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

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=27724398&loc=d3e27290-111563

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
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