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Investment Securities Additional Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) security state | Sep. 30, 2014 USD ($) security | Dec. 31, 2014 USD ($) security | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Available-for-sale Securities Pledged as Collateral | $ 221,072 | $ 181,441 | $ 164,919 |  |  |
Number of securities temporarily impaired | security | 88 | 76 | 56 |  |  |
Number of securities temporarily impaired | security | 14 | 47 | 36 |  |  |
Length of time securities temporarily impaired | 12 months | 12 months | 12 months |  |  |
Amortized cost of transferred securities from available-for-sale to held-to-maturity |  | $ 89,780 |  |  |  |
Fair value of transferred securities from available-for-sale to held-to-maturity |  | 89,757 |  |  |  |
Net unrealized loss, net of taxes on transferred securities |  | 15 |  |  |  |
Other comprehensive income (loss), unrealized loss on transferred securities | $ (99) | (28) | $ (48) | $ (84) | $ 0 | $ 0
Number of states in New England where FHLB serve | state | 6 |  |  |  |  |
Federal Home Loan Bank Stock | $ 12,875 | $ 12,875 | $ 12,875 |  |  |

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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 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=49124121&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=6478792&loc=d3e63345-112809 + Details
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