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Allowance for Credit Losses and Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | $ 155,578 | $ 149,140 | $ 83,968 |  | $ 83,369
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 2,616 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 9,063 | 21,092 | 15,215 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 8,085 | 6,932 | 12,321 |  |
Provision (recapture) for credit losses | 4,800 | 77,700 | 3,493 |  |
Commercial Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 61,254 | 68,934 | 20,340 |  | 14,864
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 2,225 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1,044 | 1,419 | 2,160 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 633 | 131 | 3,377 |  |
Provision (recapture) for credit losses | (9,494) | 42,349 | 4,259 |  |
Commercial Business |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 54,712 | 45,250 | 30,292 |  | 34,658
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 30 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 6,364 | 12,396 | 11,290 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 4,862 | 3,438 | 3,066 |  |
Provision (recapture) for credit losses | 10,934 | 23,154 | 3,858 |  |
Agriculture |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 8,148 | 9,052 | 15,835 |  | 9,589
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 38 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 322 | 6,427 | 245 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 355 | 172 | 299 |  |
Provision (recapture) for credit losses | (975) | 8,797 | 6,192 |  |
Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 5,397 | 7,636 | 8,571 |  | 14,395
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 35 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 | 242 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 593 | 709 | 3,641 |  |
Provision (recapture) for credit losses | (2,867) | 106 | (9,223) |  |
Real estate: One-to-four family residential |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 24,123 | 16,875 | 7,435 |  | 8,024
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 286 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 170 | 84 | 1,196 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 907 | 2,083 | 1,773 |  |
Provision (recapture) for credit losses | 6,225 | 3,204 | (1,166) |  |
Consumer Loan |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 1,944 | 1,393 | 883 |  | 786
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 2 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1,163 | 766 | 82 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 735 | 399 | 165 |  |
Provision (recapture) for credit losses | $ 977 | 99 | 14 |  |
Unallocated Financing Receivables [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss |  | 0 | 612 |  | $ 1,053
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 0 | 0 |  |
Provision (recapture) for credit losses |  | $ (9) | $ (441) |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | $ 1,632 |
Accounting Standards Update 2016-13 | Commercial Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | 7,533 |
Accounting Standards Update 2016-13 | Commercial Business |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | 762 |
Accounting Standards Update 2016-13 | Agriculture |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | (9,325) |
Accounting Standards Update 2016-13 | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | (1,750) |
Accounting Standards Update 2016-13 | Real estate: One-to-four family residential |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | 4,237 |
Accounting Standards Update 2016-13 | Consumer Loan |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | 778 |
Accounting Standards Update 2016-13 | Unallocated Financing Receivables [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  | $ (603) |

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