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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
ASSETS        
Cash and cash equivalents $ 32,856 $ 31,881 $ 32,946 $ 39,703
Interest bearing time deposits with other banks 275 225    
Securities available for sale 700,531 737,311    
Trading securities 4,358 4,459    
Loans held for sale 399 2,398    
Net loans 1,011,750 913,764    
FHLB and other equity interests 7,580 6,684    
LIABILITIES        
Deposits (1,552,281) (1,485,003)    
Subordinated debentures (20,620) (20,620)    
Carrying Amount [Member]
        
ASSETS        
Cash and cash equivalents 32,856 31,881    
Interest bearing time deposits with other banks 275 225    
Securities available for sale 700,531 737,311    
Trading securities 4,358 4,459    
Loans held for sale 399 2,398    
Net loans 1,011,750 913,764    
FHLB and other equity interests 7,580 6,684    
Accrued interest receivable 7,267 6,863    
LIABILITIES        
Deposits (1,552,281) (1,485,003)    
FHLB and other borrowings (122,976) (97,806)    
Subordinated debentures (20,620) (20,620)    
Interest rate swaps (1,241) (1,745)    
Accrued interest payable (805) (1,022)    
Total Fair Value [Member]
        
ASSETS        
Cash and cash equivalents 32,856 31,881    
Interest bearing time deposits with other banks 281 230    
Securities available for sale 700,531 737,311    
Trading securities 4,358 4,459    
Loans held for sale 410 2,460    
Net loans 1,008,375 917,785    
Accrued interest receivable 7,267 6,863    
LIABILITIES        
Deposits (1,551,905) (1,487,545)    
FHLB and other borrowings (122,976) (105,850)    
Subordinated debentures (10,945) (10,682)    
Interest rate swaps (1,241) (1,745)    
Accrued interest payable (805) (1,022)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
        
ASSETS        
Cash and cash equivalents 32,856 31,881    
Interest bearing time deposits with other banks 0 0    
Securities available for sale 70,509 54,169    
Trading securities 4,153 4,300    
Loans held for sale 0 0    
Net loans 0 0    
Accrued interest receivable 429 278    
LIABILITIES        
Deposits (1,365,864) (1,272,060)    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable (200) (301)    
Significant Other Observable Inputs (Level 2) [Member]
        
ASSETS        
Cash and cash equivalents 0 0    
Interest bearing time deposits with other banks 281 230    
Securities available for sale 629,246 680,562    
Trading securities 205 159    
Loans held for sale 410 2,460    
Net loans 0 0    
Accrued interest receivable 3,827 3,498    
LIABILITIES        
Deposits (186,041) (215,485)    
FHLB and other borrowings (122,976) (105,850)    
Subordinated debentures (10,945) (10,682)    
Interest rate swaps (1,241) (1,745)    
Accrued interest payable (590) (707)    
Significant Unobservable Inputs (Level 3) [Member]
        
ASSETS        
Cash and cash equivalents 0 0    
Interest bearing time deposits with other banks 0 0    
Securities available for sale 776 2,580    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 1,008,375 917,785    
Accrued interest receivable 3,011 3,087    
LIABILITIES        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable $ (15) $ (14)