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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 20,189,000	$ 17,366,000	$ 20,838,000	$ 14,299,000
Interest bearing deposits in other banks	3,820,000	293,000	7,568,000
Securities available for sale	308,146,000	300,416,000	241,327,000
Securities to be held to maturity	244,123,000	226,828,000	216,272,000
Securities to be held to maturity	246,238,000	225,537,000	225,200,000
Restricted equity securities	12,311,000	11,930,000	14,441,000
Loans held for sale	865,000	782,000	1,553,000
Mortgage servicing rights	1,888,000	1,696,000	1,489,000
Demand deposits	180,298,000	140,482,000	130,168,000
NOW deposits	250,316,000	282,971,000	254,136,000
Money market deposits	134,760,000	125,544,000	73,030,000
Savings deposits	226,391,000	217,340,000	208,826,000
Total deposits	1,319,259,000	1,242,957,000	1,145,709,000
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	20,189,000	17,366,000	20,838,000
Interest bearing deposits in other banks	3,820,000	293,000	7,568,000
Securities available for sale	308,146,000	300,416,000	241,327,000
Securities to be held to maturity	244,123,000	226,828,000	216,272,000
Restricted equity securities	12,311,000	11,930,000	14,441,000
Loans held for sale	865,000	782,000	1,553,000
Loans	1,110,054,000	1,061,388,000	1,028,015,000
Mortgage servicing rights	1,109,000	1,113,000	948,000
Interest rate swap agreements	1,623,000	1,790,000
Accrued interest receivable	7,192,000	5,532,000	6,372,000
Demand deposits	180,298,000	140,482,000	130,168,000
NOW deposits	250,316,000	282,971,000	254,136,000
Money market deposits	134,760,000	125,544,000	73,030,000
Savings deposits	226,391,000	217,340,000	208,826,000
Local certificates of deposit	217,495,000	210,316,000	211,006,000
National certificates of deposit	309,999,000	266,304,000	268,543,000
Total deposits	1,319,259,000	1,242,957,000	1,145,709,000
Repurchase agreements	67,154,000	84,174,000	82,965,000
Federal Home Loan Bank advances	215,123,000	194,727,000	200,130,000
Total borrowed funds	282,277,000	278,901,000	283,095,000
Interest rate swap agreements			208,000
Accrued interest payable	603,000	479,000	499,000
Carrying value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	301,722,000	297,952,000	298,822,000
Carrying value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	32,989,000	24,954,000	18,078,000
Carrying value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	171,099,000	148,737,000	134,632,000
Carrying value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	28,672,000	27,035,000	25,512,000
Carrying value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	15,025,000	18,253,000	13,364,000
Carrying value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	425,985,000	409,999,000	401,911,000
Carrying value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	109,516,000	109,986,000	111,537,000
Carrying value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	25,046,000	24,472,000	24,159,000
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	20,189,000	17,366,000	20,838,000
Interest bearing deposits in other banks	3,820,000	293,000	7,568,000
Securities available for sale	308,146,000	300,416,000	241,327,000
Securities to be held to maturity	246,238,000	225,537,000	225,200,000
Restricted equity securities	12,311,000	11,930,000	14,441,000
Loans held for sale	865,000	782,000	1,553,000
Loans	1,102,089,000	1,053,814,000	1,032,533,000
Mortgage servicing rights	1,888,000	1,696,000	1,489,000
Interest rate swap agreements	1,623,000	1,790,000
Accrued interest receivable	7,192,000	5,532,000	6,372,000
Demand deposits	174,958,000	133,342,000	134,043,000
NOW deposits	234,049,000	259,418,000	253,251,000
Money market deposits	126,402,000	115,087,000	68,204,000
Savings deposits	200,712,000	188,260,000	196,812,000
Local certificates of deposit	217,021,000	209,370,000	213,726,000
National certificates of deposit	309,853,000	266,372,000	268,873,000
Total deposits	1,262,995,000	1,171,849,000	1,134,909,000
Repurchase agreements	64,852,000	79,827,000	81,775,000
Federal Home Loan Bank advances	214,893,000	193,733,000	202,184,000
Total borrowed funds	279,745,000	273,560,000	283,959,000
Interest rate swap agreements			208,000
Accrued interest payable	603,000	479,000	499,000
Total Fair Value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	295,339,000	293,103,000	294,749,000
Total Fair Value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	32,291,000	24,548,000	17,832,000
Total Fair Value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	169,509,000	147,394,000	134,567,000
Total Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	28,902,000	27,446,000	26,833,000
Total Fair Value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,983,000	18,125,000	13,289,000
