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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Loans held for investment | $ 20,104,716 | $ 19,375,955
Recorded investment | 165,632 | 169,161
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 73,529 | 86,041
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 25,702 | 20,860
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 110 | 4,050
Financial Asset, Past Due [Member] |  |
Loans held for investment | 264,973 | 280,112
Recorded investment | 165,632 | 169,161
Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 19,839,743 | 19,095,843
Commercial Portfolio Segment [Member] |  |
Loans held for investment | 3,212,907 | 3,098,004
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 44,017 | 25,164
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 1,715 | 275
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 110 | 2,590
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 79,532 | 87,796
Recorded investment | 33,690 | 59,767
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 3,133,375 | 3,010,208
Real Estate Construction Portfolio Segment [Member] |  |
Loans held for investment | 356,215 | 319,649
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 2,532 | 5,334
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
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 | 2,532 | 5,334
Recorded investment | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 353,683 | 314,315
Commercial Real Estate Portfolio Segment [Member] |  |
Loans held for investment | 10,484,939 | 10,033,830
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 26,942 | 16,525
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 11,721 | 13,934
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans held for investment | 0 | 1,460
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans held for investment | 141,821 | 115,047
Recorded investment | 103,158 | 83,128
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 10,343,118 | 9,918,783
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans held for investment | 6,047,394 | 5,919,092
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 38 | 39,018
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans held for investment | 12,266 | 6,651
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 | 41,088 | 71,935
Recorded investment | 28,784 | 26,266
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | 6,006,306 | 5,847,157
Installment and Other Loans [Member ] |  |
Loans held for investment | 3,261 | 5,380
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans held for investment | 0 | 0
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 | 0
Recorded investment | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans held for investment | $ 3,261 | $ 5,380

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