Loans (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for loan losses:
Beginning Balance	$ 15,061	$ 10,846	$ 10,942	$ 10,976
Charge-offs	(2,262)	(333)	(2,262)	(1,075)
Recoveries	20	30	39	142
Provisions	3,500	375	7,600	875
Ending Balance	16,319	10,918	16,319	10,918
Commercial real estate
Allowance for loan losses:
Beginning Balance	9,083	6,742	7,398	6,882
Charge-offs	(929)	(4)	(929)	(4)
Recoveries	0	13	0	15
Provisions	3,114	258	4,799	116
Ending Balance	11,268	7,009	11,268	7,009
Residential first mortgages
Allowance for loan losses:
Beginning Balance	862	722	464	755
Charge-offs	0	0	0	0
Recoveries	0	0		0
Provisions	23	(13)	421	(46)
Ending Balance	885	709	885	709
Residential rentals
Allowance for loan losses:
Beginning Balance	702	462	397	498
Charge-offs	0	0	0	(53)
Recoveries	0	0	0	46
Provisions	357	(4)	662	(33)
Ending Balance	1,059	458	1,059	458
Construction and land development
Allowance for loan losses:
Beginning Balance	436	148	273	310
Charge-offs	0	(329)	0	(329)
Recoveries	0	0		0
Provisions	(8)	427	155	265
Ending Balance	428	246	428	246
Home equity and second mortgages
Allowance for loan losses:
Beginning Balance	258	132	149	133
Charge-offs	(25)	0	(25)	0
Recoveries	0	2	1	4
Provisions	26	(3)	134	(6)
Ending Balance	259	131	259	131
Commercial loans
Allowance for loan losses:
Beginning Balance	2,266	1,406	1,086	1,482
Charge-offs	(1,026)	0	(1,026)	0
Recoveries	5	5	10	10
Provisions	(83)	(9)	1,092	(90)
Ending Balance	1,162	1,402	1,162	1,402
Consumer loans
Allowance for loan losses:
Beginning Balance	15	8	10	6
Charge-offs	0	0	0	(4)
Recoveries	0	1	0	2
Provisions	0	0	5	5
Ending Balance	15	9	15	9
Commercial equipment
Allowance for loan losses:
Beginning Balance	1,439	1,226	1,165	910
Charge-offs	(282)	0	(282)	(685)
Recoveries	15	9	28	65
Provisions	71	(281)	332	664
Ending Balance	$ 1,243	$ 954	$ 1,243	$ 954