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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 90,326 | $ 4,040
Less than 12 Months, Unrealized Losses | (415) | (17)
12 Months or Longer, Fair Value | 123,452 | 146,382
12 Months or Longer, Unrealized Losses | (8,128) | (12,240)
Fair Value | 213,778 | 150,422
Unrealized Losses | (8,543) | (12,257)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 13,702 | 1,112
Less than 12 Months, Unrealized Losses | (172) | (8)
12 Months or Longer, Fair Value | 10,222 | 25,007
12 Months or Longer, Unrealized Losses | (483) | (684)
Fair Value | 23,924 | 26,119
Unrealized Losses | (655) | (692)
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 24,670 | 29,448
12 Months or Longer, Unrealized Losses | (577) | (1,017)
Fair Value | 24,670 | 29,448
Unrealized Losses | (577) | (1,017)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 49,434 | 46,137
12 Months or Longer, Unrealized Losses | (6,433) | (9,685)
Fair Value | 49,434 | 46,137
Unrealized Losses | (6,433) | (9,685)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 62,257 |
Less than 12 Months, Unrealized Losses | (144) |
Fair Value | 62,257 |
Unrealized Losses | (144) |
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 14,367 | 2,778
Less than 12 Months, Unrealized Losses | (99) | (3)
12 Months or Longer, Fair Value | 39,126 | 45,790
12 Months or Longer, Unrealized Losses | (635) | (854)
Fair Value | 53,493 | 48,568
Unrealized Losses | $ (734) | (857)
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 150
Less than 12 Months, Unrealized Losses |  | (6)
Fair Value |  | 150
Unrealized Losses |  | $ (6)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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