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Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 511,511 | $ 549,113
Gross Unrealized Gain | 1,609 | 782
Gross Unrealized Loss | 7,143 | 18,969
Estimated Fair Value | 505,977 | 530,926
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 160,422 | 130,636
Gross Unrealized Gain | 240 | 274
Gross Unrealized Loss | 1,037 | 3,217
Estimated Fair Value | 159,625 | 127,693
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,350 | 13,857
Gross Unrealized Gain | 97 | 110
Gross Unrealized Loss | 0 | 30
Estimated Fair Value | 4,447 | 13,937
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,718 | 33,361
Gross Unrealized Gain | 158 | 73
Gross Unrealized Loss | 145 | 1,080
Estimated Fair Value | 16,731 | 32,354
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 17,017 | 21,013
Gross Unrealized Gain | 11 | 8
Gross Unrealized Loss | 103 | 186
Estimated Fair Value | 16,925 | 20,835
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 215,542 | 222,768
Gross Unrealized Gain | 1,103 | 317
Gross Unrealized Loss | 2,010 | 6,026
Estimated Fair Value | 214,635 | 217,059
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 80,960 | 90,852
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 3,096 | 7,316
Estimated Fair Value | 77,864 | 83,536
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,222 | 13,598
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 661 | 969
Estimated Fair Value | 12,561 | 12,629
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,030 | 3,030
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 91 | 144
Estimated Fair Value | 2,939 | 2,886
Equity security [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 250 |
Gross Unrealized Gain | 0 |
Gross Unrealized Loss | 0 |
Estimated Fair Value | 250 |
U.S. treasury bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 19,998
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 1
Estimated Fair Value |  | $ 19,997

X
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