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Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 399,900 | $ 443,712
Gross Unrealized Gain | 5,470 | 8,287
Gross Unrealized Loss | 4,555 | 939
Estimated Fair Value | 400,815 | 451,060
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,177 | 157,185
Gross Unrealized Gain | 1,312 | 3,327
Gross Unrealized Loss | 1,871 | 186
Estimated Fair Value | 124,618 | 160,326
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 83,955 | 98,821
Gross Unrealized Gain | 1,414 | 1,775
Gross Unrealized Loss | 521 | 109
Estimated Fair Value | 84,848 | 100,487
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 98,853 | 92,990
Gross Unrealized Gain | 18 | 222
Gross Unrealized Loss | 1,267 | 94
Estimated Fair Value | 97,604 | 93,118
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,166 | 12,209
Gross Unrealized Gain | 485 | 603
Estimated Fair Value | 10,651 | 12,812
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 44,053 | 44,248
Gross Unrealized Gain | 1,679 | 2,029
Gross Unrealized Loss | 186 | 135
Estimated Fair Value | 45,546 | 46,142
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,475 | 20,470
Gross Unrealized Gain | 176 | 176
Gross Unrealized Loss | 276 | 246
Estimated Fair Value | 20,375 | 20,400
SBA Loan Pool Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,842 | 14,104
Gross Unrealized Gain |  | 4
Gross Unrealized Loss | 341 | 82
Estimated Fair Value | 13,501 | 14,026
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,025 | 3,331
Gross Unrealized Gain | 1 | 73
Gross Unrealized Loss | 93 | 47
Estimated Fair Value | 2,933 | 3,357
Equity securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 354 | 354
Gross Unrealized Gain | 385 | 78
Gross Unrealized Loss |  | 40
Estimated Fair Value | $ 739 | $ 392

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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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