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Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 414,024	$ 399,946
Gross Unrealized Gains	9,109	8,130
Gross Unrealized Losses	(937)	(1,605)
Estimated Fair Value	422,196	406,471
US Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,294	2,008
Gross Unrealized Gains		18
Gross Unrealized Losses	(6)
Estimated Fair Value	1,288	2,026
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,749	67,851
Gross Unrealized Gains	4,166	3,634
Gross Unrealized Losses	(146)	(145)
Estimated Fair Value	80,769	71,340
U.S. Government agencies collateralized by mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	334,645	328,751
Gross Unrealized Gains	4,470	4,467
Gross Unrealized Losses	(785)	(1,460)
Estimated Fair Value	338,330	331,758
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,336	1,336
Gross Unrealized Gains	473	11
Estimated Fair Value	$ 1,809	$ 1,347

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

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