Revenue Revenue from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commission and fees from sale of insurance policies	$ 3,231	$ 3,493	$ 9,603	$ 9,117
Fees related to third party insurance administration services	76	107	276	375
Performance-based insurance commissions	60	9	2,044	1,437
Interchange electronic banking income	3,280	3,011	9,930	8,255
Promotional and usage electronic banking income	1,046	755	2,725	2,313
Ongoing maintenance fees for deposit accounts	933	848	2,597	2,677
Transactional-based fees for deposit accounts	1,616	1,418	3,981	4,318
Transactional-based fees included in other non-interest income	207	94	601	624
Revenue from Contract with Customer, Excluding Assessed Tax	14,680	13,238	44,174	40,396
Insurance income	3,367	3,608	11,923	10,929
Fiduciary and Trust [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,158	3,435	12,223	10,013
Interest Rate Swap [Member] | Transaction fee [Member]
Revenue from Contract with Customer, Including Assessed Tax	73	68	194	1,267
Transferred over Time [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12,724	11,649	37,354	32,750
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,956	$ 1,589	$ 6,820	$ 7,646