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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
ASSETS    
Securities available for sale $ 522,334 $ 409,709
Net loans 2,364,445 2,126,266
LIABILITIES    
Deposits (2,522,379) (2,167,815)
Subordinated debentures (70,620) (70,620)
Carrying Amount    
ASSETS    
Cash and cash equivalents 36,500 35,345
Securities available for sale 522,334 409,709
Trading securities 8,887 7,150
Loans held for sale 775 852
Net loans 2,364,445 2,126,266
FHLB and other restricted interests 16,885 17,035
Other equity interests 6,951 4,482
Interest rate swaps 191 149
Accrued interest receivable 11,221 9,254
LIABILITIES    
Deposits (2,522,379) (2,167,815)
FHLB and other borrowings (252,422) (257,359)
Subordinated debentures (70,620) (70,620)
Interest rate swaps (182) (310)
Accrued interest payable (820) (554)
Fair Value    
ASSETS    
Cash and cash equivalents 36,500 35,345
Securities available for sale 522,334 409,709
Trading securities 8,887 7,150
Loans held for sale 775 853
Net loans 2,334,576 2,126,824
Other equity interests 6,951 4,482
Interest rate swaps 191 149
Accrued interest receivable 11,221 9,254
LIABILITIES    
Deposits (2,524,617) (2,165,600)
FHLB and other borrowings (248,986) (257,361)
Subordinated debentures (68,202) (63,575)
Interest rate swaps (182) (310)
Accrued interest payable (820) (554)
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
ASSETS    
Cash and cash equivalents 36,500 35,345
Securities available for sale 926 962
Trading securities 8,836 7,098
Loans held for sale 0 0
Net loans 0 0
Interest rate swaps 0 0
Accrued interest receivable 7 6
LIABILITIES    
Deposits (2,132,769) (1,802,844)
FHLB and other borrowings 0 0
Subordinated debentures 0 0
Interest rate swaps 0 0
Accrued interest payable 0 0
Fair Value | Significant Other Observable Inputs (Level 2)    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale 521,408 408,747
Trading securities 51 52
Loans held for sale 775 853
Net loans 0 0
Interest rate swaps 191 149
Accrued interest receivable 3,748 2,651
LIABILITIES    
Deposits (391,848) (362,756)
FHLB and other borrowings (248,986) (257,361)
Subordinated debentures (68,202) (63,575)
Interest rate swaps (182) (310)
Accrued interest payable (820) (554)
Fair Value | Significant Unobservable Inputs (Level 3)    
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 2,334,576 2,126,824
Interest rate swaps 0 0
Accrued interest receivable 7,466 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