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Commitments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule of Commitments [Line Items]
Unadvanced commitments on impaired loans		$ 0
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 1,272,570	1,298,423
Letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 54,647	73,790
Letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	3 years 6 months
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	$ 400	350
Fixed Rate Loan Commitment | Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 103,400	$ 112,000

X

- Definition

Contractual Amounts Of Off Balance Sheet Financial Instruments

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Remaining Term

+ References

No definition available.

+ Details

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- Definition

Loans and Leases Receivable, Impaired Loans, Commitment to Lend, Reserve

+ References

No definition available.

+ Details

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- Definition

Schedule of Commitments [Line Items]

+ References

No definition available.

+ Details

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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=82895541&loc=d3e18794-111554

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