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Amortized Cost and Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 360,473		$ 541,642
Unrealized Gains	4,771		4,467
Unrealized Losses	(13,551)		(26,289)
Fair Value	351,693		519,820
OTTI in AOCI	(1,622)	[1]	(2,754)	[1]
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	137,899		147,049
Unrealized Gains	4,411		1,868
Unrealized Losses	(1,248)		(4,637)
Fair Value	141,062		144,280
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,807		55,764
Unrealized Losses	(7,125)		(9,530)
Fair Value	48,682		46,234
Mortgage-backed securities Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	140,528		306,319
Unrealized Gains	292		2,575
Unrealized Losses	(3,301)		(8,508)
Fair Value	137,519		300,386
Mortgage-backed securities Non-Agency Alt-A residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,284		12,543
Unrealized Losses	(1,622)		(2,754)
Fair Value	9,662		9,789
OTTI in AOCI	(1,622)	[1]	(2,754)	[1]
Total Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	151,812		318,862
Unrealized Gains	292		2,575
Unrealized Losses	(4,923)		(11,262)
Fair Value	147,181		310,175
OTTI in AOCI	(1,622)	[1]	(2,754)	[1]
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	226		5,259
Unrealized Gains	20		24
Unrealized Losses	(4)		(36)
Fair Value	242		5,247
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,729		9,708
Unrealized Losses	(251)		(695)
Fair Value	9,478		9,013
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000		5,000
Unrealized Gains	48
Unrealized Losses			(129)
Fair Value	$ 5,048		$ 4,871
[1] Other-than-temporary impairment in accumulated other comprehensive income

X

- Definition

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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