Loans - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Total	$ 5,858,642	$ 5,884,448
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	34,306	37,969
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	16,557	16,989
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	854	5,164
Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	16,895	15,816
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	5,824,336	5,846,479
Commercial and Industrial Loans
Financing Receivable, Past Due [Line Items]
Total	745,597	761,167
Commercial and Industrial Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	12,818	9,214
Commercial and Industrial Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	5,075	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	7,689	7,096
Commercial and Industrial Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	732,779	751,953
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total	3,152,336	3,142,472
Commercial Real Estate Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	5,997	7,337
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,411	2,559
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	125	281
Commercial Real Estate Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,461	4,497
Commercial Real Estate Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	3,146,339	3,135,135
Agricultural Loans
Financing Receivable, Past Due [Line Items]
Total	467,204	489,168
Agricultural Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	268	1,999
Agricultural Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	875
Agricultural Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	44	0
Agricultural Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	224	1,124
Agricultural Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	466,936	487,169
Leases
Financing Receivable, Past Due [Line Items]
Total	87,336	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	87,336	87,073
Home Equity Loans
Financing Receivable, Past Due [Line Items]
Total	500,696	484,300
Home Equity Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	1,978	3,331
Home Equity Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	642	2,415
Home Equity Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	560	140
Home Equity Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	776	776
Home Equity Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	498,718	480,969
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total	110,065	117,648
Consumer Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	490	1,337
Consumer Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	176	1,017
Consumer Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	28	287
Consumer Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	286	33
Consumer Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	109,575	116,311
Credit Cards
Financing Receivable, Past Due [Line Items]
Total	27,519	28,067
Credit Cards | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	230	475
Credit Cards | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	126	222
Credit Cards | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	43	105
Credit Cards | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	61	148
Credit Cards | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	27,289	27,592
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	767,889	774,553
Residential Mortgage Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	12,525	14,276
Residential Mortgage Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	9,127	9,383
Residential Mortgage Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	2,751
Residential Mortgage Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,398	2,142
Residential Mortgage Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 755,364	$ 760,277