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Loans Held for Investment - Schedule of Troubled Debt Restructurings (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
note
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Loans and Leases Receivable, Troubled Debt Restructuring      
Loans renegotiated in troubled debt restructurings $ 64,600,000 $ 6,200,000  
Loans renegotiated in troubled debt restructurings, non-accrual loans 4,200,000 3,900,000  
Loans renegotiated in troubled debt restructurings, accrual loans $ 60,400,000 2,300,000  
Number of notes under troubled debt restructurings | note 12    
Charge-offs directly related to modified loans $ 5,700,000 $ 0 $ 0
Financing Receivable, Troubled Debt Restructuring, Postmodification 71,700,000    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0    
Balance of notes for which there was a payment default 0    
Impaired Financing Receivable, Recorded Investment 743,300,000    
Financing Receivable, Allowance for Credit Loss, Noncurrent $ 100,000    
Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Number of notes under troubled debt restructurings | note 4    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 53,700,000    
Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Number of notes under troubled debt restructurings | note 2    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 9,000,000.0    
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Number of notes under troubled debt restructurings | note 3    
Concessions in troubled debt restructurings, amount $ 2,500,000    
Agriculture      
Loans and Leases Receivable, Troubled Debt Restructuring      
Number of notes under troubled debt restructurings | note 1    
Concessions in troubled debt restructurings, amount $ 5,900,000    
Residential Real Estate      
Loans and Leases Receivable, Troubled Debt Restructuring      
Number of notes under troubled debt restructurings | note 2    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 600,000    
Interest Only Period Concession      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 3,200,000    
Interest Only Period Concession | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 3,200,000    
Interest Only Period Concession | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Interest Only Period Concession | Agriculture      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Extension of terms or maturity      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 15,700,000    
Extension of terms or maturity | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 4,200,000    
Extension of terms or maturity | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 9,000,000.0    
Extension of terms or maturity | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 1,900,000    
Extension of terms or maturity | Agriculture      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Extension of terms or maturity | Residential Real Estate      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 600,000    
Interest rate adjustment      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Interest rate adjustment | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Interest rate adjustment | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Interest rate adjustment | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Interest rate adjustment | Agriculture      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Interest rate adjustment | Residential Real Estate      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Other      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 52,800,000    
Other | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 46,300,000    
Other | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 600,000    
Other | Agriculture      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 5,900,000    
Interest Only Period | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Interest Only Period | Residential Real Estate      
Loans and Leases Receivable, Troubled Debt Restructuring      
Concessions in troubled debt restructurings, amount 0    
Other Loan Restructuring Modification | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification 0    
Other Loan Restructuring Modification | Residential Real Estate      
Loans and Leases Receivable, Troubled Debt Restructuring      
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0