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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value, by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying amount $ 18,772 $ 19,996 $ 17,650 $ 13,569
Cash and cash equivalents 18,772 19,996    
Investment securities available for sale 389,388 385,563    
Bank stocks, at cost 5,350 5,299    
Loans, net, carrying amount 428,439 420,461    
Loans, net 426,935      
Loans held for sale, net, carrying amount 8,583 5,517    
Loans held for sale, net 8,583 5,517    
Derivative financial instruments 583 662    
Accrued interest receivable, carrying amount 4,406 4,240    
Non-maturity deposits, carrying amount (605,759) (601,683)    
Time deposits, carrying amount (127,251) (139,838)    
FHLB borrowings, carrying amount (64,400) (39,100)    
Subordinated debentures, carrying amount (21,434) (21,284)    
Other borrowings, carrying amount (11,487) (12,483)    
Accrued interest payable, carrying amount (270) (268)    
Derivative financial instruments (32)      
Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying amount 18,772 19,996    
Cash and cash equivalents 18,772      
Investment securities available for sale 389,388 385,563    
Bank stocks, at cost 5,384    
Loans, net, carrying amount 428,439 417,957    
Loans, net 428,439      
Loans held for sale, net, carrying amount 8,583 5,517    
Loans held for sale, net 8,583      
Derivative financial instruments 583 662    
Accrued interest receivable, carrying amount 4,406 4,240    
Non-maturity deposits, carrying amount (605,759) (601,683)    
Time deposits, carrying amount (127,251) (138,623)    
FHLB borrowings, carrying amount (64,400) (35,695)    
Subordinated debentures, carrying amount (21,434) (18,608)    
Other borrowings, carrying amount (11,487) (12,483)    
Accrued interest payable, carrying amount (270) (268)    
Derivative financial instruments (32)      
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 18,772 19,996    
Investment securities available for sale 5,337 7,123    
Bank stocks, at cost    
Loans, net    
Loans held for sale, net    
Derivative financial instruments    
Accrued interest receivable 16 21    
Non-maturity deposits (605,759) (601,683)    
Time deposits    
FHLB borrowings    
Subordinated debentures    
Other borrowings    
Derivative financial instruments      
Accrued interest payable    
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents    
Investment securities available for sale 384,051 378,440    
Bank stocks, at cost    
Loans, net    
Loans held for sale, net 8,583 5,517    
Derivative financial instruments 583 662    
Accrued interest receivable 2,034 2,104    
Non-maturity deposits    
Time deposits (125,676) (138,623)    
FHLB borrowings (64,646) (35,695)    
Subordinated debentures (19,156) (18,608)    
Other borrowings (11,487) (12,483)    
Derivative financial instruments (32)      
Accrued interest payable (270) (268)    
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents    
Investment securities available for sale    
Bank stocks, at cost    
Loans, net 426,935 417,957    
Loans held for sale, net    
Derivative financial instruments    
Accrued interest receivable 2,356 2,115    
Non-maturity deposits    
Time deposits    
FHLB borrowings    
Subordinated debentures    
Other borrowings    
Derivative financial instruments      
Accrued interest payable