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Investment Securities - Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 Security | Dec. 31, 2012 Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | $ 4,301 | $ 638
Available for Sale Within One Year, Estimated Fair Value | 221,108 | 85,291
Available for Sale Within One Year, Number of Securities | 82 | 33
Available for Sale More than One Year, Gross Unrealized Loss | 254 | 301
Available for Sale More than One Year, Estimated Fair Value | 12,181 | 13,655
Available for Sale More than One Year, Number of Securities | 5 | 7
Available for Sale, Gross Unrealized Loss | 4,555 | 939
Available for Sale, Estimated Fair Value | 233,289 | 98,946
Available for Sale, Number of Securities | 87 | 40
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 1,871 | 186
Available for Sale Within One Year, Estimated Fair Value | 79,024 | 28,354
Available for Sale Within One Year, Number of Securities | 26 | 10
Available for Sale More than One Year, Gross Unrealized Loss |  |
Available for Sale More than One Year, Estimated Fair Value |  |
Available for Sale More than One Year, Number of Securities |  |
Available for Sale, Gross Unrealized Loss | 1,871 | 186
Available for Sale, Estimated Fair Value | 79,024 | 28,354
Available for Sale, Number of Securities | 26 | 10
Collateralized Mortgage Obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 521 | 109
Available for Sale Within One Year, Estimated Fair Value | 25,134 | 14,344
Available for Sale Within One Year, Number of Securities | 10 | 5
Available for Sale More than One Year, Gross Unrealized Loss |  |
Available for Sale More than One Year, Estimated Fair Value |  |
Available for Sale More than One Year, Number of Securities |  |
Available for Sale, Gross Unrealized Loss | 521 | 109
Available for Sale, Estimated Fair Value | 25,134 | 14,344
Available for Sale, Number of Securities | 10 | 5
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 1,267 | 94
Available for Sale Within One Year, Estimated Fair Value | 89,068 | 26,894
Available for Sale Within One Year, Number of Securities | 31 | 9
Available for Sale More than One Year, Gross Unrealized Loss |  |
Available for Sale More than One Year, Estimated Fair Value |  |
Available for Sale More than One Year, Number of Securities |  |
Available for Sale, Gross Unrealized Loss | 1,267 | 94
Available for Sale, Estimated Fair Value | 89,068 | 26,894
Available for Sale, Number of Securities | 31 | 9
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 183 | 126
Available for Sale Within One Year, Estimated Fair Value | 7,485 | 4,587
Available for Sale Within One Year, Number of Securities | 6 | 4
Available for Sale More than One Year, Gross Unrealized Loss | 3 | 9
Available for Sale More than One Year, Estimated Fair Value | 444 | 1,964
Available for Sale More than One Year, Number of Securities | 1 | 3
Available for Sale, Gross Unrealized Loss | 186 | 135
Available for Sale, Estimated Fair Value | 7,929 | 6,551
Available for Sale, Number of Securities | 7 | 7
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available for Sale Within One Year, Gross Unrealized Loss | 108 |
Available for Sale Within One Year, Estimated Fair Value | 4,880 |
Available for Sale Within One Year, Number of Securities | 1 |
Available for Sale More than One Year, Gross Unrealized Loss | 168 | 246
Available for Sale More than One Year, Estimated Fair Value | 10,819 | 10,738
Available for Sale More than One Year, Number of Securities | 3 | 3
Available for Sale, Gross Unrealized Loss | 276 | 246
Available for Sale, Estimated Fair Value | 15,699 | 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 | 341 | 82
Available for Sale Within One Year, Estimated Fair Value | 13,501 | 11,004
Available for Sale Within One Year, Number of Securities | 4 | 3
Available for Sale More than One Year, Gross Unrealized Loss |  |
Available for Sale More than One Year, Estimated Fair Value |  |
Available for Sale More than One Year, Number of Securities |  |
Available for Sale, Gross Unrealized Loss | 341 | 82
Available for Sale, Estimated Fair Value | 13,501 | 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 | 10 | 1
Available for Sale Within One Year, Estimated Fair Value | 2,016 | 12
Available for Sale Within One Year, Number of Securities | 4 | 1
Available for Sale More than One Year, Gross Unrealized Loss | 83 | 46
Available for Sale More than One Year, Estimated Fair Value | 918 | 953
Available for Sale More than One Year, Number of Securities | 1 | 1
Available for Sale, Gross Unrealized Loss | 93 | 47
Available for Sale, Estimated Fair Value | 2,934 | 965
Available for Sale, Number of Securities | 5 | 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 More than One Year, Gross Unrealized Loss |  |
Available for Sale More than One Year, Estimated Fair Value |  |
Available for Sale More than One Year, Number of Securities |  |
Available for Sale, Gross Unrealized Loss |  | 40
Available for Sale, Estimated Fair Value |  | $ 96
Available for Sale, Number of Securities |  | 1

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