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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | $ 22,375 | $ 17,366 | $ 23,456 | $ 14,299
Interest bearing deposits in other banks | 584 | 293 | 15,098 |
Securities available for sale | 298,999 | 300,416 | 282,293 |
Securities to be held to maturity | 242,679 | 226,828 | 188,770 |
Securities to be held to maturity | 245,021 | 225,537 | 195,797 |
Restricted equity securities | 10,798 | 11,930 | 14,048 |
Loans held for sale | 434 | 782 | 1,228 |
Mortgage servicing rights | 1,888 | 1,696 | 1,683 |
Demand deposits | 193,089 | 140,482 | 158,476 |
NOW deposits | 291,403 | 282,971 | 295,708 |
Money market deposits | 134,257 | 125,544 | 76,685 |
Savings deposits | 234,456 | 217,340 | 218,425 |
Total deposits | 1,350,049 | 1,242,957 | 1,173,749 |
Carrying value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 22,375 | 17,366 | 23,456 |
Interest bearing deposits in other banks | 584 | 293 | 15,098 |
Securities available for sale | 298,999 | 300,416 | 282,293 |
Securities to be held to maturity | 242,679 | 226,828 | 188,770 |
Restricted equity securities | 10,798 | 11,930 | 14,048 |
Loans held for sale | 434 | 782 | 1,228 |
Loans | 1,110,074 | 1,061,388 | 1,018,694 |
Mortgage servicing rights | 1,109 | 1,113 | 1,071 |
Interest rate swap agreements | 1,592 | 1,790 | 90 |
Accrued interest receivable | 5,820 | 5,532 | 5,079 |
Demand deposits | 193,089 | 140,482 | 158,476 |
NOW deposits | 291,403 | 282,971 | 295,708 |
Money market deposits | 134,257 | 125,544 | 76,685 |
Savings deposits | 234,456 | 217,340 | 218,425 |
Local certificates of deposit | 220,702 | 210,316 | 211,402 |
National certificates of deposit | 276,142 | 266,304 | 213,053 |
Total deposits | 1,350,049 | 1,242,957 | 1,173,749 |
Repurchase agreements | 75,412 | 84,174 | 87,970 |
Federal Home Loan Bank advances | 158,916 | 194,727 | 180,128 |
Total borrowed funds | 234,328 | 278,901 | 268,098 |
Accrued interest payable | 605 | 479 | 508 |
Carrying value | Commercial | Real estate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 296,888 | 297,952 | 293,167 |
Carrying value | Commercial | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 32,348 | 24,954 | 18,452 |
Carrying value | Commercial | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 169,493 | 148,737 | 129,258 |
Carrying value | Municipal |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 33,289 | 27,035 | 26,132 |
Carrying value | Residential | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 15,461 | 18,253 | 14,226 |
Carrying value | Residential | Term |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 428,318 | 409,999 | 401,597 |
Carrying value | Home equity line of credit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 109,433 | 109,986 | 110,989 |
Carrying value | Consumer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 24,844 | 24,472 | 24,873 |
Total Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 22,375 | 17,366 | 23,456 |
Interest bearing deposits in other banks | 584 | 293 | 15,098 |
Securities available for sale | 298,999 | 300,416 | 282,293 |
Securities to be held to maturity | 245,021 | 225,537 | 195,797 |
Restricted equity securities | 10,798 | 11,930 | 14,048 |
Loans held for sale | 434 | 782 | 1,228 |
Loans | 1,102,026 | 1,053,814 | 1,022,649 |
Mortgage servicing rights | 1,888 | 1,696 | 1,683 |
Interest rate swap agreements | 1,592 | 1,790 | 90 |
Accrued interest receivable | 5,820 | 5,532 | 5,079 |
Demand deposits | 187,310 | 133,342 | 163,498 |
NOW deposits | 274,629 | 259,418 | 296,393 |
Money market deposits | 126,541 | 115,087 | 71,714 |
Savings deposits | 207,813 | 188,260 | 206,331 |
Local certificates of deposit | 220,047 | 209,370 | 213,622 |
National certificates of deposit | 276,078 | 266,372 | 213,332 |
Total deposits | 1,292,418 | 1,171,849 | 1,164,890 |
Repurchase agreements | 72,948 | 79,827 | 87,246 |
Federal Home Loan Bank advances | 158,424 | 193,733 | 181,918 |
Total borrowed funds | 231,372 | 273,560 | 269,164 |
Accrued interest payable | 605 | 479 | 508 |
Total Fair Value | Commercial | Real estate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 290,475 | 293,103 | 289,015 |
Total Fair Value | Commercial | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 31,649 | 24,548 | 18,191 |
Total Fair Value | Commercial | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 167,710 | 147,394 | 129,143 |
Total Fair Value | Municipal |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 33,466 | 27,446 | 27,270 |
Total Fair Value | Residential | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 15,307 | 18,125 | 14,170 |
Total Fair Value | Residential | Term |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 431,112 | 410,327 | 409,916 |
Total Fair Value | Home equity line of credit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 107,891 | 108,740 | 110,220 |
Total Fair Value | Consumer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 24,416 | 24,131 | 24,724 |
Total Fair Value | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 22,375 | 17,366 | 23,456 |
Interest bearing deposits in other banks | 584 | 293 | 15,098 |
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 | 298,999 | 300,416 | 282,293 |
Securities to be held to maturity | 245,021 | 225,537 | 195,797 |
Restricted equity securities | 10,798 | 11,930 | 14,048 |
Loans held for sale | 434 | 782 | 1,228 |
Loans | 7,334 | 827 | 1,311 |
Mortgage servicing rights | 1,888 | 1,696 | 1,683 |
Interest rate swap agreements | 1,592 | 1,790 | 90 |
Accrued interest receivable | 5,820 | 5,532 | 5,079 |
Demand deposits | 187,310 | 133,342 | 163,498 |
NOW deposits | 274,629 | 259,418 | 296,393 |
Money market deposits | 126,541 | 115,087 | 71,714 |
Savings deposits | 207,813 | 188,260 | 206,331 |
Local certificates of deposit | 220,047 | 209,370 | 213,622 |
National certificates of deposit | 276,078 | 266,372 | 213,332 |
Total deposits | 1,292,418 | 1,171,849 | 1,164,890 |
Repurchase agreements | 72,948 | 79,827 | 87,246 |
Federal Home Loan Bank advances | 158,424 | 193,733 | 181,918 |
Total borrowed funds | 231,372 | 273,560 | 269,164 |
Accrued interest payable | 605 | 479 | 508 |
Total Fair Value | Level 2 | Commercial | Real estate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 351 | 558 | 544 |
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 | 6,259 | 33 | 0 |
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 | 724 | 236 | 703 |
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 |
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 | 1,094,692 | 1,052,987 | 1,021,338 |
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 | 290,124 | 292,545 | 288,471 |
Total Fair Value | Level 3 | Commercial | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 31,649 | 24,548 | 18,191 |
Total Fair Value | Level 3 | Commercial | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 161,451 | 147,361 | 129,143 |
Total Fair Value | Level 3 | Municipal |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 33,466 | 27,446 | 27,270 |
Total Fair Value | Level 3 | Residential | Construction |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 15,307 | 18,125 | 14,170 |
Total Fair Value | Level 3 | Residential | Term |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 430,388 | 410,091 | 409,213 |
Total Fair Value | Level 3 | Home equity line of credit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | 107,891 | 108,740 | 110,220 |
Total Fair Value | Level 3 | Consumer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans | $ 24,416 | $ 24,131 | $ 24,660 |

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. + References No definition available. + Details
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- Definition 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). + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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