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Non-performing Loans and Impaired Loans - Additional Information (Detail) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 Contract ConsecutivePayment | Dec. 31, 2013
Financing Receivable, Modifications [Line Items] |  |
Non-accrual loans | $ 10,828,000 | $ 9,748,000
Non-performing TDRs | 3,100,000 |
Loans acquired included in non-accrual loans | 1,300,000 |
Loans acquired included in non-performing TDRs | 362,000 |
Loan delinquency period | 90 days |
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status | 9 months |
Restructured loans with modified recorded balances | 0 |
Restructured loan returned to accruing status number of Consecutive Payments of loan | 6 |
Restructured loan reported in TDRs | 8,900,000 |
Specific reserves allocated to troubled debt restructuring | 1,500,000 |
Number TDRs returned to accrual status | 0 |
Loans classified as TDR after a period | 90 days |
Good Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating | 5 years |
Number of years of Satisfactory Relationship with bank for Good Pass Rating | 5 years |
Performing Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Restructured loan | 5,800,000 |
Minimum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loan delinquency period | 90 days |
Delay or shortfall in payments of loan | 30 days |
Loans with an aggregate credit exposure | 1,000,000 |
Minimum [Member] | Good Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of consecutive years of profit for Good Pass Rating | 3 years |
Minimum [Member] | Satisfactory Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating | 2 years |
Maximum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loans with an aggregate credit exposure | $ 2,500,000 |

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