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Investment Securities with Unrealized Gross Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (1,412) $ (1,104)
Fair Value, Less Than Twelve Months 136,980 118,361
Gross Unrealized Losses, Over Twelve Months (147) (61)
Fair Value, Over Twelve Months 12,260 6,965
U.S. Government agencies
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (18) (17)
Fair Value, Less Than Twelve Months 1,993 1,996
Gross Unrealized Losses, Over Twelve Months 0 0
Fair Value, Over Twelve Months 0 0
U.S. Government agencies collateralized by mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (919) (903)
Fair Value, Less Than Twelve Months 112,437 106,799
Gross Unrealized Losses, Over Twelve Months (132) (61)
Fair Value, Over Twelve Months 11,942 6,965
Other Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 (4)
Fair Value, Less Than Twelve Months 0 242
Gross Unrealized Losses, Over Twelve Months 0 0
Fair Value, Over Twelve Months 0 0
Obligations of State and Political Subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (475) (180)
Fair Value, Less Than Twelve Months 22,550 9,324
Gross Unrealized Losses, Over Twelve Months (15) 0
Fair Value, Over Twelve Months $ 318 $ 0