Loans - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Total	$ 5,941,410	$ 5,884,448
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	27,247	37,969
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	9,592	16,989
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,432	5,164
Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	14,223	15,816
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	5,914,163	5,846,479
Commercial and Industrial Loans
Financing Receivable, Past Due [Line Items]
Total	745,614	761,167
Commercial and Industrial Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	6,720	9,214
Commercial and Industrial Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	547	518
Commercial and Industrial Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	54	1,600
Commercial and Industrial Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	6,119	7,096
Commercial and Industrial Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	738,894	751,953
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total	3,219,433	3,142,472
Commercial Real Estate Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	6,176	7,337
Commercial Real Estate Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,402	2,559
Commercial Real Estate Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	432	281
Commercial Real Estate Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,342	4,497
Commercial Real Estate Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	3,213,257	3,135,135
Agricultural Loans
Financing Receivable, Past Due [Line Items]
Total	476,605	489,168
Agricultural Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	271	1,999
Agricultural Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	166	875
Agricultural Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	58	0
Agricultural Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	47	1,124
Agricultural Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	476,334	487,169
Leases
Financing Receivable, Past Due [Line Items]
Total	88,224	87,073
Leases \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	88,224	87,073
Home Equity Loans
Financing Receivable, Past Due [Line Items]
Total	522,396	484,300
Home Equity Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	2,078	3,331
Home Equity Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,099	2,415
Home Equity Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	299	140
Home Equity Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	680	776
Home Equity Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	520,318	480,969
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total	101,186	117,648
Consumer Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	806	1,337
Consumer Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	219	1,017
Consumer Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	111	287
Consumer Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	476	33
Consumer Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	100,380	116,311
Credit Cards
Financing Receivable, Past Due [Line Items]
Total	27,250	28,067
Credit Cards \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	283	475
Credit Cards \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	168	222
Credit Cards \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	68	105
Credit Cards \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	47	148
Credit Cards \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	26,967	27,592
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	760,702	774,553
Residential Mortgage Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	10,913	14,276
Residential Mortgage Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	5,991	9,383
Residential Mortgage Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,410	2,751
Residential Mortgage Loans \| Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,512	2,142
Residential Mortgage Loans \| Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 749,789	$ 760,277