Loans, Balance in Allowance for Loan and Lease Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2020		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Allowance for loan losses [Roll Forward]
Beginning balance		$ 35,096	[1]	$ 35,096	[1]	$ 35,908
Provision charged to expense						4,819
Losses charged off						(9,736)
Recoveries						4,105
Ending balance				$ 48,022	[1]	35,096	[1]	$ 35,908
Ending balance [Abstract]
Individually evaluated for impairment						1,212
Collectively evaluated for impairment						33,884
Loans ending balance [Abstract]
Individually evaluated for impairment						57,771
Collectively evaluated for impairment						3,190,893
Period of reasonable and supportable forecast				12 months
Provision for credit losses	[2]			$ 16,047		4,819		6,167
Increase (decrease) in allowance for credit losses				11,200
Allowance for credit losses				$ 48,022		$ 35,096
Allowance for credit losses to nonperforming loans				180.70%
Allowance for loan and lease losses to nonperforming loans						104.40%
Credit loss reserve as percentage of total loans outstanding				1.35%
Allowance for loan loss as percentage of total loans outstanding						1.08%
Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		5,501		$ 5,501
Ending balance						$ 5,501
Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		1,711		1,711
Ending balance						1,711
Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		6,201		6,201
Ending balance						6,201
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		1,299		1,299		862
Provision charged to expense						497
Losses charged off						(72)
Recoveries						12
Ending balance						1,299		862
Ending balance [Abstract]
Individually evaluated for impairment						99
Collectively evaluated for impairment						1,200
Loans ending balance [Abstract]
Individually evaluated for impairment						3,010
Collectively evaluated for impairment						101,799
Commercial [Member] | Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		14,025		14,025		14,531
Provision charged to expense						(137)
Losses charged off						(727)
Recoveries						358
Ending balance						14,025		14,531
Ending balance [Abstract]
Individually evaluated for impairment						227
Collectively evaluated for impairment						13,798
Loans ending balance [Abstract]
Individually evaluated for impairment						41,379
Collectively evaluated for impairment						1,128,596
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		4		4		12
Provision charged to expense						(8)
Losses charged off						0
Recoveries						0
Ending balance						4		12
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						4
Loans ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						481
Commercial [Member] | Commercial Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		6,355		6,355		4,993
Provision charged to expense						3,032
Losses charged off						(2,179)
Recoveries						509
Ending balance						6,355		4,993
Ending balance [Abstract]
Individually evaluated for impairment						886
Collectively evaluated for impairment						5,469
Loans ending balance [Abstract]
Individually evaluated for impairment						11,073
Collectively evaluated for impairment						378,610
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		372		372		512
Provision charged to expense						(40)
Losses charged off						(100)
Recoveries						0
Ending balance						372		512
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						372
Loans ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						63,350
Residential [Member] | Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		4,232		4,232		4,433
Provision charged to expense						414
Losses charged off						(767)
Recoveries						152
Ending balance						4,232		4,433
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						4,232
Loans ending balance [Abstract]
Individually evaluated for impairment						2,309
Collectively evaluated for impairment						730,694
Provision for credit losses				1,584
Allowance for credit losses				7,832		4,604
Residential [Member] | Home Equity Lines [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		897		897		841
Provision charged to expense						172
Losses charged off						(139)
Recoveries						23
Ending balance						897		841
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						897
Loans ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						111,894
Provision for credit losses				16
Allowance for credit losses				844		897
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		1,711		1,711		1,883
Provision charged to expense						528
Losses charged off						(1,100)
Recoveries						400
Ending balance						1,711		1,883
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						1,711
Loans ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						148,051
Provision for credit losses				609
Allowance for credit losses				1,863		1,711
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		6,201		6,201		7,841
Provision charged to expense						361
Losses charged off						(4,652)
Recoveries						2,651
Ending balance						6,201		$ 7,841
Ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						6,201
Loans ending balance [Abstract]
Individually evaluated for impairment						0
Collectively evaluated for impairment						527,418
Provision for credit losses				4,079
Allowance for credit losses				9,906		6,201
ASU 2016-13 [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		38,137		38,137
Ending balance						38,137
ASU 2016-13 [Member] | Inherent Model Risk [Member]
Loans ending balance [Abstract]
Increase (decrease) in allowance for credit loss balance		(1,600)
ASU 2016-13 [Member] | Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		7,319		7,319
Ending balance						7,319
ASU 2016-13 [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		1,671		1,671
Ending balance						1,671
ASU 2016-13 [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance		$ 7,467		$ 7,467
Ending balance						7,467
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Loans ending balance [Abstract]
Allowance for credit losses						3,040
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Residential [Member] | Real Estate Mortgage [Member]
Loans ending balance [Abstract]
Allowance for credit losses						1,893
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Residential [Member] | Home Equity Lines [Member]
Loans ending balance [Abstract]
Allowance for credit losses						(75)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member] | Consumer Direct [Member]
Loans ending balance [Abstract]
Allowance for credit losses						(40)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member] | Consumer Indirect [Member]
Loans ending balance [Abstract]
Allowance for credit losses						$ 1,265

[1] Effective January 1, 2020, the allowance for loan and lease losses became the allowance for credit losses with the implementation of ASU 2016-13, commonly referred to as CECL.

[2] 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.