Allowance for Credit Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 5,260,327	$ 4,917,550
Commercial and industrial \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	93,073
2019	73,311
2018	57,468
2017	62,111
2016	35,739
Prior	302,038
Revolving Loans Amortized Cost Basis	152,946
Revolving Loans Converted to Term	16,301
Total Loans	792,987
Commercial and industrial \| Other \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	91,597
2019	72,639
2018	56,191
2017	60,714
2016	33,402
Prior	301,027
Revolving Loans Amortized Cost Basis	149,969
Revolving Loans Converted to Term	16,301
Total Loans	781,840
Commercial and industrial \| Other \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,064
2019	367
2018	344
2017	912
2016	2,045
Prior	228
Revolving Loans Amortized Cost Basis	1,331
Revolving Loans Converted to Term	0
Total Loans	6,291
Commercial and industrial \| Other \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	412
2019	305
2018	933
2017	485
2016	292
Prior	783
Revolving Loans Amortized Cost Basis	1,646
Revolving Loans Converted to Term	0
Total Loans	4,856
Commercial and industrial \| PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	291,252
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	291,252
Commercial and industrial \| PPP loans \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	291,252
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	291,252
Commercial and industrial \| PPP loans \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	0
Commercial and industrial \| PPP loans \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	0
Commercial and industrial \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	11,635
2019	8,088
2018	11,190
2017	7,462
2016	3,539
Prior	4,907
Revolving Loans Amortized Cost Basis	46,328
Revolving Loans Converted to Term	1,340
Total Loans	94,489
Commercial and industrial \| Agriculture \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	11,536
2019	8,005
2018	11,162
2017	6,531
2016	3,539
Prior	2,599
Revolving Loans Amortized Cost Basis	41,936
Revolving Loans Converted to Term	1,340
Total Loans	86,648
Commercial and industrial \| Agriculture \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	28
2017	729
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	2,080
Revolving Loans Converted to Term	0
Total Loans	2,837
Commercial and industrial \| Agriculture \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	99
2019	83
2018	0
2017	202
2016	0
Prior	2,308
Revolving Loans Amortized Cost Basis	2,312
Revolving Loans Converted to Term	0
Total Loans	5,004
Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	278,782
2019	264,280
2018	256,658
2017	248,313
2016	330,041
Prior	727,711
Revolving Loans Amortized Cost Basis	33,622
Revolving Loans Converted to Term	64,903
Total Loans	2,204,310
Commercial real estate \| Other \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	278,747
2019	246,331
2018	232,651
2017	237,487
2016	290,106
Prior	664,027
Revolving Loans Amortized Cost Basis	33,117
Revolving Loans Converted to Term	64,903
Total Loans	2,047,369
Commercial real estate \| Other \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	35
2019	13,016
2018	5,612
2017	4,654
2016	34,310
Prior	46,074
Revolving Loans Amortized Cost Basis	203
Revolving Loans Converted to Term	0
Total Loans	103,904
Commercial real estate \| Other \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	4,933
2018	18,395
2017	6,172
2016	5,625
Prior	17,610
Revolving Loans Amortized Cost Basis	302
Revolving Loans Converted to Term	0
Total Loans	53,037
Commercial real estate \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	24,400
2019	35,081
2018	45,094
2017	25,499
2016	18,847
Prior	46,092
Revolving Loans Amortized Cost Basis	1,251
Revolving Loans Converted to Term	5,602
Total Loans	201,866
Commercial real estate \| Agriculture \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	22,440
2019	35,081
2018	44,519
2017	22,356
2016	17,081
Prior	44,559
Revolving Loans Amortized Cost Basis	919
Revolving Loans Converted to Term	5,602
Total Loans	192,557
Commercial real estate \| Agriculture \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,960
2019	0
2018	575
2017	1,366
2016	1,053
Prior	6
Revolving Loans Amortized Cost Basis	49
Revolving Loans Converted to Term	0
Total Loans	5,009
Commercial real estate \| Agriculture \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	1,777
2016	713
Prior	1,527
Revolving Loans Amortized Cost Basis	283
Revolving Loans Converted to Term	0
Total Loans	4,300
Commercial real estate \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	14,465
2019	20,705
2018	7,999
2017	2,478
2016	1,879
Prior	7,473
Revolving Loans Amortized Cost Basis	86,966
Revolving Loans Converted to Term	21,051
Total Loans	163,016
Commercial real estate \| Construction \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	14,465
2019	20,705
2018	7,999
2017	2,478
2016	1,879
Prior	6,682
Revolving Loans Amortized Cost Basis	85,513
Revolving Loans Converted to Term	21,051
Total Loans	160,772
Commercial real estate \| Construction \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	467
Revolving Loans Amortized Cost Basis	1,453
Revolving Loans Converted to Term	0
Total Loans	1,920
Commercial real estate \| Construction \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	324
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	324
Residential Real Estate \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,440
2019	2,782
2018	1,052
2017	2,120
2016	916
Prior	1,612
Revolving Loans Amortized Cost Basis	190,861
Revolving Loans Converted to Term	44
Total Loans	200,827
Residential Real Estate \| Home equity \| Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,440
2019	2,764
2018	1,052
2017	2,120
2016	722
Prior	1,106
Revolving Loans Amortized Cost Basis	188,614
Revolving Loans Converted to Term	44
Total Loans	197,862
