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Loans and Allowance for Credit Losses (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for credit losses allocated to:
Beginning balance	$ 11,090	$ 10,305	$ 10,507	$ 10,343
Charge-offs	(101)	(184)	(1,018)	(801)
Recoveries	288	117	438	396
Net (charge-offs) recoveries	187	(67)	(580)	(405)
Provision	1,500	200	2,850	500
Ending balance	12,777	10,438	12,777	10,438
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Allowance for credit losses allocated to:
Beginning balance	1,497	2,443	1,576	2,662
Charge-offs				(3)
Recoveries	5	1	13	8
Net (charge-offs) recoveries	5	1	13	5
Provision	56	(903)	(31)	(1,126)
Ending balance	1,558	1,541	1,558	1,541
Residential Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	2,639	2,155	2,501	2,353
Charge-offs	(10)	(86)	(201)	(509)
Recoveries	199	12	206	23
Net (charge-offs) recoveries	189	(74)	5	(486)
Provision	456	600	778	814
Ending balance	3,284	2,681	3,284	2,681
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	4,097	3,367	4,032	3,077
Charge-offs	(1)		(601)
Recoveries	1	7		114
Net (charge-offs) recoveries		7	(601)	114
Provision	1,002	474	1,668	657
Ending balance	5,099	3,848	5,099	3,848
Commercial Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	2,355	2,057	1,929	1,949
Charge-offs	(89)	(98)	(208)	(260)
Recoveries	81	96	205	248
Net (charge-offs) recoveries	(8)	(2)	(3)	(12)
Provision	(126)	(39)	295	79
Ending balance	2,221	2,016	2,221	2,016
Consumer Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	502	283	469	302
Charge-offs	(1)		(8)	(29)
Recoveries	2	1	14	3
Net (charge-offs) recoveries	1	1	6	(26)
Provision	112	68	140	76
Ending balance	$ 615	$ 352	$ 615	$ 352

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