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Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 393,501 $ 373,865
Gross Unrealized Gains 5,136 7,488
Gross Unrealized Losses (5,061) (1,165)
Estimated Fair Value 393,576 380,188
U.S. Government agencies
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,363 2,987
Gross Unrealized Gains 4 3
Gross Unrealized Losses (74) (17)
Estimated Fair Value 4,293 2,973
Obligations of State and Political Subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 87,237 70,736
Gross Unrealized Gains 2,138 3,430
Gross Unrealized Losses (1,970) (180)
Estimated Fair Value 87,405 73,986
U.S. Government agencies collateralized by mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 300,565 298,806
Gross Unrealized Gains 2,096 3,547
Gross Unrealized Losses (3,017) (964)
Estimated Fair Value 299,644 301,389
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,336 1,336
Gross Unrealized Gains 898 508
Gross Unrealized Losses 0 (4)
Estimated Fair Value $ 2,234 $ 1,840