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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | $ 17,801 | $ 21,457
Financing Receivable, Nonaccrual | 27,877 | 23,750
Construction and Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 160 | 162
Financing Receivable, Nonaccrual | 225 | 162
Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 374 | 359
Financing Receivable, Nonaccrual | 374 | 359
1-4 Family Residential Properties |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 7,116 | 6,747
Financing Receivable, Nonaccrual | 8,771 | 6,930
Multifamily Residential Properties |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 2,173 | 2,181
Financing Receivable, Nonaccrual | 2,173 | 2,181
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 3,780 | 7,345
Financing Receivable, Nonaccrual | 9,516 | 8,760
Loans Secured by Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 13,603 | 16,794
Financing Receivable, Nonaccrual | 21,059 | 18,392
Agricultural Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 262 | 659
Financing Receivable, Nonaccrual | 262 | 659
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 3,641 | 3,677
Financing Receivable, Nonaccrual | 6,137 | 4,372
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 295 | 327
Financing Receivable, Nonaccrual | 394 | 327
All Other Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | $ 25 | $ 0

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