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Note 8 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans held for investment	$ 19,784,702		$ 19,375,955
Less: Allowance for loan losses	(173,531)	$ (173,936)	(161,765)	$ (153,404)	$ (154,589)	$ (154,562)
Unamortized deferred loan fees, net	(13,834)		(10,541)
Loans held for investment, net	19,597,337		19,203,649
Loans held for sale	13,338		0
Commercial Portfolio Segment [Member]
Loans held for investment	3,194,724		3,098,004
Less: Allowance for loan losses	(40,842)	(69,023)	(57,796)	(48,588)	(51,290)	(53,791)
Real Estate Construction Portfolio Segment [Member]
Loans held for investment	301,125		319,649
Less: Allowance for loan losses	(5,434)	(8,540)	(8,185)	(8,912)	(8,539)	(8,180)
Commercial Real Estate Portfolio Segment [Member]
Loans held for investment	10,363,109		10,033,830
Less: Allowance for loan losses	(106,773)	(80,901)	(79,597)	(78,465)	(77,049)	(74,428)
Residential Portfolio Segment [Member]
Loans held for investment	5,692,142		5,689,097
Equity Lines Portfolio Segment [Member]
Loans held for investment	230,001		229,995
Installment and Other Loans [Member ]
Loans held for investment	3,601		5,380
Less: Allowance for loan losses	$ (17)	$ (17)	$ (6)	$ (23)	$ (10)	$ (23)

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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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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X

- Definition

Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 20
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481569/310-20-50-3

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- Definition

Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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