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Investment Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 Security | Dec. 31, 2013 Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,411 | $ 10,607
Available-for-Sale Within One Year, Estimated Fair Value | 171,377 | 366,638
Available-for-Sale Within One Year, Number of Securities | 46 | 124
Available-for-Sale More than One Year, Gross Unrealized Loss | 10,559 | 8,362
Available-for-Sale More than One Year, Estimated Fair Value | 215,948 | 107,384
Available-for-Sale More than One Year, Number of Securities | 89 | 45
Available-for-Sale, Gross Unrealized Loss | 11,970 | 18,969
Available-for-Sale, Estimated Fair Value | 387,325 | 474,022
Available-for-Sale, Number of Securities | 135 | 169
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 519 | 2,353
Available-for-Sale Within One Year, Estimated Fair Value | 65,206 | 87,026
Available-for-Sale Within One Year, Number of Securities | 15 | 27
Available-for-Sale More than One Year, Gross Unrealized Loss | 842 | 864
Available-for-Sale More than One Year, Estimated Fair Value | 20,383 | 14,657
Available-for-Sale More than One Year, Number of Securities | 9 | 7
Available-for-Sale, Gross Unrealized Loss | 1,361 | 3,217
Available-for-Sale, Estimated Fair Value | 85,589 | 101,683
Available-for-Sale, Number of Securities | 24 | 34
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 30
Available-for-Sale Within One Year, Estimated Fair Value |  | 8,562
Available-for-Sale Within One Year, Number of Securities |  | 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 |  | 30
Available-for-Sale, Estimated Fair Value |  | 8,562
Available-for-Sale, Number of Securities |  | 5
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 3 | 787
Available-for-Sale Within One Year, Estimated Fair Value | 1,744 | 22,817
Available-for-Sale Within One Year, Number of Securities | 1 | 16
Available-for-Sale More than One Year, Gross Unrealized Loss | 518 | 293
Available-for-Sale More than One Year, Estimated Fair Value | 12,907 | 3,813
Available-for-Sale More than One Year, Number of Securities | 11 | 4
Available-for-Sale, Gross Unrealized Loss | 521 | 1,080
Available-for-Sale, Estimated Fair Value | 14,651 | 26,630
Available-for-Sale, Number of Securities | 12 | 20
U.S. treasury bills [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 1
Available-for-Sale Within One Year, Estimated Fair Value |  | 19,996
Available-for-Sale Within One Year, Number of Securities |  | 2
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
Available-for-Sale, Estimated Fair Value |  | 19,996
Available-for-Sale, Number of Securities |  | 2
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 889 | 3,437
Available-for-Sale Within One Year, Estimated Fair Value | 104,423 | 170,324
Available-for-Sale Within One Year, Number of Securities | 29 | 51
Available-for-Sale More than One Year, Gross Unrealized Loss | 3,195 | 2,589
Available-for-Sale More than One Year, Estimated Fair Value | 74,226 | 30,947
Available-for-Sale More than One Year, Number of Securities | 27 | 12
Available-for-Sale, Gross Unrealized Loss | 4,084 | 6,026
Available-for-Sale, Estimated Fair Value | 178,649 | 201,271
Available-for-Sale, Number of Securities | 56 | 63
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 3,942
Available-for-Sale Within One Year, Estimated Fair Value |  | 50,932
Available-for-Sale Within One Year, Number of Securities |  | 19
Available-for-Sale More than One Year, Gross Unrealized Loss | 4,880 | 3,374
Available-for-Sale More than One Year, Estimated Fair Value | 80,979 | 32,606
Available-for-Sale More than One Year, Number of Securities | 30 | 12
Available-for-Sale, Gross Unrealized Loss | 4,880 | 7,316
Available-for-Sale, Estimated Fair Value | 80,979 | 83,538
Available-for-Sale, Number of Securities | 30 | 31
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 9
Available-for-Sale Within One Year, Estimated Fair Value |  | 5,024
Available-for-Sale Within One Year, Number of Securities |  | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | 128 | 177
Available-for-Sale More than One Year, Estimated Fair Value | 11,856 | 11,803
Available-for-Sale More than One Year, Number of Securities | 3 | 3
Available-for-Sale, Gross Unrealized Loss | 128 | 186
Available-for-Sale, Estimated Fair Value | 11,856 | 16,827
Available-for-Sale, Number of Securities | 3 | 4
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  |
Available-for-Sale Within One Year, Estimated Fair Value |  |
Available-for-Sale Within One Year, Number of Securities |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | 867 | 969
Available-for-Sale More than One Year, Estimated Fair Value | 12,701 | 12,629
Available-for-Sale More than One Year, Number of Securities | 4 | 4
Available-for-Sale, Gross Unrealized Loss | 867 | 969
Available-for-Sale, Estimated Fair Value | 12,701 | 12,629
Available-for-Sale, Number of Securities | 4 | 4
Other securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 48
Available-for-Sale Within One Year, Estimated Fair Value | 4 | 1,957
Available-for-Sale Within One Year, Number of Securities | 1 | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | 129 | 96
Available-for-Sale More than One Year, Estimated Fair Value | 2,896 | 929
Available-for-Sale More than One Year, Number of Securities | 5 | 3
Available-for-Sale, Gross Unrealized Loss | 129 | 144
Available-for-Sale, Estimated Fair Value | $ 2,900 | $ 2,886
Available-for-Sale, Number of Securities | 6 | 6

X
- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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