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Loans and Allowance for Credit Losses - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | $ 30,938 | $ 41,700 | $ 38,618
Interest Income Recognized | 66 | 448 | 619
Real Estate Loan |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 24,790 | 30,178 | 28,754
Interest Income Recognized | 65 | 435 | 589
Construction and Land Development | Real Estate Loan |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 694 | 622 | 2,558
Interest Income Recognized | 7 | 32 | 37
Farm Loans | Real Estate Loan |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 827 | 1,218 | 415
Interest Income Recognized | 0 | 0 | 0
Residential Properties | Real Estate Loan | 1-4 Family |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 8,557 | 9,659 | 6,297
Interest Income Recognized | 17 | 80 | 144
Residential Properties | Real Estate Loan | Multifamily |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 2,325 | 6,490 | 9,666
Interest Income Recognized | 0 | 89 | 137
Commercial | Real Estate Loan |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 12,387 | 12,189 | 9,818
Interest Income Recognized | 41 | 234 | 271
Agricultural Loans |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 815 | 808 | 727
Interest Income Recognized | 0 | 3 | 23
Commercial and Industrial Loans |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 4,941 | 10,065 | 9,003
Interest Income Recognized | 1 | 9 | 6
Consumer Loans |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 392 | 649 | 131
Interest Income Recognized | 0 | 1 | 1
All Other Loans |  |  |
Average recorded investment and interest income recognized [Abstract] |  |  |
Average Investment in Impaired Loans | 0 | 0 | 3
Interest Income Recognized | $ 0 | $ 0 | $ 0

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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