Loans and Allowance for Credit Losses - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 3,023,847
2020	2,456,983
2019	778,086
2018	359,554
2017	353,319
Prior	605,794
Revolving loans amortized cost basis	1,664,006
Revolving loans converted to term	272
Loans	9,241,861	$ 9,243,174
Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,000,298
Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		334,989
Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		234,712
Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,666,062
Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,113
PPP, CARES Act
Financing Receivable, Credit Quality Indicator [Line Items]
2021	100,300
2020		6,300
Loans	106,600	667,100
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,033,127
2020	375,587
2019	152,142
2018	68,827
2017	23,936
Prior	32,992
Revolving loans amortized cost basis	1,027,954
Revolving loans converted to term	0
Loans	2,714,565	2,776,699
Commercial and industrial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,019,757
2020	362,372
2019	144,520
2018	65,165
2017	21,575
Prior	30,420
Revolving loans amortized cost basis	990,335
Revolving loans converted to term	0
Loans	2,634,144
Commercial and industrial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	10,559
2020	11,088
2019	190
2018	730
2017	1,930
Prior	1,825
Revolving loans amortized cost basis	15,026
Revolving loans converted to term	0
Loans	41,348
Commercial and industrial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,811
2020	2,127
2019	7,432
2018	2,932
2017	431
Prior	747
Revolving loans amortized cost basis	22,593
Revolving loans converted to term	0
Loans	39,073
Commercial and industrial loans | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,562,077
Commercial and industrial loans | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		117,503
Commercial and industrial loans | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		97,119
Commercial and industrial loans | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial and industrial loans | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial and industrial loans | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial and industrial loans | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
2021	50,775
2020	47,213
2019	22,303
2018	8,060
2017	6,153
Prior	36,353
Revolving loans amortized cost basis	75,585
Revolving loans converted to term	0
Loans	246,442	281,884
Agricultural land, production and other loans to farmers | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	50,251
2020	45,164
2019	22,195
2018	7,689
2017	6,153
Prior	36,074
Revolving loans amortized cost basis	74,871
Revolving loans converted to term	0
Loans	242,397
Agricultural land, production and other loans to farmers | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	1,543
2019	0
2018	0
2017	0
Prior	252
Revolving loans amortized cost basis	264
Revolving loans converted to term	0
Loans	2,059
Agricultural land, production and other loans to farmers | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	524
2020	506
2019	108
2018	371
2017	0
Prior	27
Revolving loans amortized cost basis	450
Revolving loans converted to term	0
Loans	1,986
Agricultural land, production and other loans to farmers | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		243,991
Agricultural land, production and other loans to farmers | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		26,835
Agricultural land, production and other loans to farmers | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		9,885
Agricultural land, production and other loans to farmers | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Agricultural land, production and other loans to farmers | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Agricultural land, production and other loans to farmers | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,173
Agricultural land, production and other loans to farmers | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2021	235,904
2020	201,132
2019	63,589
2018	979
2017	1,762
Prior	2,499
Revolving loans amortized cost basis	17,201
Revolving loans converted to term	0
Loans	523,066	484,723
Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	215,167
2020	200,169
2019	63,589
2018	979
2017	1,762
Prior	2,453
Revolving loans amortized cost basis	17,201
Revolving loans converted to term	0
Loans	501,320
Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	20,737
2020	270
2019	0
2018	0
2017	0
Prior	46
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	21,053
Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	693
2019	0
2018	0
2017	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	693
Construction | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		446,846
Construction | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		10,445
Construction | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,549
Construction | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Construction | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Construction | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		21,763
Construction | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		120
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2021	676,889
2020	852,798
2019	227,510
2018	113,089
2017	109,556
Prior	128,838
Revolving loans amortized cost basis	26,779
Revolving loans converted to term	0
Loans	2,135,459	2,220,949
Commercial real estate, non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	589,296
2020	688,406
2019	227,332
2018	111,971
2017	103,400
Prior	126,837
Revolving loans amortized cost basis	26,779
Revolving loans converted to term	0
Loans	1,874,021
Commercial real estate, non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	68,279
2020	149,480
2019	0
2018	0
2017	0
Prior	1,723
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	219,482
Commercial real estate, non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	19,314
2020	14,912
2019	178
2018	1,118
2017	6,156
Prior	278
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	41,956
Commercial real estate, non-owner occupied | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,979,827
Commercial real estate, non-owner occupied | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		160,304
Commercial real estate, non-owner occupied | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		80,818
Commercial real estate, non-owner occupied | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, non-owner occupied | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, non-owner occupied | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, non-owner occupied | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2021	311,876
2020	404,099
2019	93,076
2018	44,837
2017	47,059
Prior	51,626
Revolving loans amortized cost basis	34,147
Revolving loans converted to term	0
Loans	986,720	958,501
