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Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 1,895 | $ 64,776
Due in one to five years | 4,189 | 75,996
Due in five to ten years | 229,469 | 51,162
Due in over ten years | 452,085 | 391,270
Amortized cost, sub-total | 687,638 | 583,204
Amortized cost, AFS debt securities | 1,673,079 | 1,658,779
Fair Value |  |
Due in one year or less | 1,892 | 64,279
Due in one to five years | 4,143 | 71,801
Due in five to ten years | 228,476 | 49,630
Due in over ten years | 437,533 | 372,331
Fair value, sub-total | 672,044 | 558,041
Total AFS debt securities | 1,567,922 | 1,471,973
Mortgage-backed securities - residential |  |
Amortized cost |  |
Mortgage-backed securities | 968,294 | 1,057,389
Amortized cost, AFS debt securities | 968,294 | 1,057,389
Fair Value |  |
Mortgage-backed securities | 879,589 | 896,971
Total AFS debt securities | 879,589 | 896,971
Mortgage-backed securities - commercial |  |
Amortized cost |  |
Mortgage-backed securities | 17,147 | 18,186
Amortized cost, AFS debt securities | 17,147 | 18,186
Fair Value |  |
Mortgage-backed securities | 16,289 | 16,961
Total AFS debt securities | $ 16,289 | $ 16,961

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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