Loans, Allowance for Credit Losses (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 [Roll Forward]
Beginning balance	$ 46,634		$ 35,096
Provision charged to expense	2,433	$ 1,253	15,091	[1]	$ 3,006
Losses charged off	(2,268)		(8,492)
Recoveries	1,187		3,251
Ending balance	47,986		47,986
Commercial [Member] | Hotel/Motel [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	6,132		3,371
Provision charged to expense	(81)		2,510
Losses charged off	(42)		(42)
Recoveries	0		0
Ending balance	6,009		6,009
Commercial [Member] | Commercial Real Estate Residential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	3,439		3,439
Provision charged to expense	1,224		2,035
Losses charged off	(50)		(148)
Recoveries	5		13
Ending balance	4,618		4,618
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	11,408		8,515
Provision charged to expense	475		3,408
Losses charged off	(761)		(937)
Recoveries	32		49
Ending balance	11,154		11,154
Commercial [Member] | Dealer Floorplans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,585		802
Provision charged to expense	(172)		(183)
Losses charged off	0		(26)
Recoveries	0		0
Ending balance	1,413		1,413
Commercial [Member] | Commercial Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	4,703		5,556
Provision charged to expense	112		1,749
Losses charged off	(318)		(2,669)
Recoveries	101		353
Ending balance	4,598		4,598
Residential [Member] | Real Estate Mortgage [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,336		4,604
Provision charged to expense	524		1,511
Losses charged off	(97)		(276)
Recoveries	23		54
Ending balance	7,786		7,786
Residential [Member] | Home Equity Lines [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	856		897
Provision charged to expense	56		88
Losses charged off	(4)		(4)
Recoveries	1		3
Ending balance	909		909
Consumer [Member] | Consumer Direct [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,932		1,711
Provision charged to expense	42		715
Losses charged off	(150)		(780)
Recoveries	95		313
Ending balance	1,919		1,919
Consumer [Member] | Consumer Indirect [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	9,243		6,201
Provision charged to expense	253		3,258
Losses charged off	(846)		(3,610)
Recoveries	930		2,466
Ending balance	$ 9,580		9,580
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance			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
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)
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
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
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)
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
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)
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)
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] Effective January 1, 2020, the provision for loan losses became the provision for credit losses with the implementation of ASU 2016-13, commonly referred to as CECL.