Residential Real Estate \| Home equity \| Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	18
2018	0
2017	0
2016	194
Prior	506
Revolving Loans Amortized Cost Basis	2,247
Revolving Loans Converted to Term	0
Total Loans	2,965
Residential Real Estate \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	305,476
2019	193,801
2018	123,660
2017	156,405
2016	179,553
Prior	262,861
Revolving Loans Amortized Cost Basis	11,787
Revolving Loans Converted to Term	1,617
Total Loans	1,235,160
Residential Real Estate \| Residential Real Estate \| Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	305,476
2019	193,543
2018	123,205
2017	155,699
2016	178,149
Prior	255,556
Revolving Loans Amortized Cost Basis	11,735
Revolving Loans Converted to Term	1,617
Total Loans	1,224,980
Residential Real Estate \| Residential Real Estate \| Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	258
2018	455
2017	706
2016	1,404
Prior	7,305
Revolving Loans Amortized Cost Basis	52
Revolving Loans Converted to Term	0
Total Loans	10,180
Consumer and other \| Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	14,845
2019	11,201
2018	8,178
2017	6,644
2016	2,854
Prior	10,842
Revolving Loans Amortized Cost Basis	6,835
Revolving Loans Converted to Term	0
Total Loans	61,399
Consumer and other \| Direct \| Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	14,840
2019	11,127
2018	8,011
2017	6,632
2016	2,854
Prior	10,840
Revolving Loans Amortized Cost Basis	6,835
Revolving Loans Converted to Term	0
Total Loans	61,139
Consumer and other \| Direct \| Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	5
2019	74
2018	167
2017	12
2016	0
Prior	2
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	260
Consumer and other \| Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,424
2019	1,945
2018	3,371
2017	1,135
2016	418
Prior	108
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	8,401
Consumer and other \| Indirect \| Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,424
2019	1,878
2018	3,327
2017	1,128
2016	382
Prior	93
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	8,232
Consumer and other \| Indirect \| Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	67
2018	44
2017	7
2016	36
Prior	15
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total Loans	$ 169
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		4,701,046
Originated \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		3,265,633
Originated \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		3,177,741
Originated \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		29,800
Originated \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		58,092
Originated \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		968,985
Originated \| Commercial and industrial \| Other \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		863,199
Originated \| Commercial and industrial \| Other \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		851,517
Originated \| Commercial and industrial \| Other \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		8,306
Originated \| Commercial and industrial \| Other \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		3,376
Originated \| Commercial and industrial \| Agriculture \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		105,786
Originated \| Commercial and industrial \| Agriculture \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		89,892
Originated \| Commercial and industrial \| Agriculture \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		1,698
Originated \| Commercial and industrial \| Agriculture \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		14,196
Originated \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		2,296,648
Originated \| Commercial real estate \| Other \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		1,899,645
Originated \| Commercial real estate \| Other \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		1,857,142
Originated \| Commercial real estate \| Other \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		16,623
Originated \| Commercial real estate \| Other \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		25,880
Originated \| Commercial real estate \| Agriculture \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		184,701
Originated \| Commercial real estate \| Agriculture \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		166,888
Originated \| Commercial real estate \| Agriculture \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		3,173
Originated \| Commercial real estate \| Agriculture \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		14,640
Originated \| Commercial real estate \| Construction \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		212,302
Originated \| Commercial real estate \| Construction \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		212,302
Originated \| Commercial real estate \| Construction \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		0
Originated \| Commercial real estate \| Construction \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		0
Originated \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		1,344,466
Originated \| Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		73,625
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		220,149
Acquired \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		185,993
Acquired \| Pass \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		183,586
Acquired \| Special Mention \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		0
Acquired \| Substandard \| Commercial Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		2,407

Allowance for Credit Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Accounts, Notes, Loans and Financing Receivable [Line Items]

Total Loans

$ 5,260,327

$ 4,917,550

Commercial and industrial | Other

Accounts, Notes, Loans and Financing Receivable [Line Items]

2020

93,073

2019