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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, carrying value	$ 21,056	$ 19,207	$ 20,189	$ 17,366
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities to be held to maturity, carrying value	260,077	256,567	244,123
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale, carrying value	481	386	865
Mortgage servicing rights	2,581	2,321	1,888
Demand deposits	146,964	145,332	137,061
NOW deposits	282,449	318,043	293,553
Money market deposits	100,378	163,898	134,760
Savings deposits	229,464	232,605	226,391
Total deposits	1,416,646	1,418,879	1,319,259
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, carrying value	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity, carrying value	260,077	256,567	244,123
Restricted equity securities	12,363	10,358	12,311
Loans held for sale, carrying value	481	386	865
Loans	1,212,968	1,153,410	1,110,054
Mortgage servicing rights, carrying value	1,285	1,268	1,109
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	146,964	145,332	137,061
NOW deposits	282,449	318,043	293,553
Money market deposits	100,378	163,898	134,760
Savings deposits	229,464	232,605	226,391
Local certificates of deposit	267,932	223,074	217,495
National certificates of deposit	389,459	335,927	309,999
Total deposits	1,416,646	1,418,879	1,319,259
Repurchase agreements	91,764	70,564	67,154
Federal Home Loan Bank advances	205,691	158,194	215,123
Total borrowed funds	297,455	228,758	282,277
Accrued interest payable	943	642	603
Carrying value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	345,853	319,691	301,722
Carrying value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,852	37,594	32,989
Carrying value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	180,750	177,956	171,099
Carrying value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	48,693	33,370	28,672
Carrying value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,550	17,830	15,025
Carrying value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	452,289	431,459	425,985
Carrying value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	106,892	110,566	109,516
Carrying value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	24,089	24,944	25,046
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale	481	386	865
Loans	1,188,573	1,138,727	1,102,089
Mortgage servicing rights	2,581	2,321	1,888
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	136,167	139,350	133,002
NOW deposits	254,619	295,775	274,476
Money market deposits	93,978	153,497	126,402
Savings deposits	194,141	203,799	200,712
Local certificates of deposit	263,342	220,734	217,021
National certificates of deposit	389,062	335,775	309,853
Total deposits	1,331,309	1,348,930	1,261,466
Repurchase agreements	88,560	67,976	64,852
Federal Home Loan Bank advances	204,476	156,396	214,893
Total borrowed funds	293,036	224,372	279,745
Accrued interest payable	943	642	603
Total Fair Value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	338,784	311,321	295,339
Total Fair Value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,037	36,610	32,291
Total Fair Value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	178,904	175,455	169,509
Total Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	47,790	33,280	28,902
Total Fair Value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,443	17,613	14,983
Total Fair Value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	441,029	431,028	428,556
Total Fair Value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	105,264	109,012	107,855
Total Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	23,322	24,408	24,654
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		0	0
Securities available for sale	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	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
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale	481	386	865
Loans	6,387	6,521	269
Mortgage servicing rights	2,581	2,321	1,888
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	136,167	139,350	133,002
NOW deposits	254,619	295,775	274,476
Money market deposits	93,978	153,497	126,402
Savings deposits	194,141	203,799	200,712
Local certificates of deposit	263,342	220,734	217,021
National certificates of deposit	389,062	335,775	309,853
Total deposits	1,331,309	1,348,930	1,261,466
Repurchase agreements	88,560	67,976	64,852
Federal Home Loan Bank advances	204,476	156,396	214,893
Total borrowed funds	293,036	224,372	279,745
Accrued interest payable	943	642	603
Total Fair Value | Level 2 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	423	72	0
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	5,527	6,018	33
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	339	391	236
Total Fair Value | Level 2 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	98	40	0
Total Fair Value | Level 2 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
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
Fair Value (Estimated)		0	0
Securities available for sale	0
Securities to be held to maturity	0	0	0
Restricted equity securities	0	0	0
Loans held for sale	0	0	0
Loans	1,182,186	1,132,206	1,101,820
Mortgage servicing rights	0	0	0
Interest rate swap agreements	0	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	338,361	311,249	295,339
Total Fair Value | Level 3 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,037	36,610	32,291
Total Fair Value | Level 3 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	173,377	169,437	169,476
Total Fair Value | Level 3 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	47,790	33,280	28,902
Total Fair Value | Level 3 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,443	17,613	14,983
Total Fair Value | Level 3 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	440,690	430,637	428,320
Total Fair Value | Level 3 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	105,166	108,972	107,855
Total Fair Value | Level 3 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 23,322	$ 24,408	$ 24,654

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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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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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