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Amortized Cost and Estimated Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 563,459		$ 534,810
Unrealized Gains	6,363		14,408
Unrealized Losses	(24,146)		(14,860)
Fair Value	545,676		534,358
OTTI in AOCI	(3,219)	[1]	(3,148)	[1]
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,701
Unrealized Losses	(435)
Fair Value	9,266
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	152,965		151,119
Unrealized Gains	2,760		8,195
Unrealized Losses	(3,923)		(97)
Fair Value	151,802		159,217
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,750		55,707
Unrealized Losses	(9,811)		(11,061)
Fair Value	45,939		44,646
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000
Unrealized Losses	(67)
Fair Value	4,933
Mortgage-backed securities Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	321,486		310,323
Unrealized Gains	3,416		6,023
Unrealized Losses	(6,637)		(449)
Fair Value	318,265		315,897
Mortgage-backed securities Non-Agency Alt-A residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,242		14,215
Unrealized Losses	(3,219)		(3,148)
Fair Value	10,023		11,067
OTTI in AOCI	(3,219)	[1]	(3,148)	[1]
Total Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	334,728		324,538
Unrealized Gains	3,416		6,023
Unrealized Losses	(9,856)		(3,597)
Fair Value	328,288		326,964
OTTI in AOCI	(3,219)	[1]	(3,148)	[1]
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,315		3,446
Unrealized Gains	187		190
Unrealized Losses	(54)		(105)
Fair Value	$ 5,448		$ 3,531
[1] Other-than-temporary impairment in accumulated other comprehensive income

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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- Definition

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

+ References

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-Publisher FASB

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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