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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

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
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