Securities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) security	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) security
Securities available for sale
Securities available for sale, Percent	100.00%		100.00%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 367,051		$ 351,069
Gross Unrealized Gains	7,257		4,564
Gross Unrealized (Losses)	(2,469)		(330)
Amortized Cost
Due in one year or less	65,163
Due after one year through five years	206,921
Due after five years through ten years	82,468
Due over ten years	12,499
Fair Value
Due in one year or less	65,416
Due after one year through five years	212,657
Due after five years through ten years	81,957
Due over ten years	11,809
Carrying value of investment securities pledged to collateralize short-term borrowings	371,839		$ 355,303
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Sales proceeds	313	$ 0
Gross realized gains	10	0
Gross realized losses	$ 0	$ 0
Less than 12 months
Number of securities \| security	381		77
Fair Value	$ 101,743		$ 45,813
Unrealized Loss	$ (2,460)		$ (255)
Percentage	2.42%		0.56%
12 months or more
Number of securities \| security	9		27
Fair Value	$ 1,086		$ 21,549
Unrealized Loss	$ (9)		$ (75)
Percentage	0.83%		0.35%
Total
Number of securities \| security	390		104
Fair Value	$ 102,829		$ 67,362
Unrealized Loss	$ (2,469)		$ (330)
Percentage	2.40%		0.49%
Collateralized Securities [Member]
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 13,510
U.S. Treasury [Member]
Securities available for sale
Securities available for sale, Percent	40.00%		36.19%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 142,669		$ 127,096
Gross Unrealized Gains	6,071		1,626
Gross Unrealized (Losses)	0		(137)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 148,740		$ 128,585
Less than 12 months
Number of securities \| security	0		11
Fair Value	$ 0		$ 27,932
Unrealized Loss	$ 0		$ (136)
Percentage	0.00%		0.49%
12 months or more
Number of securities \| security	0		1
Fair Value	$ 0		$ 2,495
Unrealized Loss	$ 0		$ (1)
Percentage	0.00%		0.04%
Total
Number of securities \| security	0		12
Fair Value	$ 0		$ 30,427
Unrealized Loss	$ 0		$ (137)
Percentage	0.00%		0.45%
Other securities [Member]
Securities available for sale
Securities available for sale, Percent	3.45%		4.29%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 12,775		$ 15,287
Gross Unrealized Gains	51		0
Gross Unrealized (Losses)	0		(58)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 12,826		$ 15,229
Less than 12 months
Number of securities \| security	0		0
Fair Value	$ 0		$ 0
Unrealized Loss	$ 0		$ 0
Percentage	0.00%		0.00%
12 months or more
Number of securities \| security	0		6
Fair Value	$ 0		$ 15,229
Unrealized Loss	$ 0		$ (58)
Percentage	0.00%		0.38%
Total
Number of securities \| security	0		6
Fair Value	$ 0		$ 15,229
Unrealized Loss	$ 0		$ (58)
Percentage	0.00%		0.38%
State and political subdivisions [Member]
Securities available for sale
Securities available for sale, Percent	56.55%		59.52%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 211,607		$ 208,686
Gross Unrealized Gains	1,135		2,938
Gross Unrealized (Losses)	(2,469)		(135)
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 210,273		$ 211,489
Less than 12 months
Number of securities \| security	381		66
Fair Value	$ 101,743		$ 17,881
Unrealized Loss	$ (2,460)		$ (119)
Percentage	2.42%		0.67%
12 months or more
Number of securities \| security	9		20
Fair Value	$ 1,086		$ 3,825
Unrealized Loss	$ (9)		$ (16)
Percentage	0.83%		0.42%
Total
Number of securities \| security	390		86
Fair Value	$ 102,829		$ 21,706
Unrealized Loss	$ (2,469)		$ (135)
Percentage	2.40%		0.62%

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