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Commitments and Contingencies (Details) (USD $)
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9 Months Ended | |||||||||||
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Sep. 30, 2013
charge_count
Plantiff
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Sep. 30, 2013
Maximum
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Sep. 30, 2013
Minimum
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Sep. 30, 2013
Roseman v. Martin Sigillito
Minimum
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Sep. 30, 2013
Commitments to extend credit
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Dec. 31, 2012
Commitments to extend credit
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Sep. 30, 2013
Standby letters of credit
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Dec. 31, 2012
Standby letters of credit
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Sep. 30, 2013
Unadvanced Commitment on Impaired Loan
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Dec. 31, 2012
Unadvanced Commitment on Impaired Loan
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Sep. 30, 2013
Fixed Rate Loan Commitment
Commitments to extend credit
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Dec. 31, 2012
Fixed Rate Loan Commitment
Commitments to extend credit
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| Schedule of Commitments [Line Items] | ||||||||||||
| Remaing Term of Letters Of Credit | 5 years | 6 months | ||||||||||
| Loans and Leases Receivable, Impaired Loans, Commitment to Lend | $ 1,724,000 | $ 775,000 | ||||||||||
| Estimated losses attributable to unadvanced commitments on impaired loans | 241,000 | 124,000 | ||||||||||
| Off-balance sheet financial instruments, contractual amounts | 769,704,000 | 722,325,000 | 43,452,000 | 42,561,000 | 38,600,000 | 50,700,000 | ||||||
| Loss contingency, damages sought, value | $ 44,000,000 | |||||||||||
| Number of counts found guilty | 20 | |||||||||||
| Number of lawsuits, bank as defendant | 41 | |||||||||||