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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)

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- 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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- 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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- 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 + Details
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- 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 + Details
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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 + Details
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