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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 11,322,387 |  | $ 10,641,937 |  |  |
Financing Receivable, Allowance for Credit Loss | (149,935) | $ (146,949) | (155,578) | $ (142,988) | $ (148,294) | $ (149,140)
Loans and Leases Receivable, Net Amount | 11,172,452 |  | 10,486,359 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 5,251,100 |  | 4,981,263 |  |  |
Financing Receivable, Allowance for Credit Loss | (57,119) | (57,307) | (61,254) | (53,250) | (57,050) | (68,934)
Commercial Business [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 3,646,956 |  | 3,423,268 |  |  |
Financing Receivable, Allowance for Credit Loss | (51,985) | (50,474) | (54,712) | (57,554) | (58,405) | (45,250)
Agriculture [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 853,099 |  | 795,715 |  |  |
Financing Receivable, Allowance for Credit Loss | (8,895) | (8,010) | (8,148) | (7,920) | (9,487) | (9,052)
Construction [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 482,211 |  | 384,755 |  |  |
Financing Receivable, Allowance for Credit Loss | (5,914) | (5,399) | (5,397) | (6,559) | (6,551) | (7,636)
One-to-Four Family Residential [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,042,190 |  | 1,013,908 |  |  |
Financing Receivable, Allowance for Credit Loss | (24,626) | (24,356) | (24,123) | (16,519) | (15,638) | (16,875)
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 46,831 |  | 43,028 |  |  |
Financing Receivable, Allowance for Credit Loss | $ (1,396) | $ (1,403) | $ (1,944) | $ (1,186) | $ (1,163) | $ (1,393)

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