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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Part III (PCI Loans) (Details) - USD ($) | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | $ (32,876,000) | $ (28,583,000) | $ (26,911,000) | $ (26,704,000) | $ (26,189,000)
Carrying amount, net of allowance | 2,710,171,000 |  | 2,666,616,000 |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 4,951,000 |  |
Allowance for loan losses |  | (1,198,000) | (365,000) |  |
Carrying amount, net of allowance |  |  | 4,586,000 |  |
Financing Receivable, Allowance for Credit Losses Reversed |  |  | 1,229,000 |  |
Agricultural loans |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | (1,064,000) | (1,023,000) | (1,386,000) | (1,130,000) | (951,000)
Agricultural loans | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 0 |  |
Construction and land development |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | (1,620,000) | (1,033,000) | (1,146,000) | (552,000) | (561,000)
Construction and land development | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 256,000 |  |
Allowance for loan losses |  | (291,000) | 0 |  |
Agricultural real estate |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | (1,335,000) | (1,323,000) | (1,093,000) | (1,282,000) | (1,246,000)
Agricultural real estate | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 0 |  |
1-4 Family residential properties |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | (1,931,000) | (2,142,000) | (1,386,000) | (1,341,000) | (1,504,000)
1-4 Family residential properties | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 371,000 |  |
Allowance for loan losses |  | (48,000) | (6,000) |  |
Multifamily residential properties | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 2,077,000 |  |
Commercial real estate | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 2,247,000 |  |
Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 4,951,000 |  |
Commercial and industrial loans |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses |  | (9,428,000) | (9,273,000) |  |
Commercial and industrial loans | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | 0 |  |
Allowance for loan losses |  | (41,000) | 0 |  |
Consumer loans |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses | $ (2,011,000) | $ (1,895,000) | (1,429,000) | $ (1,004,000) | $ (932,000)
Consumer loans | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount |  |  | $ 0 |  |

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