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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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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 | $ 9,521,385 |  | $ 9,427,660 |  |  |
Financing Receivable, Allowance for Credit Loss | (142,785) | $ (142,988) | (149,140) | $ (156,968) | $ (151,546) | $ (83,968)
Loans and Leases Receivable, Net Amount | 9,378,600 |  | 9,278,520 |  |  |
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 | 4,088,484 |  | 4,062,313 |  |  |
Financing Receivable, Allowance for Credit Loss | (51,752) | (53,250) | (68,934) | (61,324) | (50,233) | (20,340)
Commercial Business [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 3,436,351 |  | 3,597,968 |  |  |
Financing Receivable, Allowance for Credit Loss | (55,561) | (57,554) | (45,250) | (50,572) | (53,186) | (30,292)
Agriculture [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 815,985 |  | 779,627 |  |  |
Financing Receivable, Allowance for Credit Loss | (8,965) | (7,920) | (9,052) | (12,461) | (14,868) | (15,835)
Construction [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 326,569 |  | 268,663 |  |  |
Financing Receivable, Allowance for Credit Loss | (6,367) | (6,559) | (7,636) | (8,963) | (7,953) | (8,571)
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 | 823,877 |  | 683,570 |  |  |
Financing Receivable, Allowance for Credit Loss | (18,855) | (16,519) | (16,875) | (22,107) | (23,711) | (7,435)
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 30,119 |  | 35,519 |  |  |
Financing Receivable, Allowance for Credit Loss | $ (1,285) | $ (1,186) | $ (1,393) | $ (1,541) | $ (1,595) | $ (883)

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