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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Not Measured at Fair Value on a Recurring or Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Financial Assets:        
Cash and due from financial institutions $ 62,219 $ 42,779 $ 64,754 $ 40,519
Other securities 20,280 21,021    
Loans, net of allowance 1,634,496 1,548,262    
Bank owned life insurance 44,745 43,037    
Accrued interest receivable 7,501 6,723    
Financial Liabilities:        
Short-term FHLB advances 181,100 188,600    
Securities sold under agreement to repurchase 15,088 22,199    
Carrying Amount [Member]        
Financial Assets:        
Cash and due from financial institutions 62,219 42,779    
Other securities 20,280 21,021    
Loans, held for sale 8,983 1,391    
Loans, net of allowance 1,634,496 1,548,262    
Bank owned life insurance 44,745 43,037    
Accrued interest receivable 7,501 6,723    
Financial Liabilities:        
Nonmaturing deposits 1,365,695 1,312,207    
Time deposits 266,926 267,686    
Short-term FHLB advances 181,100 188,600    
Long-term FHLB advances 55,000 5,000    
Securities sold under agreement to repurchase 15,088 22,199    
Subordinated debentures 29,427 29,427    
Accrued interest payable 271 230    
Total Fair Value [Member]        
Financial Assets:        
Cash and due from financial institutions 62,219 42,779    
Other securities 20,280 21,021    
Loans, held for sale 9,163 1,391    
Loans, net of allowance 1,647,787 1,517,278    
Bank owned life insurance 44,745 43,037    
Accrued interest receivable 7,501 6,723    
Financial Liabilities:        
Nonmaturing deposits 1,365,695 1,312,207    
Time deposits 267,745 267,943    
Short-term FHLB advances 181,100 188,600    
Long-term FHLB advances 58,364 4,983    
Securities sold under agreement to repurchase 15,088 22,199    
Subordinated debentures 36,415 34,620    
Accrued interest payable 271 230    
(Level 1) [Member]        
Financial Assets:        
Cash and due from financial institutions 62,219 42,779    
Other securities 20,280 21,021    
Loans, held for sale 9,163 1,391    
Bank owned life insurance 44,745 43,037    
Accrued interest receivable 7,501 6,723    
Financial Liabilities:        
Nonmaturing deposits 1,365,695 1,312,207    
Short-term FHLB advances 181,100 188,600    
Securities sold under agreement to repurchase 15,088 22,199    
Accrued interest payable 271 230    
(Level 3) [Member]        
Financial Assets:        
Loans, net of allowance 1,647,787 1,517,278    
Financial Liabilities:        
Time deposits 267,745 267,943    
Long-term FHLB advances 58,364 4,983    
Subordinated debentures $ 36,415 $ 34,620