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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 107,257 | $ 4,040
Less than 12 Months, Unrealized Losses | (1,009) | (17)
12 Months or Longer, Fair Value | 123,958 | 146,382
12 Months or Longer, Unrealized Losses | (10,542) | (12,240)
Fair Value | 231,215 | 150,422
Unrealized Losses | (11,551) | (12,257)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 20,138 | 1,112
Less than 12 Months, Unrealized Losses | (660) | (8)
12 Months or Longer, Fair Value | 10,120 | 25,007
12 Months or Longer, Unrealized Losses | (820) | (684)
Fair Value | 30,258 | 26,119
Unrealized Losses | (1,480) | (692)
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 3,041 |
Less than 12 Months, Unrealized Losses | (14) |
12 Months or Longer, Fair Value | 25,102 | 29,448
12 Months or Longer, Unrealized Losses | (967) | (1,017)
Fair Value | 28,143 | 29,448
Unrealized Losses | (981) | (1,017)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 48,344 | 46,137
12 Months or Longer, Unrealized Losses | (7,507) | (9,685)
Fair Value | 48,344 | 46,137
Unrealized Losses | (7,507) | (9,685)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 55,581 |
Less than 12 Months, Unrealized Losses | (136) |
Fair Value | 55,581 |
Unrealized Losses | (136) |
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 28,497 | 2,778
Less than 12 Months, Unrealized Losses | (199) | (3)
12 Months or Longer, Fair Value | 40,246 | 45,790
12 Months or Longer, Unrealized Losses | (1,239) | (854)
Fair Value | 68,743 | 48,568
Unrealized Losses | (1,438) | (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)
12 Months or Longer, Fair Value | 146 |
12 Months or Longer, Unrealized Losses | (9) |
Fair Value | 146 | 150
Unrealized Losses | $ (9) | $ (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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