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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 plaintiff complaint | Dec. 31, 2013
Loss Contingencies [Line Items] |  |
Notional amount of financial standby letters of credit | $ 291,000 |
Notional amount of performance standby letters of credit | 800,000 |
Notional amount of commercial letters of credit | 172,000 |
Financial instrument of credit risk | 100,000 | 100,000
Number of new complaints | 3 |
Loss Contingency, Number of Plaintiffs | 36 |
Unused commitments and letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Unfunded commitment liability | 2,900,000 | 3,200,000
Other Matters [Member] |  |
Loss Contingencies [Line Items] |  |
Contingency reserve | 100,000 | 800,000
Loss Contingency Paid | 400,000 |
Accrued Loss Contingency Relieved | 300,000 |
Other Matters [Member] | Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Number of customers affected (in customers) | 700 |
Other Matters [Member] | Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Number of customers affected (in customers) | 900 |
Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Percentage Of Interest Rate On Deposits | 3.50% |
Number of Former Plaintiffs | 34 |
Specified Average Age of Plaintiffs | 62 |
Original Plaintiff [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Damages Sought, Value | 500,000 |
Original Plaintiff's Adult Children [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Damages Sought, Value | 800,000 |
Jarrett [Member] | Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Number of Plaintiffs | 8 |
Young [Member] | Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Number of Plaintiffs | 12 |
Fisanik [Member] | Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Number of Plaintiffs | 14 |
Ira Market Rate For Savings Account [Member] | Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Percentage Of Interest Rate On Deposits | 8.00% |
Market Rate Savings Balance | $ 4,000,000 |

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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 + Details
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