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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 37,529 | $ 109,950
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (17) | (544)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 103,988 | 119,438
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (9,410) | (10,027)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 141,517 | 229,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,427) | (10,571)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 8,126
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | (48)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 767 | 10,393
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (8) | (309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 767 | 18,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (8) | (357)
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 4,441
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | (5)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 11,527 | 23,922
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (57) | (746)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11,527 | 28,363
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (57) | (751)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 46,666 | 47,832
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (9,246) | (8,050)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 46,666 | 47,832
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,246) | (8,050)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 36,025 | 70,333
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (13) | (238)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 29,061 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (17) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 65,086 | 70,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (30) | (238)
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,504 | 27,050
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (4) | (253)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 15,967 | 37,291
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (82) | (922)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 17,471 | 64,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (86) | $ (1,175)

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27337-111563 + Details
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