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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Carried at Amortized Cost (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Assets:      
Cash and due from financial institutions $ 128,222,000 $ 48,535,000  
Other securities 20,537,000 20,280,000  
Loans, net of allowance for loan losses 2,032,474,000 1,694,203,000  
Bank owned life insurance 45,976,000 44,999,000  
Accrued interest receivable 9,421,000 7,093,000  
Financial Liabilities:      
Time deposits 286,838,000    
Short-term FHLB advances 125,000,000 101,500,000  
Long-term FHLB advances 125,000,000 125,000,000  
Securities sold under agreement to repurchase 28,914,000 18,674,000 $ 22,199,000
Carrying Amount [Member]      
Financial Assets:      
Cash and due from financial institutions 139,522,000 48,535,000  
Other securities 20,537,000 20,280,000  
Loans, held for sale 7,001,000 2,285,000  
Loans, net of allowance for loan losses 2,032,474,000 1,694,203,000  
Bank owned life insurance 45,976,000 44,999,000  
Accrued interest receivable 9,421,000 7,093,000  
Financial Liabilities:      
Nonmaturing deposits 1,902,560,000 1,402,924,000  
Time deposits 286,838,000 275,840,000  
Short-term FHLB advances   101,500,000  
Long-term FHLB advances 125,000,000 125,000,000  
Securities sold under agreement to repurchase 28,914,000 18,674,000  
Subordinated debentures 29,427,000 29,427,000  
Accrued interest payable 204,000 277,000  
Total Fair Value [Member]      
Financial Assets:      
Cash and due from financial institutions 139,522,000 48,535,000  
Other securities 20,537,000 20,280,000  
Loans, held for sale 7,141,000 2,331,000  
Loans, net of allowance for loan losses 2,063,249,000 1,713,863,000  
Bank owned life insurance 45,976,000 44,999,000  
Accrued interest receivable 9,421,000 7,093,000  
Financial Liabilities:      
Nonmaturing deposits 1,902,560,000 1,402,924,000  
Time deposits 288,298,000 276,616,000  
Short-term FHLB advances   101,500,000  
Long-term FHLB advances 130,942,000 123,893,000  
Securities sold under agreement to repurchase 28,914,000 18,674,000  
Subordinated debentures 31,479,000 34,452,000  
Accrued interest payable 204,000 277,000  
(Level 1) [Member]      
Financial Assets:      
Cash and due from financial institutions 139,522,000 48,535,000  
Other securities 20,537,000 20,280,000  
Loans, held for sale 7,141,000 2,331,000  
Bank owned life insurance 45,976,000 44,999,000  
Accrued interest receivable 9,421,000 7,093,000  
Financial Liabilities:      
Nonmaturing deposits 1,902,560,000 1,402,924,000  
Short-term FHLB advances   101,500,000  
Securities sold under agreement to repurchase 28,914,000 18,674,000  
Accrued interest payable 204,000 277,000  
(Level 3) [Member]      
Financial Assets:      
Loans, net of allowance for loan losses 2,063,249,000 1,713,863,000  
Financial Liabilities:      
Time deposits 288,298,000 276,616,000  
Long-term FHLB advances 130,942,000 123,893,000  
Subordinated debentures $ 31,479,000 $ 34,452,000