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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,167	$ 109,950
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(1)	(544)
Available-for-sale Securities, 12 Months or Longer, Fair Value	48,701	119,438
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(2,863)	(10,027)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	49,868	229,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,864)	(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	(7)	(309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	767	18,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(7)	(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	19,323	47,832
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(2,772)	(8,050)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,323	47,832
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,772)	(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, 12 Months or Longer, Fair Value	15,022
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	15,022	70,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(5)	(238)
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Less than 12 Months, Fair Value	1,167	27,050
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(1)	(253)
Available-for-sale Securities, 12 Months or Longer, Fair Value	13,589	37,291
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(79)	(922)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,756	64,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (80)	$ (1,175)

X

- 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

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+ References

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-Publisher FASB
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-Publisher FASB
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