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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	Jun. 30, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 407,602		$ 541,642
Unrealized Gains	5,472		4,467
Unrealized Losses	(14,649)		(26,289)
Fair Value	398,425		519,820
OTTI in AOCI	(1,733)	[1]	(2,754)	[1]
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	141,820		147,049
Unrealized Gains	4,059		1,868
Unrealized Losses	(1,744)		(4,637)
Fair Value	144,135		144,280
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,792		55,764
Unrealized Losses	(7,482)		(9,530)
Fair Value	48,310		46,234
Mortgage-backed securities Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	182,775		306,319
Unrealized Gains	1,053		2,575
Unrealized Losses	(3,438)		(8,508)
Fair Value	180,390		300,386
Mortgage-backed securities Non-Agency Alt-A residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,741		12,543
Unrealized Losses	(1,733)		(2,754)
Fair Value	10,008		9,789
OTTI in AOCI	(1,733)	[1]	(2,754)	[1]
Total Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	194,516		318,862
Unrealized Gains	1,053		2,575
Unrealized Losses	(5,171)		(11,262)
Fair Value	190,398		310,175
OTTI in AOCI	(1,733)	[1]	(2,754)	[1]
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	752		5,259
Unrealized Gains	302		24
Unrealized Losses	(2)		(36)
Fair Value	1,052		5,247
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,722		9,708
Unrealized Losses	(250)		(695)
Fair Value	9,472		9,013
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000		5,000
Unrealized Gains	58
Unrealized Losses			(129)
Fair Value	$ 5,058		$ 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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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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