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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loans held for investment | $ 19,429,396 | $ 19,548,140
Recorded investment | 98,107 | 66,681
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 112,864 | 124,698
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 36,331 | 38,941
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 7,560 | 7,157
Financial Asset, Past Due [Member] |  |
Loans held for investment | 254,862 | 237,477
Recorded investment | 98,107 | 66,681
Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 19,174,534 | 19,310,663
Commercial Portfolio Segment [Member] |  |
Loans held for investment | 3,132,580 | 3,305,048
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 25,777 | 11,771
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 21,857 | 7,770
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 6,060 | 508
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 68,336 | 34,453
Recorded investment | 14,642 | 14,404
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 3,064,244 | 3,270,595
Real Estate Construction Portfolio Segment [Member] |  |
Loans held for investment | 382,775 | 422,647
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 0 | 25,389
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 0 | 22,998
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 22,998 | 56,123
Recorded investment | 22,998 | 7,736
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 359,777 | 366,524
Commercial Real Estate Portfolio Segment [Member] |  |
Loans held for investment | 9,821,807 | 9,729,581
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 25,684 | 27,900
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 13,803 | 1,503
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 1,500 | 6,649
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 88,452 | 68,082
Recorded investment | 47,465 | 32,030
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 9,733,355 | 9,661,499
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans held for investment | 6,087,068 | 6,084,666
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 61,403 | 59,606
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 671 | 6,670
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 75,076 | 78,787
Recorded investment | 13,002 | 12,511
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 6,011,992 | 6,005,879
Installment and Other Loans [Member ] |  |
Loans held for investment | 5,166 | 6,198
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 0 | 32
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 0 | 32
Recorded investment | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | $ 5,166 | $ 6,166

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