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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Loans | $ 9,625,411 | $ 8,686,523
Past Due Loans | 16,305 | 23,882
Nonaccrual Loans | 47,231 | 33,060
Total Loans | 9,688,947 | 8,743,465
Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 4,015,038 | 3,935,633
Past Due Loans | 1,635 | 6,421
Nonaccrual Loans | 10,362 | 3,799
Total Loans | 4,027,035 | 3,945,853
Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 3,808,794 | 2,959,826
Past Due Loans | 7,902 | 8,850
Nonaccrual Loans | 19,313 | 20,937
Total Loans | 3,836,009 | 2,989,613
Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 833,408 | 755,719
Past Due Loans | 1,969 | 4,629
Nonaccrual Loans | 14,913 | 5,023
Total Loans | 850,290 | 765,371
Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 272,959 | 360,582
Past Due Loans | 0 | 951
Nonaccrual Loans | 217 | 0
Total Loans | 273,176 | 361,533
One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 658,468 | 631,109
Past Due Loans | 4,559 | 2,924
Nonaccrual Loans | 2,405 | 3,292
Total Loans | 665,432 | 637,325
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 36,744 | 43,654
Past Due Loans | 240 | 107
Nonaccrual Loans | 21 | 9
Total Loans | 37,005 | 43,770
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 14,018 | 18,332
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 547 | 6,421
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 6,987 | 6,081
Financial Asset, 30 to 59 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 1,710 | 2,283
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 0 | 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 | 4,559 | 2,516
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 215 | 80
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 2,287 | 5,550
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 1,088 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 915 | 2,769
Financial Asset, 60 to 89 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 259 | 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 | 0 | 408
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due Loans | 25 | 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

X
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