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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 10,641,937 | $ 9,427,660
Nonaccrual Loans | 23,041 | 34,806
Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,981,263 | 4,062,313
Nonaccrual Loans | 1,872 | 7,712
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,423,268 | 3,597,968
Nonaccrual Loans | 13,321 | 13,222
Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 795,715 | 779,627
Nonaccrual Loans | 5,396 | 11,614
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 384,755 | 268,663
Nonaccrual Loans | 0 | 217
Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,013,908 | 683,570
Nonaccrual Loans | 2,433 | 2,001
Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 43,028 | 35,519
Nonaccrual Loans | 19 | 40
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,611,528 | 9,364,697
Financial Asset, Not Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,977,781 | 4,037,309
Financial Asset, Not Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,406,539 | 3,578,905
Financial Asset, Not Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 789,112 | 767,102
Financial Asset, Not Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 384,755 | 268,304
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 | 1,010,343 | 677,627
Financial Asset, Not Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 42,998 | 35,450
Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,860 | 21,792
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 17,292
Financial Asset, 30 to 59 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,721 | 1,282
Financial Asset, 30 to 59 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,207 | 911
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 | 921 | 2,283
Financial Asset, 30 to 59 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11 | 24
Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,508 | 6,365
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,610 | 0
Financial Asset, 60 to 89 Days Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 687 | 4,559
Financial Asset, 60 to 89 Days Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 142
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 | 211 | 1,659
Financial Asset, 60 to 89 Days Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 5
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 | 7,368 | 28,157
Financial Asset, Past Due | Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,610 | 17,292
Financial Asset, Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,408 | 5,841
Financial Asset, Past Due | Agriculture |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,207 | 911
Financial Asset, Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 142
Financial Asset, Past Due | Real estate: One-to-four family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,132 | 3,942
Financial Asset, Past Due | Consumer Loan |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 11 | $ 29

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