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Amortized Cost and Estimated Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 563,459 |  | $ 534,810 |
Unrealized Gains | 6,363 |  | 14,408 |
Unrealized Losses | (24,146) |  | (14,860) |
Fair Value | 545,676 |  | 534,358 |
OTTI in AOCI | (3,219) | [1] | (3,148) | [1]
US Treasury Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 9,701 |  |  |
Unrealized Losses | (435) |  |  |
Fair Value | 9,266 |  |  |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 152,965 |  | 151,119 |
Unrealized Gains | 2,760 |  | 8,195 |
Unrealized Losses | (3,923) |  | (97) |
Fair Value | 151,802 |  | 159,217 |
Single Issue Trust Preferred Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 55,750 |  | 55,707 |
Unrealized Losses | (9,811) |  | (11,061) |
Fair Value | 45,939 |  | 44,646 |
Corporate securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,000 |  |  |
Unrealized Losses | (67) |  |  |
Fair Value | 4,933 |  |  |
Mortgage-backed securities Agency |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 321,486 |  | 310,323 |
Unrealized Gains | 3,416 |  | 6,023 |
Unrealized Losses | (6,637) |  | (449) |
Fair Value | 318,265 |  | 315,897 |
Mortgage-backed securities Non-Agency Alt-A residential |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 13,242 |  | 14,215 |
Unrealized Losses | (3,219) |  | (3,148) |
Fair Value | 10,023 |  | 11,067 |
OTTI in AOCI | (3,219) | [1] | (3,148) | [1]
Total Mortgage Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 334,728 |  | 324,538 |
Unrealized Gains | 3,416 |  | 6,023 |
Unrealized Losses | (9,856) |  | (3,597) |
Fair Value | 328,288 |  | 326,964 |
OTTI in AOCI | (3,219) | [1] | (3,148) | [1]
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,315 |  | 3,446 |
Unrealized Gains | 187 |  | 190 |
Unrealized Losses | (54) |  | (105) |
Fair Value | $ 5,448 |  | $ 3,531 |
[1] | Other-than-temporary impairment in accumulated other comprehensive income

X
- 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 Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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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