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Loans and Allowance for Loan Losses - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Segment | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of portfolio segments | Segment | 8 |  |
Loans on which the accrual of interest has been discontinued | $ 4,222,000 | $ 4,826,000 |
Accrued interest on loans | 40,000 | 100,000 |
Interest income recorded | $ 300,000 | 200,000 |
Trouble Debt restructuring Modified period term | 6 months |  |
Period of repayment performance under the modified loan terms | 6 months |  |
Non-accruing loans restructured and remained on nonaccrual status | $ 700,000 |  | $ 4,300,000
Repayments of loans | 0 | 0 |
Allowance for loans losses | 1,000 | 900,000 |
Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructuring evaluated impairment | 0 |  |
Allowance for loans losses | 0 |  |
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan amount threshold for impairment analysis | 500,000 |  |
Troubled debt restructuring evaluated impairment | 500,000 | 500,000 |
Related Party Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Related party loans and commitments | 3,000,000 | 3,100,000 |
New loans to parties | 0 | 0 |
Repayments of loan | $ 100,000 | $ 500,000 |
Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of loan portfolio | 59.90% | 68.50% |

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