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Securities Available for Sale - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 Security | Sep. 30, 2013 | Sep. 30, 2014 Security | Sep. 30, 2013 | Dec. 31, 2013 Security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities held | 47 |  | 47 |  | 77
Gross gains on the sales of securities | $ 515,000 | $ 160,000 | $ 2,034,000 | $ 419,000 |
Gross losses on securities available for sale | 46,000 | 3,000 | 366,000 | 140,000 |
Securities with fair value | $ 252,630,000 |  | $ 252,630,000 |  | $ 241,911,000
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities held | 31 |  | 31 |  | 46
Securities held, less than 12 months category | 22 |  | 22 |  | 38
Unrealized loss for security |  |  | less than 12 months |  |
Securities held, more than 12 months category |  |  |  |  | 8
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member] | Maximum [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Unrealized loss for security |  |  | more than 12 months |  |
States and Political Subdivisions [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities held | 16 |  | 16 |  |
Securities held, less than 12 months category |  |  |  |  | 31
Unrealized loss for security |  |  | less than 12 months |  |
States and Political Subdivisions [Member] | Maximum [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Unrealized loss for security |  |  | more than 12 months |  |

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- Definition This item represents the gross profit 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
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