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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Unused commitments and letters of credit [Member] | Dec. 31, 2012 Unused commitments and letters of credit [Member] | Sep. 30, 2013 Pending Litigation [Member] Accountsholder | Sep. 30, 2013 Pending Litigation [Member] IRA Market Rate Savings Account [Member] | Sep. 30, 2013 Pending Litigation [Member] IRA Market Rate Savings Account [Member] Minimum [Member] | Sep. 30, 2013 Other Matters [Member] | Sep. 30, 2013 Other Matters [Member] Minimum [Member] customer | Sep. 30, 2013 Other Matters [Member] Maximum [Member] customer
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Specified Average Age Of Account Holders |  |  |  |  | 64 years |  |  |  |  |
Notional amount of financial standby letters of credit | $ 737,000 |  |  |  |  |  |  |  |  |
Notional amount of performance standby letters of credit | 1,200,000 |  |  |  |  |  |  |  |  |
Notional amount of commercial letters of credit | 0 |  |  |  |  |  |  |  |  |
Financial instrument of credit risk | 100,000 | 200,000 |  |  |  |  |  |  |  |
Unfunded commitment liability |  |  | 2,600,000 | 2,400,000 |  |  |  |  |  |
Percentage of interest rate on deposits |  |  |  |  |  | 3.50% | 8.00% |  |  |
Number of account holders of specified average age |  |  |  |  | 237 |  |  |  |  |
Savings deposits |  |  |  |  | 11,500,000 |  |  |  |  |
Number of customers affected (in customers) |  |  |  |  |  |  |  |  | 700 | 900
Contingency reserve |  |  |  |  |  |  |  | $ 800,000 |  |

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- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 6 -IssueDate 2006-05-01 -Chapter 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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