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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loans held for investment	$ 19,373,593	$ 19,548,140
Recorded investment	162,834	66,681
Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	15,274	124,698
Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	14,534	38,941
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans held for investment	6,931	7,157
Financial Asset, Past Due [Member]
Loans held for investment	199,573	237,477
Recorded investment	162,834	66,681
Financial Asset, Not Past Due [Member]
Loans held for investment	19,174,020	19,310,663
Commercial Portfolio Segment [Member]
Loans held for investment	3,106,994	3,305,048
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	4,019	11,771
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	2,007	7,770
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans held for investment	6,931	508
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans held for investment	65,031	34,453
Recorded investment	52,074	14,404
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	3,041,963	3,270,595
Real Estate Construction Portfolio Segment [Member]
Loans held for investment	307,057	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	3,497	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	3,497	56,123
Recorded investment	0	7,736
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	303,560	366,524
Commercial Real Estate Portfolio Segment [Member]
Loans held for investment	9,975,272	9,729,581
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	9,615	27,900
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	0	1,503
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans held for investment	0	6,649
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans held for investment	97,192	68,082
Recorded investment	87,577	32,030
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	9,878,080	9,661,499
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans held for investment	5,977,384	6,084,666
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	1,603	59,606
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	9,030	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	33,816	78,787
Recorded investment	23,183	12,511
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	5,943,568	6,005,879
Installment and Other Loans [Member ]
Loans held for investment	6,886	6,198
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	37	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	37	32
Recorded investment	0	0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member]
Loans held for investment	$ 6,849	$ 6,166

X

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Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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