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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 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 | $ 67,043 | $ 109,950
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (108) | (544)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 118,506 | 119,438
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (12,525) | (10,027)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 185,549 | 229,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (12,633) | (10,571)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 395 | 8,126
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (1) | (48)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 3,239 | 10,393
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (58) | (309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,634 | 18,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (59) | (357)
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,418 | 4,441
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (1) | (5)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 23,809 | 23,922
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (256) | (746)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 25,227 | 28,363
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (257) | (751)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 44,088 | 47,832
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (11,809) | (8,050)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 44,088 | 47,832
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (11,809) | (8,050)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 60,210 | 70,333
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (84) | (238)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 10,041 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (8) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 70,251 | 70,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (92) | (238)
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 5,020 | 27,050
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (22) | (253)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 37,329 | 37,291
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (394) | (922)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 42,349 | 64,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (416) | $ (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=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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