Loans, Balance in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 45,346	$ 48,022	$ 49,445	$ 48,022	$ 35,096	$ 35,096
Provision expense (credit)	(4,257)	(2,500)	(49)	(6,756)	12,658	16,047
Losses charged off	(948)		(3,809)	(2,418)	(6,224)	(10,453)
Recoveries	1,554		1,047	2,847	2,064	4,292
Ending balance	41,695	45,346	46,634	41,695	46,634	48,022
Commercial [Member] | Hotel/Motel [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	6,664	6,356	5,922	6,356	3,371	3,371
Provision expense (credit)	(990)		210	(682)	2,591	2,858
Losses charged off	0		0	0	0	(43)
Recoveries	0		0	0	0	0
Ending balance	5,674	6,664	6,132	5,674	6,132	6,356
Commercial [Member] | Commercial Real Estate Residential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	4,641	4,464	4,012	4,464	3,439	3,439
Provision expense (credit)	(845)		(544)	(646)	794	1,772
Losses charged off	0		(35)	(24)	(86)	(182)
Recoveries	0		6	2	13	156
Ending balance	3,796	4,641	3,439	3,796	3,439	4,464
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	10,813	11,086	11,563	11,086	8,515	8,515
Provision expense (credit)	(1,798)		(34)	(1,933)	2,950	3,303
Losses charged off	0		(128)	(151)	(187)	(941)
Recoveries	293		7	306	11	90
Ending balance	9,308	10,813	11,408	9,308	11,408	11,086
Commercial [Member] | Dealer Floorplans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,318	1,382	1,713	1,382	802	802
Provision expense (credit)	(57)		(102)	(121)	(11)	(214)
Losses charged off	0		(26)	0	(26)	(26)
Recoveries	0		0	0	0	0
Ending balance	1,261	1,318	1,585	1,261	1,585	1,382
Commercial [Member] | Commercial Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	4,571	4,289	6,409	4,289	5,556	5,556
Provision expense (credit)	43		204	312	1,637	2,040
Losses charged off	(118)		(1,993)	(230)	(2,352)	(3,339)
Recoveries	78		83	203	253	423
Ending balance	4,574	4,571	4,703	4,574	4,703	4,289
Residential [Member] | Real Estate Mortgage [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,143	7,832	7,543	7,832	4,604	4,604
Provision expense (credit)	745		(112)	55	987	1,584
Losses charged off	(186)		(119)	(194)	(179)	(321)
Recoveries	6		24	15	31	72
Ending balance	7,708	7,143	7,336	7,708	7,336	7,832
Residential [Member] | Home Equity Lines [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	750	844	890	844	897	897
Provision expense (credit)	(68)		(35)	(161)	32	16
Losses charged off	(14)		0	(19)	0	(4)
Recoveries	5		1	9	2	10
Ending balance	673	750	856	673	856	844
Consumer [Member] | Consumer Direct [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	1,811	1,863	2,163	1,863	1,711	1,711
Provision expense (credit)	(185)		(64)	(199)	673	609
Losses charged off	(154)		(261)	(308)	(630)	(927)
Recoveries	163		94	279	218	510
Ending balance	1,635	1,811	1,932	1,635	1,932	1,863
Consumer [Member] | Consumer Indirect [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,635	9,906	9,230	9,906	6,201	6,201
Provision expense (credit)	(1,102)		428	(3,381)	3,005	4,079
Losses charged off	(476)		(1,247)	(1,492)	(2,764)	(4,670)
Recoveries	1,009		832	2,033	1,536	3,031
Ending balance	$ 7,066	$ 7,635	$ 9,243	$ 7,066	9,243	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