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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	Mar. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 539,398		$ 534,810
Unrealized Gains	12,781		14,408
Unrealized Losses	(14,672)		(14,860)
Fair Value	537,507		534,358
OTTI in AOCI	(3,140)	[1]	(3,148)	[1]
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	150,706		151,119
Unrealized Gains	6,933		8,195
Unrealized Losses	(411)		(97)
Fair Value	157,228		159,217
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	55,721		55,707
Unrealized Losses	(9,970)		(11,061)
Fair Value	45,751		44,646
Mortgage-backed securities Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	317,713		310,323
Unrealized Gains	5,655		6,023
Unrealized Losses	(1,084)		(449)
Fair Value	322,284		315,897
Mortgage-backed securities Non-Agency Alt-A residential
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	14,009		14,215
Unrealized Losses	(3,140)		(3,148)
Fair Value	10,869		11,067
OTTI in AOCI	(3,140)	[1]	(3,148)	[1]
Total Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	331,722		324,538
Unrealized Gains	5,655		6,023
Unrealized Losses	(4,224)		(3,597)
Fair Value	333,153		326,964
OTTI in AOCI	(3,140)	[1]	(3,148)	[1]
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,249		3,446
Unrealized Gains	193		190
Unrealized Losses	(67)		(105)
Fair Value	$ 1,375		$ 3,531
[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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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

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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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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