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Investment Securities - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) security state | Dec. 31, 2016 USD ($) security | Sep. 30, 2014 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |
Securities pledged as collateral | $ 231,516,000 | $ 222,328,000 |
Number of securities temporarily impaired (security) | security | 241 | 299 |
Number of securities temporarily impaired for 12 months or more (security) | security | 157 | 15 |
Period of temporary impairment | 12 months | 12 months |
Amortized cost of securities transferred |  |  | $ 89,780,000
Fair value of securities transferred |  |  | 89,757,000
Net unrealized losses on securities transferred |  |  | $ 15,000
Net unrealized loss on securities transferred from available for sale to held to maturity | $ 174,000 | $ 129,000 |
Number of states | state | 6 |  |
FHLB stock | $ 9,321,000 | 10,893,000 |
Impairment losses | $ 0 | $ 0 |

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- Definition Available-for-sale Securities, Transferred to Held-to-maturity Securities, Accumulated Unrealized Gain (Loss) + References No definition available. + Details
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- Definition The number of securities with unrealized losses, classified as temporarily impaired, held in a Company's portfolio as of the balance sheet date. + References No definition available. + Details
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- Definition The number of States in New England where Federal Home Loan Bank do housing and financing services. + References No definition available. + Details
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- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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