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Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate $ 5,613 $ 7,510
Variable Rate 322,915 232,347
Lines of Credit and Construction Loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 4,982 6,905
Variable Rate 286,925 202,923
Overdraft Protection [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 7 5
Variable Rate 33,353 29,075
Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 624 600
Variable Rate $ 2,637 $ 349