Investments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Security	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Securities [Abstract]
Amortized cost	$ 244,342		$ 242,242
Gross unrealized gains	1,389		752
Gross unrealized losses	(1,294)		(1,984)
Fair value	$ 244,437		241,010
Number of securities owned with fair value less than cost | Security	84
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	$ 0		25,180
Twelve months or greater, Fair value	118,424		126,094
Total, Fair value	118,424		151,274
Less than twelve months, Gross unrealized losses	0		(76)
Twelve months or greater, Gross unrealized losses	(1,294)		(1,908)
Total, Gross Unrealized Losses	(1,294)		(1,984)
Proceeds from sale of securities available-for-sale	0	$ 0
Equity Securities [Abstract]
Net gains (losses) recognized in equity securities during the period	11	6
Less: Net gains realized on the sale of equity securities during the period	0	0
Net unrealized gains (losses)	11	$ 6
Investment securities pledged as collateral	210,200		221,200
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	25,824
Due after one year through five years	110,098
Due after five years through ten years	50,487
Due after ten years	57,933
Amortized cost	244,342		242,242
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	25,698
Due after one year through five years	110,052
Due after five years through ten years	50,803
Due after ten years	57,884
Fair value	244,437		241,010
U.S. Agency Securities [Member]
Debt Securities [Abstract]
Amortized cost	102,388		106,516
Gross unrealized gains	940		509
Gross unrealized losses	(464)		(640)
Fair value	102,864		106,385
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	0		5,981
Twelve months or greater, Fair value	44,321		52,673
Total, Fair value	44,321		58,654
Less than twelve months, Gross unrealized losses	0		(5)
Twelve months or greater, Gross unrealized losses	(464)		(635)
Total, Gross Unrealized Losses	(464)		(640)
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Amortized cost	102,388		106,516
Available-for-Sale Debt Securities, Fair Value [Abstract]
Fair value	102,864		106,385
U.S. Treasury Securities [Member]
Debt Securities [Abstract]
Amortized cost	33,828		33,813
Gross unrealized gains	0		0
Gross unrealized losses	(321)		(455)
Fair value	33,507		33,358
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	0		4,948
Twelve months or greater, Fair value	33,507		28,410
Total, Fair value	33,507		33,358
Less than twelve months, Gross unrealized losses	0		(31)
Twelve months or greater, Gross unrealized losses	(321)		(424)
Total, Gross Unrealized Losses	(321)		(455)
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Amortized cost	33,828		33,813
Available-for-Sale Debt Securities, Fair Value [Abstract]
Fair value	33,507		33,358
Obligations of State and Political Subdivisions [Member]
Debt Securities [Abstract]
Amortized cost	60,375		52,074
Gross unrealized gains	267		150
Gross unrealized losses	(44)		(177)
Fair value	60,598		52,047
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	0		8,979
Twelve months or greater, Fair value	8,070		12,441
Total, Fair value	8,070		21,420
Less than twelve months, Gross unrealized losses	0		(22)
Twelve months or greater, Gross unrealized losses	(44)		(155)
Total, Gross Unrealized Losses	(44)		(177)
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Amortized cost	60,375		52,074
Available-for-Sale Debt Securities, Fair Value [Abstract]
Fair value	60,598		52,047
Corporate Obligations [Member]
Debt Securities [Abstract]
Amortized cost	3,000		3,000
Gross unrealized gains	39		34
Gross unrealized losses	0		0
Fair value	3,039		3,034
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Amortized cost	3,000		3,000
Available-for-Sale Debt Securities, Fair Value [Abstract]
Fair value	3,039		3,034
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities [Abstract]
Amortized cost	44,751		46,839
Gross unrealized gains	143		59
Gross unrealized losses	(465)		(712)
Fair value	44,429		46,186
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	0		5,272
Twelve months or greater, Fair value	32,526		32,570
Total, Fair value	32,526		37,842
Less than twelve months, Gross unrealized losses	0		(18)
Twelve months or greater, Gross unrealized losses	(465)		(694)
Total, Gross Unrealized Losses	(465)		(712)
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Amortized cost	44,751		46,839
Available-for-Sale Debt Securities, Fair Value [Abstract]
Fair value	$ 44,429		$ 46,186