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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | $ 158,438 | $ 155,578 | $ 149,140 |  | $ 83,968
Initial ACL recorded for PCD loans acquired |  | 2,616 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 4,449 | 9,063 | 21,092 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 5,359 | 8,085 | 6,932 |  |
Provision (recapture) for credit losses | 1,950 | 4,800 | 77,700 |  |
Commercial Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 54,856 | 61,254 | 68,934 |  | 20,340
Initial ACL recorded for PCD loans acquired |  | 2,225 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 299 | 1,044 | 1,419 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 207 | 633 | 131 |  |
Provision (recapture) for credit losses | (6,306) | (9,494) | 42,349 |  |
Commercial Business |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 57,836 | 54,712 | 45,250 |  | 30,292
Initial ACL recorded for PCD loans acquired |  | 30 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 2,108 | 6,364 | 12,396 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,183 | 4,862 | 3,438 |  |
Provision (recapture) for credit losses | 3,049 | 10,934 | 23,154 |  |
Agriculture |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 9,071 | 8,148 | 9,052 |  | 15,835
Initial ACL recorded for PCD loans acquired |  | 38 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 799 | 322 | 6,427 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 869 | 355 | 172 |  |
Provision (recapture) for credit losses | 853 | (975) | 8,797 |  |
Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 13,142 | 5,397 | 7,636 |  | 8,571
Initial ACL recorded for PCD loans acquired |  | 35 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 387 | 593 | 709 |  |
Provision (recapture) for credit losses | 7,358 | (2,867) | 106 |  |
Real estate: One-to-four family residential |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 22,355 | 24,123 | 16,875 |  | 7,435
Initial ACL recorded for PCD loans acquired |  | 286 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 3 | 170 | 84 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 943 | 907 | 2,083 |  |
Provision (recapture) for credit losses | (2,708) | 6,225 | 3,204 |  |
Consumer Loan |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss | 1,178 | 1,944 | 1,393 |  | 883
Initial ACL recorded for PCD loans acquired |  | 2 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1,240 | 1,163 | 766 |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 770 | 735 | 399 |  |
Provision (recapture) for credit losses | $ (296) | 977 | 99 |  |
Unallocated Financing Receivables [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for Credit Loss |  | 0 | 0 |  | $ 612
Initial ACL recorded for PCD loans acquired |  | 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 0 | 0 |  |
Provision (recapture) for credit losses |  | $ 0 | $ (9) |  |
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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