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Investment Securities - Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 Security | Dec. 31, 2012 Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 7,459 | $ 638
Available-for-Sale Within One Year, Estimated Fair Value | 193,127 | 85,291
Available-for-Sale Within One Year, Number of Securities | 80 | 33
Available-for-Sale More than One Year, Gross Unrealized Loss | 4,484 | 301
Available-for-Sale More than One Year, Estimated Fair Value | 73,871 | 13,655
Available-for-Sale More than One Year, Number of Securities | 31 | 7
Available-for-Sale, Gross Unrealized Loss | 11,943 | 939
Available-for-Sale, Estimated Fair Value | 266,998 | 98,946
Available-for-Sale, Number of Securities | 111 | 40
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 1,552 | 186
Available-for-Sale Within One Year, Estimated Fair Value | 64,931 | 28,354
Available-for-Sale Within One Year, Number of Securities | 21 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | 1,619 |
Available-for-Sale More than One Year, Estimated Fair Value | 22,774 |
Available-for-Sale More than One Year, Number of Securities | 9 |
Available-for-Sale, Gross Unrealized Loss | 3,171 | 186
Available-for-Sale, Estimated Fair Value | 87,705 | 28,354
Available-for-Sale, Number of Securities | 30 | 10
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 4,577 | 94
Available-for-Sale Within One Year, Estimated Fair Value | 70,263 | 26,894
Available-for-Sale Within One Year, Number of Securities | 26 | 9
Available-for-Sale More than One Year, Gross Unrealized Loss | 1,393 |
Available-for-Sale More than One Year, Estimated Fair Value | 19,603 |
Available-for-Sale More than One Year, Number of Securities | 7 |
Available-for-Sale, Gross Unrealized Loss | 5,970 | 94
Available-for-Sale, Estimated Fair Value | 89,866 | 26,894
Available-for-Sale, Number of Securities | 33 | 9
Collateralized Mortgage Obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 500 | 109
Available-for-Sale Within One Year, Estimated Fair Value | 24,478 | 14,344
Available-for-Sale Within One Year, Number of Securities | 12 | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | 354 |
Available-for-Sale More than One Year, Estimated Fair Value | 9,610 |
Available-for-Sale More than One Year, Number of Securities | 4 |
Available-for-Sale, Gross Unrealized Loss | 854 | 109
Available-for-Sale, Estimated Fair Value | 34,088 | 14,344
Available-for-Sale, Number of Securities | 16 | 5
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 13 |
Available-for-Sale Within One Year, Estimated Fair Value | 4,065 |
Available-for-Sale Within One Year, Number of Securities | 2 |
Available-for-Sale, Gross Unrealized Loss | 13 |
Available-for-Sale, Estimated Fair Value | 4,065 |
Available-for-Sale, Number of Securities | 2 |
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 479 | 126
Available-for-Sale Within One Year, Estimated Fair Value | 19,783 | 4,587
Available-for-Sale Within One Year, Number of Securities | 14 | 4
Available-for-Sale More than One Year, Gross Unrealized Loss | 242 | 9
Available-for-Sale More than One Year, Estimated Fair Value | 3,876 | 1,964
Available-for-Sale More than One Year, Number of Securities | 4 | 3
Available-for-Sale, Gross Unrealized Loss | 721 | 135
Available-for-Sale, Estimated Fair Value | 23,659 | 6,551
Available-for-Sale, Number of Securities | 18 | 7
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 91 |
Available-for-Sale Within One Year, Estimated Fair Value | 4,899 |
Available-for-Sale Within One Year, Number of Securities | 1 |
Available-for-Sale More than One Year, Gross Unrealized Loss | 114 | 246
Available-for-Sale More than One Year, Estimated Fair Value | 6,874 | 10,738
Available-for-Sale More than One Year, Number of Securities | 2 | 3
Available-for-Sale, Gross Unrealized Loss | 205 | 246
Available-for-Sale, Estimated Fair Value | 11,773 | 10,738
Available-for-Sale, Number of Securities | 3 | 3
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 229 | 82
Available-for-Sale Within One Year, Estimated Fair Value | 2,714 | 11,004
Available-for-Sale Within One Year, Number of Securities | 1 | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | 676 |
Available-for-Sale More than One Year, Estimated Fair Value | 10,207 |
Available-for-Sale More than One Year, Number of Securities | 3 |
Available-for-Sale, Gross Unrealized Loss | 905 | 82
Available-for-Sale, Estimated Fair Value | 12,921 | 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 | 18 | 1
Available-for-Sale Within One Year, Estimated Fair Value | 1,994 | 12
Available-for-Sale Within One Year, Number of Securities | 3 | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | 86 | 46
Available-for-Sale More than One Year, Estimated Fair Value | 927 | 953
Available-for-Sale More than One Year, Number of Securities | 2 | 1
Available-for-Sale, Gross Unrealized Loss | 104 | 47
Available-for-Sale, Estimated Fair Value | 2,921 | 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, Gross Unrealized Loss |  | 40
Available-for-Sale, Estimated Fair Value |  | $ 96
Available-for-Sale, Number of Securities |  | 1

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