Investment Securities (Detail) - Amortized cost, gross unrealized gains and losses, and estimated fair value on investment securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Estimated Fair Value	$ 314,597	$ 253,798	$ 442,531
Securities held to maturity
Amortized Cost	14,869	15,555	19,835
Gross Unrealized Gains	2,073	2,312
Gross Unrealized Losses	0	0
Estimated Fair Value	16,942	17,867	22,553
Nonmarketable securities
Amortized Cost	19,245	20,914	37,965
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	19,245	20,914
State And Municipal Obligations [Member]
Securities held to maturity
Amortized Cost	14,369	15,055
Gross Unrealized Gains	2,073	2,312
Gross Unrealized Losses	0	0
Estimated Fair Value	16,442	17,367
Certificates of Deposit [Member]
Securities held to maturity
Amortized Cost	500	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	500	500
US Government Agencies And Corporations [Member]
Amortized Cost	1,227	1,260
Gross Unrealized Gains	17	18
Gross Unrealized Losses	0	0
Estimated Fair Value	1,244	1,278
State And Municipal Obligations [Member]
Amortized Cost	13,378	13,460
Gross Unrealized Gains	35	84
Gross Unrealized Losses	150	61
Estimated Fair Value	13,263	13,483
Collateralized Debt Obligations [Member]
Amortized Cost	6,106	6,191
Gross Unrealized Gains	76	156
Gross Unrealized Losses	2,678	3,015
Estimated Fair Value	3,504	3,332
Mortgage Backed Securities Excluding Collateralized Mortgage Obligations [Member]
Amortized Cost	143,543	72,527
Gross Unrealized Gains	1,956	1,928
Gross Unrealized Losses	191	151
Estimated Fair Value	145,308	74,304
Collateralized Mortgage Obligations [Member]
Amortized Cost	145,159	157,534
Gross Unrealized Gains	1,687	1,249
Gross Unrealized Losses	2,339	3,900
Estimated Fair Value	144,507	154,883
Other Equity And Debt Securities [Member]
Amortized Cost	5,656	5,609
Gross Unrealized Gains	1,281	1,089
Gross Unrealized Losses	166	180
Estimated Fair Value	6,771	6,518
Securities Held To Maturity [Member]
Amortized Cost	315,069	256,581
Gross Unrealized Gains	5,052	4,524
Gross Unrealized Losses	5,524	7,307
Estimated Fair Value	314,597	253,798
Federal Home Loan Bank Stock [Member]
Nonmarketable securities
Amortized Cost	14,674	16,343
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	14,674	16,343
Federal Reserve Bank Stock [Member]
Nonmarketable securities
Amortized Cost	4,571	4,571
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 4,571	$ 4,571

Value of federal home loan bank stock and federal reserve bank stock estimated fair value.

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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 of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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