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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 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 | $ 37,086 | $ 109,950
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (693) | (544)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 32,505 | 119,438
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (2,523) | (10,027)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 69,591 | 229,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,216) | (10,571)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 24,252 | 8,126
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (527) | (48)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 715 | 10,393
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (59) | (309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,967 | 18,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (586) | (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 |  | 23,922
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | (746)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 28,363
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (751)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 19,939 | 47,832
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (2,165) | (8,050)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 19,939 | 47,832
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,165) | (8,050)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 70,333
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | (238)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 70,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (238)
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 12,834 | 27,050
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (166) | (253)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 11,851 | 37,291
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (299) | (922)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,685 | 64,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (465) | $ (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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