Investments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Security	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	$ 279,897		$ 312,039
Gross Unrealized Gains	2,734		3,087
Gross Unrealized Losses	(858)		(1,109)
Fair Value	$ 281,773		314,017
Number of securities owned with fair value less than cost | Security	80
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	$ 103,699		106,062
Twelve Months or Greater, Fair Value	5,276		1,520
Total, Fair Value	108,975		107,582
Less than Twelve Months, Gross Unrealized Losses	(763)		(1,071)
Twelve Months or Greater, Gross Unrealized Losses	(95)		(38)
Total, Gross Unrealized Losses	(858)		(1,109)
Proceeds from sale of securities available-for-sale	18,766	$ 5,020
Realized investment gains (losses) [Abstract]
Gross gains	172	27
Gross losses	0	0
Net gains	172	$ 27
Investment securities pledged as collateral	206,500		206,300
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	36,081
Due after one year through five years	141,531
Due after five years through ten years	38,172
Due after ten years	63,214
Total	278,998
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	36,288
Due after one year through five years	142,341
Due after five years through ten years	38,283
Due after ten years	63,202
Total	$ 280,114
Minimum [Member]
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Duration securities impaired	1 year
U.S. Agency Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	$ 147,624		170,276
Gross Unrealized Gains	297		407
Gross Unrealized Losses	(263)		(269)
Fair Value	147,658		170,414
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	61,938		50,947
Twelve Months or Greater, Fair Value	0		0
Total, Fair Value	61,938		50,947
Less than Twelve Months, Gross Unrealized Losses	(263)		(269)
Twelve Months or Greater, Gross Unrealized Losses	0		0
Total, Gross Unrealized Losses	(263)		(269)
U.S. Treasury Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost			2,999
Gross Unrealized Gains			1
Gross Unrealized Losses			0
Fair Value			3,000
Obligations of State and Political Subdivisions [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	87,082		95,956
Gross Unrealized Gains	1,500		1,463
Gross Unrealized Losses	(339)		(493)
Fair Value	88,243		96,926
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	18,733		28,398
Twelve Months or Greater, Fair Value	2,117		767
Total, Fair Value	20,850		29,165
Less than Twelve Months, Gross Unrealized Losses	(279)		(472)
Twelve Months or Greater, Gross Unrealized Losses	(60)		(21)
Total, Gross Unrealized Losses	(339)		(493)
Corporate Obligations [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	3,000		3,000
Gross Unrealized Gains	95		50
Gross Unrealized Losses	0		0
Fair Value	3,095		3,050
Mortgage-backed Securities in Government Sponsored Entities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	41,292		37,987
Gross Unrealized Gains	82		88
Gross Unrealized Losses	(256)		(347)
Fair Value	41,118		37,728
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	23,028		26,717
Twelve Months or Greater, Fair Value	3,159		753
Total, Fair Value	26,187		27,470
Less than Twelve Months, Gross Unrealized Losses	(221)		(330)
Twelve Months or Greater, Gross Unrealized Losses	(35)		(17)
Total, Gross Unrealized Losses	(256)		(347)
Equity Securities in Financial Institutions [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]
Amortized Cost	899		1,821
Gross Unrealized Gains	760		1,078
Gross Unrealized Losses	0		0
Fair Value	$ 1,659		$ 2,899