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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loans held for investment	$ 19,353,003	$ 19,375,955
Recorded investment	154,626	169,161
Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	178,144	86,041
Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	18,843	20,860
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans held for investment	595	4,050
Financial Asset, Past Due [Member]
Loans held for investment	352,208	280,112
Recorded investment	154,626	169,161
Financial Asset, Not Past Due [Member]
Loans held for investment	19,000,795	19,095,843
Commercial Portfolio Segment [Member]
Loans held for investment	2,998,423	3,098,004
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	71,018	25,164
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	294	275
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans held for investment	595	2,590
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans held for investment	125,269	87,796
Recorded investment	53,362	59,767
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	2,873,154	3,010,208
Real Estate Construction Portfolio Segment [Member]
Loans held for investment	332,729	319,649
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	13,806	5,334
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	7,813	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	21,619	5,334
Recorded investment	0	0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	311,110	314,315
Commercial Real Estate Portfolio Segment [Member]
Loans held for investment	10,160,934	10,033,830
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	57,707	16,525
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	7,832	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	142,341	115,047
Recorded investment	76,802	83,128
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	10,018,593	9,918,783
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans held for investment	5,854,748	5,919,092
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	35,413	39,018
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans held for investment	2,904	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	62,779	71,935
Recorded investment	24,462	26,266
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans held for investment	5,791,969	5,847,157
Installment and Other Loans [Member ]
Loans held for investment	6,169	5,380
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans held for investment	200	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	200	0
Recorded investment	0	0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member]
Loans held for investment	$ 5,969	$ 5,380

X

- Definition

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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