v3.26.1
Loans - Collateral-dependent Loans by Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 5,941,410 $ 5,884,448
Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 745,614 761,167
Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 3,219,433 3,142,472
Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 476,605 489,168
Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 88,224 87,073
Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 522,396 484,300
Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 101,186 117,648
Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 27,250 28,067
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 760,702 774,553
Total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 52,236 61,790
Total | Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 21,200 25,698
Total | Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 26,973 31,164
Total | Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 3,190 3,870
Total | Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Total | Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 425 425
Total | Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Total | Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Total | Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 448 633
Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 35,128 43,034
Real Estate | Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 5,410 8,348
Real Estate | Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 26,483 30,670
Real Estate | Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 2,362 2,958
Real Estate | Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Real Estate | Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 425 425
Real Estate | Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Real Estate | Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Real Estate | Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 448 633
Equipment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 7,019 7,653
Equipment | Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 6,328 6,880
Equipment | Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 490 494
Equipment | Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 201 279
Equipment | Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Equipment | Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Equipment | Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Equipment | Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Equipment | Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 400
Accounts Receivable | Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 400
Accounts Receivable | Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Accounts Receivable | Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 10,089 10,703
Other | Commercial and Industrial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 9,462 10,070
Other | Commercial Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other | Agricultural Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 627 633
Other | Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other | Home Equity Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other | Consumer Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other | Credit Cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Other | Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 0 $ 0