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Investment Securities - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Investment Securities [Line Items] | |||
| Other-than-temporary impairment charge | $ 0 | $ 292,000 | |
| Impairment charges on securities in continuous unrealized loss position for 12 months or longer | 0 | 0 | |
| Net realized gain (loss) on redemption or sale of investment securities | 1,039,000 | 1,397,000 | 1,635,000 |
| Recognized in earnings resulting from the redemption of investment securities | 3,300,000 | 1,700,000 | |
| Investment securities available-for- sale, carrying values | 530,926,000 | 451,060,000 | |
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Securities Pledged as Collateral [Member]
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| Investment Securities [Line Items] | |||
| Investment securities available-for- sale, carrying values | $ 47,600,000 | $ 18,200,000 | |
| X | ||||||||||
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- Definition
Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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