Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans	$ 11,397,417	$ 9,241,861
Loans > 90 Days or More Past Due And Accruing	592	963
Current
Financing Receivable, Past Due [Line Items]
Loans	11,350,565	9,207,113
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	14,487	15,006
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	22,857	7,056
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	9,508	12,686
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Loans	3,297,477	2,714,565
Loans > 90 Days or More Past Due And Accruing	38	675
Commercial and industrial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	3,290,767	2,708,539
Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,344	2,602
Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	124	2,437
Commercial and industrial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,242	987
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Loans	214,904	246,442
Loans > 90 Days or More Past Due And Accruing	0	0
Agricultural land, production and other loans to farmers | Current
Financing Receivable, Past Due [Line Items]
Loans	214,847	246,380
Agricultural land, production and other loans to farmers | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	36
Agricultural land, production and other loans to farmers | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Agricultural land, production and other loans to farmers | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	57	26
Construction
Financing Receivable, Past Due [Line Items]
Loans	745,983	523,066
Loans > 90 Days or More Past Due And Accruing	0	0
Construction | Current
Financing Receivable, Past Due [Line Items]
Loans	731,495	522,349
Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	621	717
Construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,759	0
Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	108	0
Commercial real estate, non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	2,423,185	2,135,459
Loans > 90 Days or More Past Due And Accruing	0	0
Commercial real estate, non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	2,412,738	2,124,853
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,126	3,327
Commercial real estate, non-owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,312	0
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,009	7,279
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,264,563	986,720
Loans > 90 Days or More Past Due And Accruing	0	0
Commercial real estate, owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	1,263,864	985,785
Commercial real estate, owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	256	643
Commercial real estate, owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	145	0
Commercial real estate, owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	298	292
Residential
Financing Receivable, Past Due [Line Items]
Loans	1,813,297	1,159,127
Loans > 90 Days or More Past Due And Accruing	554	0
Residential | Current
Financing Receivable, Past Due [Line Items]
Loans	1,803,199	1,148,294
Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,241	3,979
Residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,683	4,255
Residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,174	2,599
Home equity
Financing Receivable, Past Due [Line Items]
Loans	586,108	523,754
Loans > 90 Days or More Past Due And Accruing	0	288
Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans	582,181	518,643
Home equity | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,593	3,327
Home equity | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	719	281
Home equity | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,615	1,503
Individuals' loans for household and other personal expenditures
Financing Receivable, Past Due [Line Items]
Loans	157,264	146,092
Loans > 90 Days or More Past Due And Accruing	0	0
Individuals' loans for household and other personal expenditures | Current
Financing Receivable, Past Due [Line Items]
Loans	156,838	145,634
Individuals' loans for household and other personal expenditures | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	306	375
Individuals' loans for household and other personal expenditures | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	115	83
Individuals' loans for household and other personal expenditures | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	5	0
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Loans	894,636	806,636
Loans > 90 Days or More Past Due And Accruing	0	0
Public finance and other commercial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	894,636	806,636
Public finance and other commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Public finance and other commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Public finance and other commercial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 0	$ 0