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LOANS HELD FOR INVESTMENT - Additional Information III (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving loans converted to term loans	$ 0	$ 0
Accrued interest receivable on loans and investments	66,109,000	71,881,000
Nonaccrual	96,261,000	87,467,000
Florida region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	22,700,000	8,600,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	19,650,000	20,514,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	21,437,000	10,851,000
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	5,591,000	1,365,000
Commercial Portfolio Segment [Member] | Florida region [Member] | Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	200,000
Commercial Portfolio Segment [Member] | Florida region [Member] | Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	12,200,000
Collateral Pledged [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial mortgage loan	80,734,000	93,919,000
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial mortgage loan	15,514,000	21,804,000
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial mortgage loan	35,976,000	46,765,000
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial mortgage loan	$ 5,277,000	$ 956,000
Collateral Pledged [Member] | Weighted Average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV Coverage %	69.00%	68.00%
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable on loans and investments	$ 54,700,000	$ 58,200,000

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Amount of investment in collateral dependent financing receivable individually evaluated for purposes of determining the ACL.

+ References

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Debt-to-value (DTV) ratio.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ 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
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477802/946-310-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
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