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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
ASSETS        
Cash and cash equivalents $ 28,604 $ 35,345 $ 28,369 $ 29,183
Securities available for sale 418,299 409,709    
Trading securities 7,256 7,150    
Loans held for sale 1,460 852    
Net loans 2,255,368 2,126,266    
Liabilities        
Deposits (2,210,055) (2,167,815)    
Subordinated debentures (70,620) (70,620)    
Carrying Amount [Member]        
ASSETS        
Cash and cash equivalents 28,604 35,345    
Securities available for sale 418,299 409,709    
Trading securities 7,256 7,150    
Loans held for sale 1,460 852    
Net loans 2,255,368 2,126,266    
FHLB and other restricted interests 21,377 17,035    
Other equity interests 5,187 4,482    
Interest rate swaps 146 149    
Accrued interest receivable 9,853 9,254    
Liabilities        
Deposits (2,210,055) (2,167,815)    
FHLB and other borrowings (356,398) (257,359)    
Subordinated debentures (70,620) (70,620)    
Interest rate swaps (229) (310)    
Accrued interest payable (638) (554)    
Total Fair Value [Member]        
ASSETS        
Cash and cash equivalents 28,604 35,345    
Securities available for sale 418,299 409,709    
Trading securities 7,256 7,150    
Loans held for sale 1,460 853    
Net loans 2,226,877 2,126,824    
Other equity interests 5,187 4,482    
Interest rate swaps 146 149    
Accrued interest receivable 9,853 9,254    
Liabilities        
Deposits (2,212,220) (2,165,600)    
FHLB and other borrowings (351,547) (257,361)    
Subordinated debentures (69,767) (63,575)    
Interest rate swaps (229) (310)    
Accrued interest payable (638) (554)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
ASSETS        
Cash and cash equivalents 28,604 35,345    
Securities available for sale 943 962    
Trading securities 7,204 7,098    
Loans held for sale 0 0    
Net loans 0 0    
Interest rate swaps 0 0    
Accrued interest receivable 7 6    
Liabilities        
Deposits (1,833,235) (1,802,844)    
FHLB and other borrowings 0 0    
Subordinated debentures 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 417,356 408,747    
Trading securities 52 52    
Loans held for sale 1,460 853    
Net loans 0 0    
Interest rate swaps 146 149    
Accrued interest receivable 3,117 2,651    
Liabilities        
Deposits (378,985) (362,756)    
FHLB and other borrowings (351,547) (257,361)    
Subordinated debentures (69,767) (63,575)    
Interest rate swaps (229) (310)    
Accrued interest payable (638) (554)    
Significant Unobservable Inputs (Level 3) [Member]        
ASSETS        
Cash and cash equivalents 0 0    
Securities available for sale 0 0    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 2,226,877 2,126,824    
Interest rate swaps 0 0    
Accrued interest receivable 6,729 6,597    
Liabilities        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable $ 0 $ 0