Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Financial assets [Abstract]
Interest bearing time deposits with other banks	$ 6,955	$ 7,696
Available-for-sale securities	$ 349,154	359,737
Financial liabilities [Abstract]
Consideration period for recognition of cash and due from banks	90 days
Consideration period for recognition of accrued interest receivable and payable	90 days
Level I [Member]
Financial assets [Abstract]
Cash and due from banks	$ 16,371	24,384
Interest bearing time deposits with other banks	0	0
Available-for-sale securities	7,738	12,514
Loans held for sale	576	603
Net loans	0	0
Bank owned life insurance	26,050	25,535
Regulatory stock	4,139	3,459
Accrued interest receivable	3,988	4,211
Financial liabilities [Abstract]
Deposits	742,676	706,121
Borrowed funds	12,740	1,598
Accrued interest payable	636	734
Level II [Member]
Financial assets [Abstract]
Cash and due from banks	0	0
Interest bearing time deposits with other banks	0	0
Available-for-sale securities	341,416	347,223
Net loans	0	0
Bank owned life insurance	0	0
Regulatory stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	0	0
Borrowed funds	0	0
Accrued interest payable	0	0
Level III [Member]
Financial assets [Abstract]
Cash and due from banks	0	0
Interest bearing time deposits with other banks	6,961	7,705
Available-for-sale securities		0
Net loans	764,383	712,524
Bank owned life insurance	0	0
Regulatory stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	267,201	281,421
Borrowed funds	37,934	37,265
Accrued interest payable	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and due from banks	16,371	24,384
Interest bearing time deposits with other banks	6,955	7,696
Available-for-sale securities	349,154	359,737
Loans held for sale	576	603
Net loans	743,099	687,925
Bank owned life insurance	26,050	25,535
Regulatory stock	4,139	3,459
Accrued interest receivable	3,988	4,211
Financial liabilities [Abstract]
Deposits	1,008,747	988,031
Borrowed funds	51,859	41,631
Accrued interest payable	636	734
Fair Value [Member]
Financial assets [Abstract]
Cash and due from banks	16,371	24,384
Interest bearing time deposits with other banks	6,961	7,705
Available-for-sale securities	349,154	359,737
Loans held for sale	576	603
Net loans	764,383	712,524
Bank owned life insurance	26,050	25,535
Regulatory stock	4,139	3,459
Accrued interest receivable	3,988	4,211
Financial liabilities [Abstract]
Deposits	1,009,877	987,542
Borrowed funds	50,674	38,863
Accrued interest payable	$ 636	$ 734