Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financial assets [Abstract]
Interest bearing time deposits with other banks	$ 6,954	$ 7,696
Available-for-sale securities	$ 360,944	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	$ 26,822	24,384
Interest bearing time deposits with other banks	0	0
Available-for-sale securities	7,567	12,514
Loans held for sale	1,304	603
Net loans	0	0
Bank owned life insurance	25,877	25,535
Regulatory stock	3,407	3,459
Accrued interest receivable	4,176	4,211
Financial liabilities [Abstract]
Deposits	734,593	706,121
Borrowed funds	0	1,598
Accrued interest payable	644	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	353,377	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	726,584	712,524
Bank owned life insurance	0	0
Regulatory stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	270,565	281,421
Borrowed funds	37,240	37,265
Accrued interest payable	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and due from banks	26,822	24,384
Interest bearing time deposits with other banks	6,954	7,696
Available-for-sale securities	360,944	359,737
Loans held for sale	1,304	603
Net loans	701,756	687,925
Bank owned life insurance	25,877	25,535
Regulatory stock	3,407	3,459
Accrued interest receivable	4,176	4,211
Financial liabilities [Abstract]
Deposits	1,003,482	988,031
Borrowed funds	38,786	41,631
Accrued interest payable	644	734
Fair Value [Member]
Financial assets [Abstract]
Cash and due from banks	26,822	24,384
Interest bearing time deposits with other banks	6,961	7,705
Available-for-sale securities	360,944	359,737
Loans held for sale	1,304	603
Net loans	726,584	712,524
Bank owned life insurance	25,877	25,535
Regulatory stock	3,407	3,459
Accrued interest receivable	4,176	4,211
Financial liabilities [Abstract]
Deposits	1,005,158	987,542
Borrowed funds	37,240	38,863
Accrued interest payable	$ 644	$ 734