Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Section 40
-Paragraph 7
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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LOANS HELD FOR INVESTMENT - Additional Information V (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 13,091,077		$ 13,091,077		$ 13,125,356
Loans modified to borrowers experiencing financial difficulty	4,096	$ 3,017	43,161	$ 146,136
Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,545,362		2,545,362		2,498,164
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	195,267		195,267		265,568
Loans modified to borrowers experiencing financial difficulty	0	0	0	$ 119
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,290		2,290		1,928
Commercial Portfolio Segment [Member] \| Government [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	215,000		215,000		215,500
Commercial Portfolio Segment [Member] \| Government [Member] \| V I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	168,300		168,300		138,700
Commercial Portfolio Segment [Member] \| Government [Member] \| Public Corporation [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	32,400		32,400
Commercial Portfolio Segment [Member] \| Government [Member] \| Property Tax Revenue [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	155,400		155,400
Commercial Portfolio Segment [Member] \| Government [Member] \| Municipal Special Obligation Bond [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	18,600		18,600
Commercial Portfolio Segment [Member] \| Government [Member] \| Puerto Rico Electric Power Authority [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,600		8,600
Commercial Portfolio Segment [Member] \| Government [Member] \| Low-Income Housing Tax Credit And Community Development Block Grant-Disaster Recovery [Member] \| Construction Loans [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	81,600		81,600		92,400
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,914,898		2,914,898		2,908,302
Residential Portfolio Segment [Member] \| Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	536,510		536,510		530,698
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	88,339		88,339		88,720
Loans modified to borrowers experiencing financial difficulty	800	$ 1,400
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member] \| Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,332		1,332		1,085
Residential Portfolio Segment [Member] \| Government [Member] \| Puerto Rico Housing Finance Authority [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 66,000		$ 66,000		$ 67,100
Product Concentration Risk [Member] \| Loans and Finance Receivables [Member] \| Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	77.00%
Product Concentration Risk [Member] \| Loans and Finance Receivables [Member] \| Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	19.00%
Product Concentration Risk [Member] \| Loans and Finance Receivables [Member] \| USVI and BVI [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	4.00%