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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Financial assets
Securities available for sale	$ 300,416				$ 223,039
Securities to be held to maturity, fair value	225,537				243,123
Restricted equity securities, at cost	11,930				14,257
Loans (net of allowance for loan losses) [Abstract]
Mortgage servicing rights	1,696				1,915
Financial liabilities
Demand deposits	140,482				130,566
NOW deposits	282,971				242,638
Money market deposits	125,544				92,994
Savings deposits	217,340				206,009
Certificates of deposit	476,620				370,982
Total deposits	1,242,957	$ 1,173,749	$ 1,145,709	$ 1,109,441	1,043,189	$ 1,058,365	$ 1,096,323	$ 966,825
Level 1
Financial assets
Cash and cash equivalents	17,366				14,299
Interest-bearing deposits in other banks	293				4,013
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
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Mortgage servicing rights	0				0
Interest rate swap agreements	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
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Commercial | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Commercial | Other
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Municipal
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Residential | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Residential | Term
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Home Equity LIne of Credit
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 1 | Consumer
Loans (net of allowance for loan losses) [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	300,416				223,039
Securities to be held to maturity, fair value	225,537				243,123
Restricted equity securities, at cost	11,930				14,257
Loans held for sale	782				349
Loans (net of allowance for loan losses) [Abstract]
Loans	827				699
Mortgage servicing rights	1,696				1,915
Interest rate swap agreements	1,790
Accrued interest receivable	5,532				4,912
Financial liabilities
Demand deposits	133,342				125,651
NOW deposits	259,418				224,627
Money market deposits	115,087				82,050
Savings deposits	188,260				181,010
Certificates of deposit	209,370				201,013
National certificates of deposit	266,372				169,617
Total deposits	1,171,849				983,968
Repurchase agreements	79,827				82,168
Federal Home Loan Bank advances	193,733				250,027
Total borrowed funds	273,560				332,195
Accrued interest payable	479				435
Level 2 | Commercial | Real Estate
Loans (net of allowance for loan losses) [Abstract]
Loans	558				0
Level 2 | Commercial | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 2 | Commercial | Other
Loans (net of allowance for loan losses) [Abstract]
Loans	33				0
Level 2 | Municipal
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 2 | Residential | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	0				0
Level 2 | Residential | Term
Loans (net of allowance for loan losses) [Abstract]
Loans	236				0
Level 2 | Home Equity LIne of Credit
Loans (net of allowance for loan losses) [Abstract]
Loans	0				699
Level 2 | Consumer
Loans (net of allowance for loan losses) [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
Loans (net of allowance for loan losses) [Abstract]
Loans	1,052,987				978,008
Mortgage servicing rights	0				0
Interest rate swap agreements	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
Loans (net of allowance for loan losses) [Abstract]
Loans	292,545				262,763
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	24,548				23,906
Level 3 | Commercial | Other
Loans (net of allowance for loan losses) [Abstract]
Loans	147,361				126,141
Level 3 | Municipal
Loans (net of allowance for loan losses) [Abstract]
Loans	27,446				20,331
Level 3 | Residential | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	18,125				8,379
Level 3 | Residential | Term
Loans (net of allowance for loan losses) [Abstract]
Loans	410,091				405,315
Level 3 | Home Equity LIne of Credit
Loans (net of allowance for loan losses) [Abstract]
Loans	108,740				107,419
Level 3 | Consumer
Loans (net of allowance for loan losses) [Abstract]
Loans	24,131				23,754
Carrying Amount
Financial assets
Cash and cash equivalents	17,366				14,299
Interest-bearing deposits in other banks	293				4,013
Securities available for sale	300,416				223,039
Securities to be held to maturity, fair value	226,828				240,023
Restricted equity securities, at cost	11,930				14,257
Loans held for sale	782				349
Loans (net of allowance for loan losses) [Abstract]
Loans	1,061,388				978,722
Mortgage servicing rights	1,113				1,093
Interest rate swap agreements	1,790
Accrued interest receivable	5,532				4,912
Financial liabilities
Demand deposits	140,482				130,566
NOW deposits	282,971				242,638
Money market deposits	125,544				92,994
Savings deposits	217,340				206,009
Certificates of deposit	210,316				201,420
National certificates of deposit	266,304				169,562
Total deposits	1,242,957				1,043,189
Repurchase agreements	84,174				87,103
Federal Home Loan Bank advances	194,727				250,354
Total borrowed funds	278,901				337,457
Accrued interest payable	479				435
Carrying Amount | Commercial | Real Estate
Loans (net of allowance for loan losses) [Abstract]
Loans	297,952				265,616
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	24,954				24,166
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses) [Abstract]
Loans	148,737				126,551
Carrying Amount | Municipal
Loans (net of allowance for loan losses) [Abstract]
Loans	27,035				19,730
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	18,253				8,421
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses) [Abstract]
Loans	409,999				401,315
Carrying Amount | Home Equity LIne of Credit
Loans (net of allowance for loan losses) [Abstract]
Loans	109,986				109,101
Carrying Amount | Consumer
Loans (net of allowance for loan losses) [Abstract]
Loans	24,472				23,822
Estimate of Fair Value
Financial assets
Cash and cash equivalents	17,366				14,299
Interest-bearing deposits in other banks	293				4,013
Securities available for sale	300,416				223,039
Securities to be held to maturity, fair value	225,537				243,123
Restricted equity securities, at cost	11,930				14,257
Loans held for sale	782				349
Loans (net of allowance for loan losses) [Abstract]
Loans	1,053,814				978,707
Mortgage servicing rights	1,696				1,915
Interest rate swap agreements	1,790
Accrued interest receivable	5,532				4,912
Financial liabilities
Demand deposits	133,342				125,651
NOW deposits	259,418				224,627
Money market deposits	115,087				82,050
Savings deposits	188,260				181,010
Certificates of deposit	209,370				201,013
National certificates of deposit	266,372				169,617
Total deposits	1,171,849				983,968
Repurchase agreements	79,827				82,168
Federal Home Loan Bank advances	193,733				250,027
Total borrowed funds	273,560				332,195
Accrued interest payable	479				435
Estimate of Fair Value | Commercial | Real Estate
Loans (net of allowance for loan losses) [Abstract]
Loans	293,103				262,763
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	24,548				23,906
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses) [Abstract]
Loans	147,394				126,141
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses) [Abstract]
Loans	27,446				20,331
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses) [Abstract]
Loans	18,125				8,379
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses) [Abstract]
Loans	410,327				405,315
Estimate of Fair Value | Home Equity LIne of Credit
Loans (net of allowance for loan losses) [Abstract]
Loans	108,740				108,118
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses) [Abstract]
Loans	$ 24,131				$ 23,754

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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 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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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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+ References

No definition available.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of time deposit liabilities, including certificates of deposit.

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