Commercial real estate, owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	299,186
2020	392,383
2019	92,338
2018	43,252
2017	46,044
Prior	48,571
Revolving loans amortized cost basis	33,998
Revolving loans converted to term	0
Loans	955,772
Commercial real estate, owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	5,665
2020	5,953
2019	738
2018	1,532
2017	902
Prior	1,301
Revolving loans amortized cost basis	149
Revolving loans converted to term	0
Loans	16,240
Commercial real estate, owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	7,025
2020	5,763
2019	0
2018	53
2017	113
Prior	1,754
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	14,708
Commercial real estate, owner occupied | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		907,566
Commercial real estate, owner occupied | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		17,641
Commercial real estate, owner occupied | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		33,294
Commercial real estate, owner occupied | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, owner occupied | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, owner occupied | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Commercial real estate, owner occupied | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2021	351,764
2020	356,660
2019	104,819
2018	71,299
2017	55,520
Prior	216,032
Revolving loans amortized cost basis	2,955
Revolving loans converted to term	78
Loans	1,159,127	1,234,741
Residential | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	349,726
2020	353,691
2019	103,028
2018	69,745
2017	55,240
Prior	210,669
Revolving loans amortized cost basis	2,955
Revolving loans converted to term	73
Loans	1,145,127
Residential | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,034
2020	1,394
2019	1,456
2018	306
2017	172
Prior	2,106
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	6,468
Residential | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,004
2020	1,575
2019	335
2018	1,248
2017	108
Prior	3,257
Revolving loans amortized cost basis	0
Revolving loans converted to term	5
Loans	7,532
Residential | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		199,338
Residential | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,261
Residential | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,058
Residential | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Residential | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Residential | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,020,687
Residential | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,397
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2021	64,365
2020	17,641
2019	2,025
2018	2,135
2017	1,341
Prior	3,526
Revolving loans amortized cost basis	432,527
Revolving loans converted to term	194
Loans	523,754	508,259
Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	63,845
2020	17,556
2019	1,977
2018	2,127
2017	1,250
Prior	3,432
Revolving loans amortized cost basis	427,437
Revolving loans converted to term	194
Loans	517,818
Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	85
2019	48
2018	0
2017	0
Prior	24
Revolving loans amortized cost basis	3,451
Revolving loans converted to term	0
Loans	3,608
Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	520
2020	0
2019	0
2018	8
2017	91
Prior	70
Revolving loans amortized cost basis	1,639
Revolving loans converted to term	0
Loans	2,328
Home equity | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		12,714
Home equity | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Home equity | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		989
Home equity | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Home equity | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Home equity | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		492,999
Home equity | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,557
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
2021	67,828
2020	23,537
2019	11,943
2018	11,230
2017	2,028
Prior	4,986
Revolving loans amortized cost basis	24,540
Revolving loans converted to term	0
Loans	146,092	129,479
Individuals' loans for household and other personal expenditures | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	67,749
2020	23,452
2019	11,893
2018	11,197
2017	2,008
Prior	4,928
Revolving loans amortized cost basis	24,406
Revolving loans converted to term	0
Loans	145,633
Individuals' loans for household and other personal expenditures | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	79
2020	85
2019	50
2018	33
2017	20
Prior	58
Revolving loans amortized cost basis	134
Revolving loans converted to term	0
Loans	459
Individuals' loans for household and other personal expenditures | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Loans	0
Individuals' loans for household and other personal expenditures | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Individuals' loans for household and other personal expenditures | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Individuals' loans for household and other personal expenditures | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Individuals' loans for household and other personal expenditures | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Individuals' loans for household and other personal expenditures | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Individuals' loans for household and other personal expenditures | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		129,440
Individuals' loans for household and other personal expenditures | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		39
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	231,319
2020	178,316
2019	100,679
2018	39,098
2017	105,964
Prior	128,942
Revolving loans amortized cost basis	22,318
Revolving loans converted to term	0
Loans	806,636	647,939
Public finance and other commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	231,319
2020	178,316
2019	100,679
2018	39,098
2017	105,964
Prior	128,942
Revolving loans amortized cost basis	22,318
Revolving loans converted to term	0
Loans	$ 806,636
Public finance and other commercial loans | Commercial Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		647,939
Public finance and other commercial loans | Commercial Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Public finance and other commercial loans | Commercial Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Public finance and other commercial loans | Commercial Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Public finance and other commercial loans | Commercial Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Public finance and other commercial loans | Consumer Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Public finance and other commercial loans | Consumer Non-Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		$ 0