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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
ASSETS        
Cash and cash equivalents $ 25,577 $ 27,261 $ 51,635 $ 27,928
Securities available for sale 538,721 546,043    
Trading securities 4,692 4,576    
Loans held for sale 544 1,381    
Net loans 1,589,570 1,561,061    
FHLB and other equity interests 13,675 15,921    
Liabilities        
Deposits (1,890,211) (1,815,053)    
Subordinated debentures (20,620) (20,620)    
Carrying Amount [Member]        
ASSETS        
Cash and cash equivalents 25,577 27,261    
Securities available for sale 538,721 546,043    
Trading securities 4,692 4,576    
Loans held for sale 544 1,381    
Net loans 1,589,570 1,561,061    
FHLB and other equity interests 13,675 15,921    
Interest rate swaps 462 131    
Accrued interest receivable 7,609 7,312    
Liabilities        
Deposits (1,890,211) (1,815,053)    
FHLB and other borrowings (156,150) (220,515)    
Subordinated debentures (20,620) (20,620)    
Interest rate swaps (1,237) (867)    
Accrued interest payable (820) (766)    
Total Fair Value [Member]        
ASSETS        
Cash and cash equivalents 25,577 27,261    
Securities available for sale 538,721 546,043    
Trading securities 4,692 4,576    
Loans held for sale 546 1,438    
Net loans 1,598,865 1,554,502    
Interest rate swaps 462 131    
Accrued interest receivable 7,609 7,312    
Liabilities        
Deposits (1,890,175) (1,813,916)    
FHLB and other borrowings (155,165) (218,808)    
Subordinated debentures (11,802) (11,761)    
Interest rate swaps (1,237) (867)    
Accrued interest payable (820) (766)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
ASSETS        
Cash and cash equivalents 25,577 27,261    
Securities available for sale 993 981    
Trading securities 4,637 4,522    
Loans held for sale 0 0    
Net loans 0 0    
Interest rate swaps 0 0    
Accrued interest receivable 6 5    
Liabilities        
Deposits (1,700,606) (1,630,888)    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable (334) (344)    
Significant Other Observable Inputs (Level 2) [Member]        
ASSETS        
Cash and cash equivalents 0 0    
Securities available for sale 534,619 541,649    
Trading securities 55 54    
Loans held for sale 546 1,438    
Net loans 0 0    
Interest rate swaps 462 131    
Accrued interest receivable 3,170 2,875    
Liabilities        
Deposits (189,569) (183,028)    
FHLB and other borrowings (155,165) (218,808)    
Subordinated debentures (11,802) (11,761)    
Interest rate swaps (1,237) (867)    
Accrued interest payable (467) (404)    
Significant Unobservable Inputs (Level 3) [Member]        
ASSETS        
Cash and cash equivalents 0 0    
Securities available for sale 3,109 3,413    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 1,598,865 1,554,502    
Interest rate swaps 0 0    
Accrued interest receivable 4,433 4,432    
Liabilities        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest rate swaps 0 0    
Accrued interest payable $ (19) $ (18)