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Loans and Allowance for Loan Losses - Acquired Loans with Credit Deterioration (Details) - USD ($) | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount | $ 3,189,930,000 |  | $ 2,666,616,000 |  |  |
Allowance for loan losses | (41,915,000) | $ (38,381,000) | (26,911,000) | $ (26,741,000) | $ (26,359,000) | $ (26,189,000)
Carrying amount, net of allowance | 3,189,930,000 |  | 2,666,616,000 |  |  |
Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 4,951,000 |  |  |
Allowance for loan losses |  |  | (365,000) |  |  |
Carrying amount, net of allowance |  |  | 4,586,000 |  |  |
Financial Asset Acquired with Credit Deterioration | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 4,951,000 |  |  |
Construction and Land Development | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (2,206,000) | (2,358,000) | (1,146,000) | (1,498,000) | (739,000) | (561,000)
Construction and Land Development | Financial Asset Acquired with Credit Deterioration | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 256,000 |  |  |
Agricultural | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (1,666,000) | (1,634,000) | (1,093,000) | (1,150,000) | (1,284,000) | (1,246,000)
Agricultural | Financial Asset Acquired with Credit Deterioration | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 0 |  |  |
Residential Properties | Real Estate Loan | 1-4 Family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (2,391,000) | (2,486,000) | (1,386,000) | (1,812,000) | (1,649,000) | (1,504,000)
Residential Properties | Financial Asset Acquired with Credit Deterioration | Real Estate Loan | 1-4 Family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 371,000 |  |  |
Residential Properties | Financial Asset Acquired with Credit Deterioration | Real Estate Loan | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | 2,077,000 |  |  |
Commercial | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ (18,808,000) | $ (16,272,000) | (11,198,000) | $ (10,164,000) | $ (10,796,000) | $ (11,102,000)
Commercial | Financial Asset Acquired with Credit Deterioration | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount |  |  | $ 2,247,000 |  |  |

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