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Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 532,501 | $ 549,113
Gross Unrealized Gain | 459 | 782
Gross Unrealized Loss | 11,970 | 18,969
Estimated Fair Value | 520,990 | 530,926
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 149,269 | 130,636
Gross Unrealized Gain | 123 | 274
Gross Unrealized Loss | 1,361 | 3,217
Estimated Fair Value | 148,031 | 127,693
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,365 | 13,857
Gross Unrealized Gain | 67 | 110
Gross Unrealized Loss |  | 30
Estimated Fair Value | 4,432 | 13,937
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,036 | 33,361
Gross Unrealized Gain | 160 | 73
Gross Unrealized Loss | 521 | 1,080
Estimated Fair Value | 21,675 | 32,354
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,014 | 21,013
Gross Unrealized Gain | 20 | 8
Gross Unrealized Loss | 128 | 186
Estimated Fair Value | 20,906 | 20,835
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 228,363 | 222,768
Gross Unrealized Gain | 86 | 317
Gross Unrealized Loss | 4,084 | 6,026
Estimated Fair Value | 224,365 | 217,059
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 90,855 | 90,852
Gross Unrealized Gain | 3 |
Gross Unrealized Loss | 4,880 | 7,316
Estimated Fair Value | 85,978 | 83,536
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,569 | 13,598
Gross Unrealized Gain |  |
Gross Unrealized Loss | 867 | 969
Estimated Fair Value | 12,702 | 12,629
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,030 | 3,030
Gross Unrealized Gain |  |
Gross Unrealized Loss | 129 | 144
Estimated Fair Value | 2,901 | 2,886
U.S. treasury bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 19,998
Gross Unrealized Gain |  |
Gross Unrealized Loss |  | 1
Estimated Fair Value |  | $ 19,997

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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