate of Fair Value | Commercial Real Estate
Commercial [Abstract]
Loans	262,763				236,368
Estimate of Fair Value | Commercial Construction
Commercial [Abstract]
Loans	23,906				29,733
Estimate of Fair Value | Commercial Other Receivable
Commercial [Abstract]
Loans	126,141				102,858
Estimate of Fair Value | Residential, Term, Financing Receivable
Residential [Abstract]
Loans	405,315				389,200
Estimate of Fair Value | Residential, Construction, Financing Receivables
Residential [Abstract]
Loans	$ 8,379				$ 12,123

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- Definition

Represents the portion of the balance sheet assertion valued at fair value whether such amount is presented as a separate caption or as a parenthetical disclosure. Element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. May be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on an entity's books for accrued interest receivable.

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Amount of stock held at Federal Home Loan Bank and Federal Reserve Bank. Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank Stock represents an equity interest in a FHLB of FRB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Fair value portion of accrued expenses.

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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