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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Cash and cash equivalents $ 35,345 $ 29,183 $ 27,261 $ 27,928
Securities available for sale 409,709 495,835    
Trading securities 7,150 4,858    
Loans held for sale 852 7,528    
Net loans 2,126,266 1,857,206    
FHLB and other equity interests 21,517 19,186    
Liabilities        
Deposits (2,167,815) (2,017,522)    
Subordinated debentures (70,620) (70,620)    
Deposits held for sale 0 (6,456)    
Carrying Amount [Member]        
ASSETS        
Cash and cash equivalents 35,345 29,183    
Securities available for sale 409,709 495,835    
Trading securities 7,150 4,858    
Loans held for sale 852 7,528    
Net loans 2,126,266 1,857,206    
FHLB and other equity interests 21,517 19,186    
Interest rate swaps 149 211    
Accrued interest receivable 9,254 8,264    
Liabilities        
Deposits (2,167,815) (2,017,522)    
FHLB and other borrowings (257,359) (237,004)    
Subordinated debentures (70,620) (70,620)    
Deposits held for sale 0 (6,456)    
Interest rate swaps (310) (670)    
Accrued interest payable (554) (510)    
Total Fair Value [Member]        
ASSETS        
Cash and cash equivalents 35,345 29,183    
Securities available for sale 409,709 495,835    
Trading securities 7,150 4,858    
Loans held for sale 853 7,553    
Net loans 2,126,824 1,817,341    
Interest rate swaps 149 211    
Accrued interest receivable 9,254 8,264    
Liabilities        
Deposits (2,165,600) (2,005,414)    
FHLB and other borrowings (257,361) (226,769)    
Subordinated debentures (63,575) (61,831)    
Deposits held for sale 0 (6,417)    
Interest rate swaps (310) (670)    
Accrued interest payable (554) (510)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
ASSETS        
Cash and cash equivalents 35,345 29,183    
Securities available for sale 962 971    
Trading securities 7,098 4,805    
Loans held for sale 0 0    
Net loans 0 0    
Interest rate swaps 0 0    
Accrued interest receivable 6 6    
Liabilities        
Deposits (1,802,844) (1,785,649)    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Deposits held for sale 0 0    
Interest rate swaps 0 0    
Accrued interest payable 0 0    
Significant Other Observable Inputs (Level 2) [Member]        
ASSETS        
Cash and cash equivalents 0 0    
Securities available for sale 408,747 492,815    
Trading securities 52 53    
Loans held for sale 853 7,553    
Net loans 0 0    
Interest rate swaps 149 211    
Accrued interest receivable 2,651 3,014    
Liabilities        
Deposits (362,756) (219,765)    
FHLB and other borrowings (257,361) (226,769)    
Subordinated debentures (63,575) (61,831)    
Deposits held for sale 0 (6,417)    
Interest rate swaps (310) (670)    
Accrued interest payable (554) (510)    
Significant Unobservable Inputs (Level 3) [Member]        
ASSETS        
Cash and cash equivalents 0 0    
Securities available for sale 0 2,049    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 2,126,824 1,817,341    
Interest rate swaps 0 0    
Accrued interest receivable 6,597 5,244    
Liabilities        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Deposits held for sale 0 0    
Interest rate swaps 0 0    
Accrued interest payable $ 0 $ 0