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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,610,973 | $ 10,641,937
Nonaccrual Loans | 13,441 | 23,041
Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,352,785 | 4,981,263
Nonaccrual Loans | 3,244 | 1,872
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,750,564 | 3,423,268
Nonaccrual Loans | 5,133 | 13,321
Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 848,903 | 795,715
Nonaccrual Loans | 4,367 | 5,396
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 540,861 | 384,755
Nonaccrual Loans | 0 | 0
Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,077,494 | 1,013,908
Nonaccrual Loans | 685 | 2,433
Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 40,366 | 43,028
Nonaccrual Loans | 12 | 19
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11,574,480 | 10,611,528
Financial Asset, Not Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,338,999 | 4,977,781
Financial Asset, Not Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,739,731 | 3,406,539
Financial Asset, Not Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 842,506 | 789,112
Financial Asset, Not Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 540,861 | 384,755
Financial Asset, Not Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,072,211 | 1,010,343
Financial Asset, Not Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 40,172 | 42,998
Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,060 | 4,860
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,756 | 0
Financial Asset, 30 to 59 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,336 | 2,721
Financial Asset, 30 to 59 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 493 | 1,207
Financial Asset, 30 to 59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, 30 to 59 Days Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,315 | 921
Financial Asset, 30 to 59 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 160 | 11
Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,992 | 2,508
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,786 | 1,610
Financial Asset, 60 to 89 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,364 | 687
Financial Asset, 60 to 89 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,537 | 0
Financial Asset, 60 to 89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 283 | 211
Financial Asset, 60 to 89 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 22 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 23,052 | 7,368
Financial Asset, Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,542 | 1,610
Financial Asset, Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,700 | 3,408
Financial Asset, Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,030 | 1,207
Financial Asset, Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,598 | 1,132
Financial Asset, Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 182 | $ 11

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