Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Assets [Abstract]
Available-for-sale Securities	$ 155,508	$ 169,854
Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	25,108	21,230
Available-for-sale Securities	26	26
Other investment	0	0
Federal Home Loan Bank stock	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Financial Liabilities
Demand deposits	0	0
NOW and money markets	0	0
Savings	0	0
Time deposits	0	0
Short-term borrowings	15,000	19,000
Long-term borrowings	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Level 2 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	0	0
Available-for-sale Securities	153,776	168,007
Other investment	0	0
Federal Home Loan Bank stock	0	0
Loans, net	0	0
Accrued interest receivable	2,975	3,968
Financial Liabilities
Demand deposits	97,076	97,859
NOW and money markets	196,999	213,140
Savings	81,814	85,170
Time deposits	251,078	233,288
Short-term borrowings	0	0
Long-term borrowings	60,066	84,617
Subordinated debt	25,836	26,538
Accrued interest payable	2,378	711
Level 3 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	0	0
Available-for-sale Securities	1,706	1,821
Other investment	2,250	2,250
Federal Home Loan Bank stock	2,036	3,216
Loans, net	574,105	578,732
Accrued interest receivable	0	0
Financial Liabilities
Demand deposits	0	0
NOW and money markets	0	0
Savings	0	0
Time deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and cash equivalents	25,108	21,230
Available-for-sale Securities	155,508	169,854
Other investment	2,250	2,250
Federal Home Loan Bank stock	2,036	3,216
Loans, net	584,442	591,589
Accrued interest receivable	2,975	3,968
Financial Liabilities
Demand deposits	97,076	97,859
NOW and money markets	196,999	213,140
Savings	81,814	85,170
Time deposits	251,177	233,377
Short-term borrowings	15,000	19,000
Long-term borrowings	60,000	85,000
Subordinated debt	25,774	25,774
Accrued interest payable	2,378	711
Estimated Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	25,108	21,230
Available-for-sale Securities	155,508	169,854
Other investment	2,250	2,250
Federal Home Loan Bank stock	2,036	3,216
Loans, net	574,105	578,732
Accrued interest receivable	2,975	3,968
Financial Liabilities
Demand deposits	97,076	97,859
NOW and money markets	196,999	213,140
Savings	81,814	85,170
Time deposits	251,078	233,288
Short-term borrowings	15,000	19,000
Long-term borrowings	60,066	84,617
Subordinated debt	25,836	26,538
Accrued interest payable	2,378	711
Interest Rate Swap | Level 1 [Member]
Financial Liabilities
Derivative Liability	0	0
Interest Rate Swap | Level 2 [Member]
Financial Liabilities
Derivative Liability	408	494
Interest Rate Swap | Level 3 [Member]
Financial Liabilities
Derivative Liability	0	0
Interest Rate Swap | Carrying Amount [Member]
Financial Liabilities
Derivative Liability	408	494
Interest Rate Swap | Estimated Fair Value [Member]
Financial Liabilities
Derivative Liability	$ 408	$ 494