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Short-term Borrowings - Interest Expense on Short-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 1,070 $ 728 $ 1,948
Federal funds purchased [Member]
      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 128 41 105
Borrowings from FHLB [Member]
      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 545 16 1,069
Securities sold under agreements to repurchase [Member]
      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 397 $ 671 $ 774