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Commitments and Contingencies (Details) (USD $)
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9 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
Commitments to extend credit
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Dec. 31, 2013
Commitments to extend credit
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Sep. 30, 2014
Standby letters of credit
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Dec. 31, 2013
Standby letters of credit
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Sep. 30, 2014
Standby letters of credit
Minimum
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Sep. 30, 2014
Standby letters of credit
Maximum
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Sep. 30, 2014
Unadvanced Commitment on Impaired Loan
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Dec. 31, 2013
Unadvanced Commitment on Impaired Loan
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Sep. 30, 2014
Fixed Rate Loan Commitment
Commitments to extend credit
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Dec. 31, 2013
Fixed Rate Loan Commitment
Commitments to extend credit
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| Schedule of Commitments [Line Items] | ||||||||||
| Commitment to lend | $ 0 | $ 100,000 | ||||||||
| Estimated losses attributable to unadvanced commitments on impaired loans | 200,000 | 200,000 | ||||||||
| Off-balance sheet financial instruments, contractual amounts | $ 879,258,000 | $ 804,420,000 | $ 45,791,000 | $ 44,376,000 | $ 66,400,000 | $ 50,300,000 | ||||
| Remaing term of letters of credit | 1 month | 3 years 4 months 24 days | ||||||||