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Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 122,074 | $ 83,274 | $ 85,600 | $ 83,968 | $ 83,369
Financing Receivable, Allowance for Credit Loss, Writeoff | (6,789) | (2,988) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 1,763 | 1,531 |  |  |
Provision for credit losses | 41,500 | 1,362 |  |  |
Allowance on Individually Measured Loans | 2,848 | 2,911 |  |  |
Allowance on Collectively Measured Loans | 119,226 | 80,363 |  |  |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 37,122 | 16,359 | 27,873 | 20,340 | 14,766
Financing Receivable, Allowance for Credit Loss, Writeoff | (101) | (678) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 14 | 514 |  |  |
Provision for credit losses | 9,336 | 1,757 |  |  |
Allowance on Individually Measured Loans | 0 | 53 |  |  |
Allowance on Collectively Measured Loans | 37,122 | 16,306 |  |  |
Commercial Business [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 45,570 | 34,545 | 31,054 | 30,292 | 34,658
Financing Receivable, Allowance for Credit Loss, Writeoff | (1,684) | (1,506) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 860 | 527 |  |  |
Provision for credit losses | 15,340 | 866 |  |  |
Allowance on Individually Measured Loans | 1,722 | 2,826 |  |  |
Allowance on Collectively Measured Loans | 43,848 | 31,719 |  |  |
Agriculture [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 11,085 | 10,690 | 6,510 | 15,835 | 9,589
Financing Receivable, Allowance for Credit Loss, Writeoff | (4,726) | (78) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 41 | 58 |  |  |
Provision for credit losses | 9,260 | 1,121 |  |  |
Allowance on Individually Measured Loans | 1,126 | 0 |  |  |
Allowance on Collectively Measured Loans | 9,959 | 10,690 |  |  |
Construction [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 8,845 | 11,965 | 6,821 | 8,571 | 14,395
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | (195) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 442 | 83 |  |  |
Provision for credit losses | 1,582 | (2,318) |  |  |
Allowance on Individually Measured Loans | 0 | 0 |  |  |
Allowance on Collectively Measured Loans | 8,845 | 11,965 |  |  |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 17,659 | 8,311 | 11,672 | 7,435 | 8,024
Financing Receivable, Allowance for Credit Loss, Writeoff | (10) | (481) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 282 | 334 |  |  |
Provision for credit losses | 5,715 | 434 |  |  |
Allowance on Individually Measured Loans | 0 | 31 |  |  |
Allowance on Collectively Measured Loans | 17,659 | 8,280 |  |  |
Consumer Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 1,644 | 823 | 1,661 | 883 | 787
Financing Receivable, Allowance for Credit Loss, Writeoff | (268) | (50) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 124 | 15 |  |  |
Provision for credit losses | 127 | 71 |  |  |
Allowance on Individually Measured Loans | 0 | 1 |  |  |
Allowance on Collectively Measured Loans | 1,644 | 822 |  |  |
Unallocated Financing Receivables [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 149 | 581 | 9 | $ 612 | $ 1,150
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |  |  |
Provision for credit losses | 140 | (569) |  |  |
Allowance on Individually Measured Loans | 0 | 0 |  |  |
Allowance on Collectively Measured Loans | $ 149 | $ 581 |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | 1,632 |  |
Accounting Standards Update 2016-13 [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | 7,533 |  |
Accounting Standards Update 2016-13 [Member] | Commercial Business [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | 762 |  |
Accounting Standards Update 2016-13 [Member] | Agriculture [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | (9,325) |  |
Accounting Standards Update 2016-13 [Member] | Construction [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | (1,750) |  |
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | 4,237 |  |
Accounting Standards Update 2016-13 [Member] | Consumer Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | 778 |  |
Accounting Standards Update 2016-13 [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Change in allowance for credit losses due to adoption of new ASU |  |  | $ (603) |  |

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