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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 540,310 |
Due from one year to five years | 259,375 |
Due from five to ten years | 71,452 |
Due after ten years | 11,797 |
Mortgage-backed securities | 695,603 |
Amortized Cost | 1,578,537 | $ 1,447,637
Estimated Fair Value |  |
Due in one year or less | 534,603 |
Due from one year to five years | 253,938 |
Due from five to ten years | 70,068 |
Due after ten years | 10,410 |
Mortgage-backed securities | 662,028 |
Estimated Fair Value | 1,531,047 | 1,402,944
Amortized Cost |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five to ten years | 0 |
Due after ten years | 33,664 |
Mortgage-backed securities | 114,874 |
Amortized Cost | 148,538 | 141,512
Estimated Fair Value |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five to ten years | 0 |
Due after ten years | 27,880 |
Mortgage-backed securities | 100,418 |
Estimated Fair Value | $ 128,298 | $ 122,731

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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant