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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial assets:        
Available-for-sale investment securities $ 477,554,000 $ 432,535,000    
Held-to-maturity Securities 31,712,000 31,964,000    
Valuation allowance 9,610,000 8,308,000 $ 9,208,000 $ 10,133,000
Carrying Value        
Financial assets:        
Cash and due from banks 23,339,000 21,316,000    
Interest-earning deposits in other banks 70,988,000 55,646,000    
Federal funds sold 290,000 366,000    
Available-for-sale investment securities 477,554,000 432,535,000    
Held-to-maturity Securities 31,712,000 31,964,000    
Loans, net 588,501,000 564,280,000    
Federal Home Loan Bank stock 4,823,000 4,791,000    
Accrued interest receivable 6,355,000 5,793,000    
Financial liabilities:        
Deposits 1,116,267,000 1,039,152,000    
Junior subordinated deferrable interest debentures 5,155,000 5,155,000    
Accrued interest payable 101,000 114,000    
Level 1        
Financial assets:        
Cash and due from banks 23,339,000 21,316,000    
Interest-earning deposits in other banks 70,988,000 55,646,000    
Federal funds sold 290,000 366,000    
Available-for-sale investment securities 7,536,000 7,585,000    
Held-to-maturity Securities 0 0    
Loans, net 0 0    
Accrued interest receivable 27,000 25,000    
Financial liabilities:        
Deposits 976,433,000 885,704,000    
Junior subordinated deferrable interest debentures 0 0    
Accrued interest payable 0 0    
Level 2        
Financial assets:        
Cash and due from banks 0 0    
Interest-earning deposits in other banks 0 0    
Federal funds sold 0 0    
Available-for-sale investment securities 470,018,000 424,950,000    
Held-to-maturity Securities 35,142,000 35,000    
Loans, net 0 0    
Accrued interest receivable 3,414,000 3,212,000    
Financial liabilities:        
Deposits 139,353,000 153,475,000    
Junior subordinated deferrable interest debentures 0 0    
Accrued interest payable 76,000 90,000    
Level 3        
Financial assets:        
Cash and due from banks 0 0    
Interest-earning deposits in other banks 0 0    
Federal funds sold 0 0    
Available-for-sale investment securities 0 0    
Held-to-maturity Securities 0 0    
Loans, net 585,737,000 564,667,000    
Accrued interest receivable 2,914,000 2,556,000    
Financial liabilities:        
Deposits 0 0    
Junior subordinated deferrable interest debentures 3,200,000 3,119,000    
Accrued interest payable 25,000 24,000    
Fair Value        
Financial assets:        
Cash and due from banks 23,339,000 21,316,000    
Interest-earning deposits in other banks 70,988,000 55,646,000    
Federal funds sold 290,000 366,000    
Available-for-sale investment securities 477,554,000 432,535,000    
Held-to-maturity Securities 35,142,000 35,000    
Loans, net 585,737,000 564,667,000    
Accrued interest receivable 6,355,000 5,793,000    
Valuation allowance 0 3,921,000    
Financial liabilities:        
Deposits 1,115,786,000 1,039,179,000    
Junior subordinated deferrable interest debentures 3,200,000 3,119,000    
Accrued interest payable 101,000 114,000    
Allowance for Loan and Lease Losses, Write-offs $ 0 $ 3,539,000