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Summary of Other Operating Income and Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other operating income      
Miscellaneous income $ 2,459 $ 236 $ 261
Other operating expense      
Service fees 3,736 2,941 3,315
Professional fees 1,912 1,554 1,999
Office supplies 1,688 1,222 1,369
Telephone and data communications 1,548 1,616 1,468
ATM processing expenses 1,483 1,515 1,248
Advertising and public relations $ 1,421 $ 1,683 $ 1,584