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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Loans | $ 9,364,697 | $ 8,686,523
Total Past Due | 28,157 | 23,882
Nonaccrual Loans | 34,806 | 33,060
Total Loans, before allowance for credit loss | 9,427,660 | 8,743,465
Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 4,037,309 | 3,935,633
Total Past Due | 17,292 | 6,421
Nonaccrual Loans | 7,712 | 3,799
Total Loans, before allowance for credit loss | 4,062,313 | 3,945,853
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 3,578,905 | 2,959,826
Total Past Due | 5,841 | 8,850
Nonaccrual Loans | 13,222 | 20,937
Total Loans, before allowance for credit loss | 3,597,968 | 2,989,613
Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 767,102 | 755,719
Total Past Due | 911 | 4,629
Nonaccrual Loans | 11,614 | 5,023
Total Loans, before allowance for credit loss | 779,627 | 765,371
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 268,304 | 360,582
Total Past Due | 142 | 951
Nonaccrual Loans | 217 | 0
Total Loans, before allowance for credit loss | 268,663 | 361,533
Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 677,627 | 631,109
Total Past Due | 3,942 | 2,924
Nonaccrual Loans | 2,001 | 3,292
Total Loans, before allowance for credit loss | 683,570 | 637,325
Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 35,450 | 43,654
Total Past Due | 29 | 107
Nonaccrual Loans | 40 | 9
Total Loans, before allowance for credit loss | 35,519 | 43,770
Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 21,792 | 18,332
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,292 | 6,421
Financial Asset, 30 to 59 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,282 | 6,081
Financial Asset, 30 to 59 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 911 | 2,283
Financial Asset, 30 to 59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 951
Financial Asset, 30 to 59 Days Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,283 | 2,516
Financial Asset, 30 to 59 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 24 | 80
Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,365 | 5,550
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,559 | 2,769
Financial Asset, 60 to 89 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 2,346
Financial Asset, 60 to 89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 142 | 0
Financial Asset, 60 to 89 Days Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,659 | 408
Financial Asset, 60 to 89 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5 | 27
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 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] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 0

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