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Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents and Other (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Cash and Cash Equivalents    
Cash accounts in excess of federally insured limits $ 564,500,000 $ 208,400,000
Cash accounts in excess of federally insured limits with Federal Reserve Bank 510,200,000 185,600,000
Cash accounts in excess of federally insured limits with Federal Home Loan Bank of Indianapolis 5,800,000 3,600,000
Cash accounts in excess of federally insured limits with Federal Home Loan Bank of Chicago 156,000 150,000
Securities    
Securities held to maturity ($1,203,535 and $1,118,966 at fair value, respectively) $ 1,204,217,000 $ 1,119,078,000
Loans Held for Sale under Mortgage Banking Activities    
Maximum participation interest to be purchased in individual loans (as a percent) 100.00%