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Commitments (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Schedule of Commitments [Line Items] |  |  |
Unadvanced commitments on impaired loans | $ 500 |  | $ 0
Commitments to extend credit |  |  |
Schedule of Commitments [Line Items] |  |  |
Off-balance sheet financial instruments, contractual amounts | 1,086,372 |  | 1,140,028
Standby letters of credit |  |  |
Schedule of Commitments [Line Items] |  |  |
Off-balance sheet financial instruments, contractual amounts | $ 64,360 |  | 54,648
Standby letters of credit | Maximum |  |  |
Schedule of Commitments [Line Items] |  |  |
Remaining term | 5 years |  |
Standby letters of credit | Minimum |  |  |
Schedule of Commitments [Line Items] |  |  |
Remaining term | 1 month |  |
Unadvanced Commitment on Impaired Loan |  |  |
Schedule of Commitments [Line Items] |  |  |
Estimated losses attributable to unadvanced commitments on impaired loans |  | $ 300 | 300
Fixed Rate Loan Commitment | Commitments to extend credit |  |  |
Schedule of Commitments [Line Items] |  |  |
Off-balance sheet financial instruments, contractual amounts | $ 107,500 |  | $ 93,900

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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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