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Investment Securities - Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract] |  |
Proceeds from sales | $ 671 | $ 0
Sales Transactions: |  |
Gross gains | 233 | 0
Gross losses | 0 | 0
Total gain (losses) from sales transactions | 233 | 0
Maturities and impairment |  |
Gross gains | 4 | 163
Gross losses | 0 | 0
Other-than-temporary impairment | 0 | 0
Total gain (losses) maturities and impairment | 4 | 163
Net gains and impairment | $ 237 | $ 163

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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