Securities (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) security	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) security	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) security
Securities available for sale
Securities available for sale, Percent	100.00%		100.00%		100.00%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 304,183		$ 304,183		$ 321,660
Gross Unrealized Gains	4,232		4,232		402
Gross Unrealized (Losses)	(363)		(363)		(3,136)
Amortized Cost
Due in one year or less	44,295		44,295
Due after one year through five years	178,806		178,806
Due after five years through ten years	79,446		79,446
Due over ten years	1,636		1,636
Fair Value
Due in one year or less	44,233		44,233
Due after one year through five years	180,869		180,869
Due after five years through ten years	81,234		81,234
Due over ten years	1,716		1,716
Carrying value of investment securities pledged to collateralize short-term borrowings	308,052		308,052		$ 318,926
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Sales proceeds			4,881	$ 0
Gross realized gains			0	0
Gross realized losses	$ 52	$ 0	$ 52	$ 0
Less than 12 months
Number of securities | security	41		41		119
Fair Value	$ 10,735		$ 10,735		$ 45,666
Unrealized Loss	$ (61)		$ (61)		$ (211)
Percentage	0.57%		0.57%		0.46%
12 months or more
Number of securities | security	114		114		358
Fair Value	$ 60,872		$ 60,872		$ 159,235
Unrealized Loss	$ (302)		$ (302)		$ (2,925)
Percentage	0.50%		0.50%		1.84%
Total
Number of securities | security	155		155		477
Fair Value	$ 71,607		$ 71,607		$ 204,901
Unrealized Loss	$ (363)		$ (363)		$ (3,136)
Percentage	0.51%		0.51%		1.53%
Collateralized Securities [Member]
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 12,520		$ 12,520
U.S. Treasury [Member]
Securities available for sale
Securities available for sale, Percent	32.63%		32.63%		26.07%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 98,812		$ 98,812		$ 83,839
Gross Unrealized Gains	1,713		1,713		124
Gross Unrealized (Losses)	(22)		(22)		(808)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 100,503		$ 100,503		$ 83,155
Less than 12 months
Number of securities | security	0		0		6
Fair Value	$ 0		$ 0		$ 14,644
Unrealized Loss	$ 0		$ 0		$ (49)
Percentage	0.00%		0.00%		0.33%
12 months or more
Number of securities | security	5		5		19
Fair Value	$ 12,476		$ 12,476		$ 46,443
Unrealized Loss	$ (22)		$ (22)		$ (759)
Percentage	0.18%		0.18%		1.63%
Total
Number of securities | security	5		5		25
Fair Value	$ 12,476		$ 12,476		$ 61,087
Unrealized Loss	$ (22)		$ (22)		$ (808)
Percentage	0.18%		0.18%		1.32%
Other securities [Member]
Securities available for sale
Securities available for sale, Percent	8.17%		8.17%		10.93%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 25,325		$ 25,325		$ 35,371
Gross Unrealized Gains	0		0		0
Gross Unrealized (Losses)	(150)		(150)		(500)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 25,175		$ 25,175		$ 34,871
Less than 12 months
Number of securities | security	0		0		0
Fair Value	$ 0		$ 0		$ 0
Unrealized Loss	$ 0		$ 0		$ 0
Percentage	0.00%		0.00%		0.00%
12 months or more
Number of securities | security	10		10		14
Fair Value	$ 25,176		$ 25,176		$ 34,871
Unrealized Loss	$ (150)		$ (150)		$ (500)
Percentage	0.60%		0.60%		1.43%
Total
Number of securities | security	10		10		14
Fair Value	$ 25,176		$ 25,176		$ 34,871
Unrealized Loss	$ (150)		$ (150)		$ (500)
Percentage	0.60%		0.60%		1.43%
State and political subdivisions [Member]
Securities available for sale
Securities available for sale, Percent	59.20%		59.20%		63.00%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 180,046		$ 180,046		$ 202,450
Gross Unrealized Gains	2,519		2,519		278
Gross Unrealized (Losses)	(191)		(191)		(1,828)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 182,374		$ 182,374		$ 200,900
Less than 12 months
Number of securities | security	41		41		113
Fair Value	$ 10,735		$ 10,735		$ 31,022
Unrealized Loss	$ (61)		$ (61)		$ (162)
Percentage	0.57%		0.57%		0.52%
12 months or more
Number of securities | security	99		99		325
Fair Value	$ 23,220		$ 23,220		$ 77,921
Unrealized Loss	$ (130)		$ (130)		$ (1,666)
Percentage	0.56%		0.56%		2.14%
Total
Number of securities | security	140		140		438
Fair Value	$ 33,955		$ 33,955		$ 108,943
Unrealized Loss	$ (191)		$ (191)		$ (1,828)
Percentage	0.56%		0.56%		1.68%