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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 16,286 $ 16,584 $ 18,772 $ 19,996
Investment securities available-for-sale, at fair value 376,039 387,983    
Bank stocks, at cost 5,025 5,423    
Loans, net 475,497 433,743    
Loans held for sale 7,728 6,535    
Derivative financial instruments 680 395    
Accrued interest receivable 4,768 4,409    
Non-maturity deposits (620,869) (642,281)    
Time deposits (146,407) (123,277)    
FHLB borrowings (60,300) (31,600)    
Subordinated debentures (21,634) (21,484)    
Other borrowings (13,793) (13,509)    
Accrued interest payable (402) (274)    
Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 16,286 16,584    
Investment securities available-for-sale, at fair value 1,943 1,998    
Bank stocks, at cost    
Loans, net    
Loans held for sale    
Derivative financial instruments    
Accrued interest receivable 10 20    
Non-maturity deposits (620,869) (642,281)    
Time deposits    
FHLB borrowings    
Subordinated debentures    
Other borrowings    
Accrued interest payable    
Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents    
Investment securities available-for-sale, at fair value 374,096 385,985    
Bank stocks, at cost    
Loans, net    
Loans held for sale 7,728 6,535    
Derivative financial instruments 680 395    
Accrued interest receivable 1,973 2,234    
Non-maturity deposits    
Time deposits (143,979) (121,298)    
FHLB borrowings (60,304) (31,706)    
Subordinated debentures (19,541) (19,134)    
Other borrowings (13,793) (13,509)    
Accrued interest payable (402) (274)    
Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents    
Investment securities available-for-sale, at fair value    
Bank stocks, at cost    
Loans, net 481,975 436,910    
Loans held for sale    
Derivative financial instruments    
Accrued interest receivable 2,785 2,155    
Non-maturity deposits    
Time deposits    
FHLB borrowings    
Subordinated debentures    
Other borrowings    
Accrued interest payable    
Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 16,286 16,584    
Investment securities available-for-sale, at fair value 376,039 387,983    
Bank stocks, at cost    
Loans, net 481,975 436,910    
Loans held for sale 7,728 6,535    
Derivative financial instruments 680 395    
Accrued interest receivable 4,768 4,409    
Non-maturity deposits (620,869) (642,281)    
Time deposits (143,979) (121,298)    
FHLB borrowings (60,304) (31,706)    
Subordinated debentures (19,541) (19,134)    
Other borrowings (13,793) (13,509)    
Accrued interest payable $ (402) $ (274)