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Securities - Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 708,303 | $ 712,637
Unrealized Gains | 11,248 | 28,181
Unrealized Losses | (19,020) | (3,507)
Fair Value | 700,531 | 737,311
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,003 | 4,018
Unrealized Gains | 4 | 18
Unrealized Losses | 0 | 0
Fair Value | 2,007 | 4,036
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 179,875 | 157,965
Unrealized Gains | 3,175 | 5,977
Unrealized Losses | (5,820) | (161)
Fair Value | 177,230 | 163,781
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 177,503 | 170,223
Unrealized Gains | 4,416 | 11,113
Unrealized Losses | (2,056) | (57)
Fair Value | 179,863 | 181,279
Residential and Multi Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 258,466 | 308,800
Unrealized Gains | 2,945 | 8,724
Unrealized Losses | (6,372) | (702)
Fair Value | 255,039 | 316,822
Commercial Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 971 | 1,275
Unrealized Gains | 0 | 29
Unrealized Losses | (21) | 0
Fair Value | 950 | 1,304
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,741 | 17,368
Unrealized Gains | 56 | 26
Unrealized Losses | (1,640) | (2,370)
Fair Value | 14,157 | 15,024
Pooled Trust Preferred [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 | 800
Unrealized Gains | 0 | 0
Unrealized Losses | (24) | (200)
Fair Value | 776 | 600
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 71,924 | 50,667
Unrealized Gains | 652 | 2,277
Unrealized Losses | (3,063) | (17)
Fair Value | 69,513 | 52,927
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,020 | 1,521
Unrealized Gains | 0 | 17
Unrealized Losses | (24) | 0
Fair Value | $ 996 | $ 1,538

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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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