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Investment Securities - Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Security | Dec. 31, 2012 Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | $ 1,272 | $ 638
Available for Sale Within One Year, Estimated Fair Value | 112,789 | 85,291
Available for Sale Within One Year, Number of Securities | 42 | 33
Available for Sale More than One Year, Gross Unrealized Loss | 240 | 301
Available for Sale More than One Year, Estimated Fair Value | 12,212 | 13,655
Available for Sale More than One Year, Number of Securities | 5 | 7
Available-for-sale Securities, Gross Unrealized Loss, Total | 1,512 | 939
Available for Sale, Estimated Fair Value | 125,001 | 98,946
Available for Sale, Number of Securities | 47 | 40
Mortgage-Backed Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 503 | 186
Available for Sale Within One Year, Estimated Fair Value | 35,523 | 28,354
Available for Sale Within One Year, Number of Securities | 12 | 10
Available-for-sale Securities, Gross Unrealized Loss, Total | 503 | 186
Available for Sale, Estimated Fair Value | 35,523 | 28,354
Available for Sale, Number of Securities | 12 | 10
Collateralized Mortgage Obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 185 | 109
Available for Sale Within One Year, Estimated Fair Value | 18,076 | 14,344
Available for Sale Within One Year, Number of Securities | 7 | 5
Available-for-sale Securities, Gross Unrealized Loss, Total | 185 | 109
Available for Sale, Estimated Fair Value | 18,076 | 14,344
Available for Sale, Number of Securities | 7 | 5
U.S. Government Agency Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 177 | 94
Available for Sale Within One Year, Estimated Fair Value | 35,799 | 26,894
Available for Sale Within One Year, Number of Securities | 12 | 9
Available-for-sale Securities, Gross Unrealized Loss, Total | 177 | 94
Available for Sale, Estimated Fair Value | 35,799 | 26,894
Available for Sale, Number of Securities | 12 | 9
Municipal Bonds-Taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 124 | 126
Available for Sale Within One Year, Estimated Fair Value | 4,577 | 4,587
Available for Sale Within One Year, Number of Securities | 4 | 4
Available for Sale More than One Year, Gross Unrealized Loss | 3 | 9
Available for Sale More than One Year, Estimated Fair Value | 464 | 1,964
Available for Sale More than One Year, Number of Securities | 1 | 3
Available-for-sale Securities, Gross Unrealized Loss, Total | 127 | 135
Available for Sale, Estimated Fair Value | 5,041 | 6,551
Available for Sale, Number of Securities | 5 | 7
Corporate Bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 116 |
Available for Sale Within One Year, Estimated Fair Value | 4,871 |
Available for Sale Within One Year, Number of Securities | 1 |
Available for Sale More than One Year, Gross Unrealized Loss | 185 | 246
Available for Sale More than One Year, Estimated Fair Value | 10,801 | 10,738
Available for Sale More than One Year, Number of Securities | 3 | 3
Available-for-sale Securities, Gross Unrealized Loss, Total | 301 | 246
Available for Sale, Estimated Fair Value | 15,672 | 10,738
Available for Sale, Number of Securities | 4 | 3
SBA Loan Pool Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 166 | 82
Available for Sale Within One Year, Estimated Fair Value | 13,918 | 11,004
Available for Sale Within One Year, Number of Securities | 4 | 3
Available-for-sale Securities, Gross Unrealized Loss, Total | 166 | 82
Available for Sale, Estimated Fair Value | 13,918 | 11,004
Available for Sale, Number of Securities | 4 | 3
Other Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 1 | 1
Available for Sale Within One Year, Estimated Fair Value | 25 | 12
Available for Sale Within One Year, Number of Securities | 2 | 1
Available for Sale More than One Year, Gross Unrealized Loss | 52 | 46
Available for Sale More than One Year, Estimated Fair Value | 947 | 953
Available for Sale More than One Year, Number of Securities | 1 | 1
Available-for-sale Securities, Gross Unrealized Loss, Total | 53 | 47
Available for Sale, Estimated Fair Value | 972 | 965
Available for Sale, Number of Securities | 3 | 2
Equity Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss |  | 40
Available for Sale Within One Year, Estimated Fair Value |  | 96
Available for Sale Within One Year, Number of Securities |  | 1
Available-for-sale Securities, Gross Unrealized Loss, Total |  | 40
Available for Sale, Estimated Fair Value |  | $ 96
Available for Sale, Number of Securities |  | 1

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -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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