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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Loans | $ 8,863,504 | $ 8,686,523
Past Due Loans | 22,170 | 23,882
Nonaccrual Loans | 47,647 | 33,060
Total Loans | 8,933,321 | 8,743,465
Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 3,957,092 | 3,935,633
Past Due Loans | 7,364 | 6,421
Nonaccrual Loans | 5,518 | 3,799
Total Loans | 3,969,974 | 3,945,853
Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 3,140,629 | 2,959,826
Past Due Loans | 4,644 | 8,850
Nonaccrual Loans | 24,395 | 20,937
Total Loans | 3,169,668 | 2,989,613
Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 735,186 | 755,719
Past Due Loans | 4,222 | 4,629
Nonaccrual Loans | 15,083 | 5,023
Total Loans | 754,491 | 765,371
Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 305,948 | 360,582
Past Due Loans | 2,238 | 951
Nonaccrual Loans | 0 | 0
Total Loans | 308,186 | 361,533
One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 684,248 | 631,109
Past Due Loans | 3,615 | 2,924
Nonaccrual Loans | 2,643 | 3,292
Total Loans | 690,506 | 637,325
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 40,401 | 43,654
Past Due Loans | 87 | 107
Nonaccrual Loans | 8 | 9
Total Loans | 40,496 | 43,770
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 16,763 | 18,332
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 5,899 | 6,421
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 3,055 | 6,081
Financial Asset, 30 to 59 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 2,462 | 2,283
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 2,238 | 951
Financial Asset, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 3,071 | 2,516
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 38 | 80
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 5,407 | 5,550
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 1,465 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 1,589 | 2,769
Financial Asset, 60 to 89 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 1,760 | 2,346
Financial Asset, 60 to 89 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 544 | 408
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 49 | 27
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | $ 0 | $ 0

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