Loans, Balance in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 41,695		$ 46,634	$ 48,022	$ 35,096	$ 35,096
Provision charged to expense	(163)	$ (4,300)	2,433	(6,919)	15,091	16,047
Losses charged off	(1,056)		(2,268)	(3,474)	(8,492)	(10,453)
Recoveries	739		1,187	3,586	3,251	4,292
Ending balance	41,215	41,695	47,986	41,215	47,986	48,022
Commercial [Member] | Hotel/Motel [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	5,674		6,132	6,356	3,371	3,371
Provision charged to expense	(467)		(81)	(1,149)	2,510	2,858
Losses charged off	0		(42)	0	(42)	(43)
Recoveries	0		0	0	0	0
Ending balance	5,207	5,674	6,009	5,207	6,009	6,356
Commercial [Member] | Commercial Real Estate Residential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	3,796		3,439	4,464	3,439	3,439
Provision charged to expense	79		1,224	(567)	2,035	1,772
Losses charged off	(4)		(50)	(28)	(148)	(182)
Recoveries	5		5	7	13	156
Ending balance	3,876	3,796	4,618	3,876	4,618	4,464
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	9,308		11,408	11,086	8,515	8,515
Provision charged to expense	(569)		475	(2,502)	3,408	3,303
Losses charged off	(117)		(761)	(268)	(937)	(941)
Recoveries	8		32	314	49	90
Ending balance	8,630	9,308	11,154	8,630	11,154	11,086
Commercial [Member] | Dealer Floorplans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,261		1,585	1,382	802	802
Provision charged to expense	(85)		(172)	(206)	(183)	(214)
Losses charged off	0		0	0	(26)	(26)
Recoveries	0		0	0	0	0
Ending balance	1,176	1,261	1,413	1,176	1,413	1,382
Commercial [Member] | Commercial Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	4,574		4,703	4,289	5,556	5,556
Provision charged to expense	320		112	632	1,749	2,040
Losses charged off	(203)		(318)	(433)	(2,669)	(3,339)
Recoveries	52		101	255	353	423
Ending balance	4,743	4,574	4,598	4,743	4,598	4,289
Residential [Member] | Real Estate Mortgage [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,708		7,336	7,832	4,604	4,604
Provision charged to expense	(269)		524	(214)	1,511	1,584
Losses charged off	(9)		(97)	(203)	(276)	(321)
Recoveries	8		23	23	54	72
Ending balance	7,438	7,708	7,786	7,438	7,786	7,832
Residential [Member] | Home Equity Lines [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	673		856	844	897	897
Provision charged to expense	181		56	20	88	16
Losses charged off	(14)		(4)	(33)	(4)	(4)
Recoveries	5		1	14	3	10
Ending balance	845	673	909	845	909	844
Consumer [Member] | Consumer Direct [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,635		1,932	1,863	1,711	1,711
Provision charged to expense	290		42	91	715	609
Losses charged off	(194)		(150)	(502)	(780)	(927)
Recoveries	110		95	389	313	510
Ending balance	1,841	1,635	1,919	1,841	1,919	1,863
Consumer [Member] | Consumer Indirect [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,066		9,243	9,906	6,201	6,201
Provision charged to expense	357		253	(3,024)	3,258	4,079
Losses charged off	(515)		(846)	(2,007)	(3,610)	(4,670)
Recoveries	551		930	2,584	2,466	3,031
Ending balance	$ 7,459	$ 7,066	$ 9,580	$ 7,459	9,580	9,906
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					3,040	3,040
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial [Member] | Hotel/Motel [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					170	170
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial [Member] | Commercial Real Estate Residential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					(721)	(721)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					119	119
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial [Member] | Dealer Floorplans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					820	820
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial [Member] | Commercial Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					(391)	(391)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Residential [Member] | Real Estate Mortgage [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					1,893	1,893
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Residential [Member] | Home Equity Lines [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					(75)	(75)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member] | Consumer Direct [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					(40)	(40)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member] | Consumer Indirect [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance					$ 1,265	$ 1,265