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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
ASSETS        
Cash and cash equivalents $ 33,866 $ 29,633 $ 38,491 $ 31,881
Interest bearing time deposits with other banks 225 275    
Securities available for sale 687,862 685,991    
Trading securities 4,073 4,127    
Loans held for sale 329 487    
Net loans 1,277,422 1,279,129    
FHLB and other equity interests 7,519 7,533    
LIABILITIES        
Deposits (1,828,658) (1,835,314)    
Subordinated debentures (20,620) (20,620)    
Carrying Amount [Member]
        
ASSETS        
Cash and cash equivalents 33,866 29,633    
Interest bearing time deposits with other banks 225 275    
Securities available for sale 687,862 685,991    
Trading securities 4,073 4,127    
Loans held for sale 329 487    
Net loans 1,277,422 1,279,129    
FHLB and other equity interests 7,519 7,533    
Accrued interest receivable 8,215 8,032    
LIABILITIES        
Deposits (1,828,658) (1,835,314)    
FHLB and other borrowings (91,149) (87,950)    
Subordinated debentures (20,620) (20,620)    
Interest rate swaps (1,079) (1,116)    
Accrued interest payable (827) (868)    
Total Fair Value [Member]
        
ASSETS        
Cash and cash equivalents 33,866 29,633    
Interest bearing time deposits with other banks 225 274    
Securities available for sale 687,862 685,991    
Trading securities 4,073 4,127    
Loans held for sale 348 507    
Net loans 1,274,928 1,276,622    
Accrued interest receivable 8,215 8,032    
LIABILITIES        
Deposits (1,828,222) (1,834,789)    
FHLB and other borrowings (91,028) (87,833)    
Subordinated debentures (11,096) (11,178)    
Interest rate swaps (1,079) (1,116)    
Accrued interest payable (827) (868)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
        
ASSETS        
Cash and cash equivalents 33,866 29,633    
Interest bearing time deposits with other banks 0 0    
Securities available for sale 990 985    
Trading securities 3,867 3,923    
Loans held for sale 0 0    
Net loans 0 0    
Accrued interest receivable 6 368    
LIABILITIES        
Deposits (1,608,072) (1,569,552)    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable (337) (200)    
Significant Other Observable Inputs (Level 2) [Member]
        
ASSETS        
Cash and cash equivalents 0 0    
Interest bearing time deposits with other banks 225 274    
Securities available for sale 686,074 684,345    
Trading securities 206 204    
Loans held for sale 348 507    
Net loans 0 0    
Accrued interest receivable 4,141 3,302    
LIABILITIES        
Deposits (220,150) (265,237)    
FHLB and other borrowings (91,028) (87,833)    
Subordinated debentures (11,096) (11,178)    
Interest rate swaps (1,079) (1,116)    
Accrued interest payable (475) (653)    
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 798 661    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 1,274,928 1,276,622    
Accrued interest receivable 4,068 4,362    
LIABILITIES        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable $ (15) $ (15)