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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
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)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-Publisher FASB
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