Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Financial assets [Abstract]
Available-for-sale securities	$ 371,925	$ 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	$ 37,379	24,384
Interest bearing time deposits with other banks	0	0
Available-for-sale securities	7,423	12,514
Loans held for sale	1,557	603
Net loans	0	0
Bank owned life insurance	25,705	25,535
Regulatory stock	3,347	3,459
Accrued interest receivable	4,096	4,211
Financial liabilities [Abstract]
Deposits	742,069	706,121
Borrowed funds	0	1,598
Accrued interest payable	660	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	364,502	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	7,705	7,705
Available-for-sale securities		0
Net loans	714,301	712,524
Bank owned life insurance	0	0
Regulatory stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	276,900	281,421
Borrowed funds	38,068	37,265
Accrued interest payable	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and due from banks	37,379	24,384
Interest bearing time deposits with other banks	7,697	7,696
Available-for-sale securities	371,925	359,737
Loans held for sale	1,557	603
Net loans	692,428	687,925
Bank owned life insurance	25,705	25,535
Regulatory stock	3,347	3,459
Accrued interest receivable	4,096	4,211
Financial liabilities [Abstract]
Deposits	1,017,811	988,031
Borrowed funds	39,996	41,631
Accrued interest payable	660	734
Fair Value [Member]
Financial assets [Abstract]
Cash and due from banks	37,379	24,384
Interest bearing time deposits with other banks	7,705	7,705
Available-for-sale securities	371,925	359,737
Loans held for sale	1,557	603
Net loans	714,301	712,524
Bank owned life insurance	25,705	25,535
Regulatory stock	3,347	3,459
Accrued interest receivable	4,096	4,211
Financial liabilities [Abstract]
Deposits	1,018,969	987,542
Borrowed funds	38,068	38,863
Accrued interest payable	$ 660	$ 734