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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 579,878 | $ 681,510
Unrealized Gains | 11,778 | 12,714
Unrealized Losses | (4,323) | (8,504)
Fair Value | 587,333 | 685,720
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 145,440 | 155,482
Unrealized Gains | 2,102 | 2,301
Unrealized Losses | (533) | (2,219)
Fair Value | 147,009 | 155,564
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 174,367 | 174,600
Unrealized Gains | 6,291 | 6,804
Unrealized Losses | (229) | (402)
Fair Value | 180,429 | 181,002
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 184,471 | 265,678
Unrealized Gains | 1,825 | 2,291
Unrealized Losses | (1,949) | (2,805)
Fair Value | 184,347 | 265,164
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,793 | 20,791
Unrealized Gains | 179 | 139
Unrealized Losses | (936) | (1,500)
Fair Value | 19,036 | 19,430
Pooled Trust Preferred [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 | 800
Unrealized Gains | 360 | 105
Unrealized Losses | 0 | 0
Fair Value | 1,160 | 905
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 53,987 | 63,139
Unrealized Gains | 1,021 | 1,074
Unrealized Losses | (649) | (1,560)
Fair Value | 54,359 | 62,653
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,020 | 1,020
Unrealized Gains | 0 | 0
Unrealized Losses | (27) | (18)
Fair Value | $ 993 | $ 1,002

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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