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Loans and Allowance for Credit Losses - Summary of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 3,951,699 |  | $ 3,143,921 |  |  |
Loans held for sale | 1,897 |  | 1,924 |  |  |
Loans and leases receivable gross excluding loans held for sale | 3,949,802 |  | 3,141,997 |  |  |
Net deferred loan fees, premiums and discounts | 3,930 |  | 5,502 |  |  |
Allowance for credit losses | 53,983 | $ 54,597 | 41,910 | $ 41,915 | $ 38,381 | $ 26,911
Net loans | 3,891,889 |  | 3,094,585 |  |  |
Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,761,093 |  | 2,068,550 |  |  |
Construction and Land Development | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 179,792 |  | 122,853 |  |  |
Allowance for credit losses | 2,109 | 1,795 | 1,666 | 2,206 | 2,358 | 1,146
Agricultural | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 278,432 |  | 254,662 |  |  |
Allowance for credit losses | 1,257 | 1,665 | 1,084 | 1,666 | 1,634 | 1,093
Commercial | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,583,583 |  | 1,176,290 |  |  |
Allowance for credit losses | 25,580 | 25,664 | 19,660 | 18,808 | 16,272 | 11,198
Agricultural Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 126,473 |  | 137,333 |  |  |
Allowance for credit losses | 816 | 906 | 1,526 | 1,234 | 1,323 | 1,386
Commercial and Industrial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 839,630 |  | 741,819 |  |  |
Allowance for credit losses | 18,608 | 19,842 | 13,485 | 13,372 | 12,360 | 9,273
Consumer Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 80,779 |  | 78,023 |  |  |
Allowance for credit losses | 2,953 | 2,155 | 2,167 | 2,238 | 1,948 | 1,429
All Other Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 143,724 |  | 118,196 |  |  |
1-4 Family | Residential Properties | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 412,320 |  | 325,480 |  |  |
Allowance for credit losses | 2,660 | $ 2,570 | 2,322 | $ 2,391 | $ 2,486 | $ 1,386
Multifamily | Residential Properties | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 306,966 |  | $ 189,265 |  |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes Loans held-for-sale and loans and leases covered under loss sharing agreements. + References No definition available. + Details
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