Total Fair Value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	428,556,000	410,327,000	410,502,000
Total Fair Value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	107,855,000	108,740,000	110,635,000
Total Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	24,654,000	24,131,000	24,126,000
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	20,189,000	17,366,000	20,838,000
Interest bearing deposits in other banks	3,820,000	293,000	7,568,000
Securities available for sale	0	0	0
Securities to be held to maturity	0	0	0
Restricted equity securities	0	0	0
Loans held for sale	0	0	0
Loans	0	0	0
Mortgage servicing rights	0	0	0
Interest rate swap agreements	0	0
Accrued interest receivable	0	0	0
Demand deposits	0	0	0
NOW deposits	0	0	0
Money market deposits	0	0	0
Savings deposits	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	0	0	0
Accrued interest payable	0	0	0
Total Fair Value | Level 1 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0	0
Interest bearing deposits in other banks	0	0	0
Securities available for sale	308,146,000	300,416,000	241,327,000
Securities to be held to maturity	246,238,000	225,537,000	225,200,000
Restricted equity securities	12,311,000	11,930,000	14,441,000
Loans held for sale	865,000	782,000	1,553,000
Loans	269,000	827,000	1,889,000
Mortgage servicing rights	1,888,000	1,696,000	1,489,000
Interest rate swap agreements	1,623,000	1,790,000
Accrued interest receivable	7,192,000	5,532,000	6,372,000
Demand deposits	174,958,000	133,342,000	134,043,000
NOW deposits	234,049,000	259,418,000	253,251,000
Money market deposits	126,402,000	115,087,000	68,204,000
Savings deposits	200,712,000	188,260,000	196,812,000
Local certificates of deposit	217,021,000	209,370,000	213,726,000
National certificates of deposit	309,853,000	266,372,000	268,873,000
Total deposits	1,262,995,000	1,171,849,000	1,134,909,000
Repurchase agreements	64,852,000	79,827,000	81,775,000
Federal Home Loan Bank advances	214,893,000	193,733,000	202,184,000
Total borrowed funds	279,745,000	273,560,000	283,959,000
Interest rate swap agreements			208,000
Accrued interest payable	603,000	479,000	499,000
Total Fair Value | Level 2 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	558,000	544,000
Total Fair Value | Level 2 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	33,000	33,000	348,000
Total Fair Value | Level 2 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	236,000	236,000	933,000
Total Fair Value | Level 2 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	64,000
Total Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0	0
Interest bearing deposits in other banks	0	0	0
Securities available for sale	0	0	0
Securities to be held to maturity	0	0	0
Restricted equity securities	0	0	0
Loans held for sale	0	0	0
Loans	1,101,820,000	1,052,987,000	1,030,644,000
Mortgage servicing rights	0	0	0
Interest rate swap agreements	0	0
Accrued interest receivable	0	0	0
Demand deposits	0	0	0
NOW deposits	0	0	0
Money market deposits	0	0	0
Savings deposits	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	0	0	0
Accrued interest payable	0	0	0
Total Fair Value | Level 3 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	295,339,000	292,545,000	294,205,000
Total Fair Value | Level 3 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	32,291,000	24,548,000	17,832,000
Total Fair Value | Level 3 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	169,476,000	147,361,000	134,219,000
Total Fair Value | Level 3 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	28,902,000	27,446,000	26,833,000
Total Fair Value | Level 3 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,983,000	18,125,000	13,289,000
Total Fair Value | Level 3 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	428,320,000	410,091,000	409,569,000
Total Fair Value | Level 3 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	107,855,000	108,740,000	110,635,000
Total Fair Value | Level 3 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 24,654,000	$ 24,131,000	$ 24,062,000

X

- 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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The aggregate amount of local time deposits, including certificates of deposits, individual retirement accounts and open accounts.

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The aggregate amount of national time deposits, including certificates of deposits, individual retirement accounts and open accounts.

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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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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

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Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

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