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Loans and Allowance for Credit Losses - Amortized Cost Basis of Loans on Nonaccrual Status and Nonaccrual Loans Individually Evaluated (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | $ 21,003 | $ 21,457
Financing Receivable, Nonaccrual | 23,445 | 23,750
Construction and Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 943 | 162
Financing Receivable, Nonaccrual | 943 | 162
Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 338 | 359
Financing Receivable, Nonaccrual | 338 | 359
1-4 Family Residential Properties |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 7,179 | 6,747
Financing Receivable, Nonaccrual | 7,232 | 6,930
Multifamily Residential Properties |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 2,047 | 2,181
Financing Receivable, Nonaccrual | 2,047 | 2,181
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 8,141 | 7,345
Financing Receivable, Nonaccrual | 8,525 | 8,760
Loans Secured by Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 18,648 | 16,794
Financing Receivable, Nonaccrual | 19,085 | 18,392
Agricultural Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 236 | 659
Financing Receivable, Nonaccrual | 236 | 659
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 1,886 | 3,677
Financing Receivable, Nonaccrual | 3,891 | 4,372
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 233 | 327
Financing Receivable, Nonaccrual | 233 | 327
All Other Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | $ 0 | $ 0

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