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Investment Securities - Schedule of Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale, amortized cost, one year or less | $ 10,889 |
Available-for-sale, amortized cost, after one through five years | 104,625 |
Available-for-sale, amortized cost, after five through ten years | 138,009 |
Available-for-sale, amortized cost, after ten years | 1,023,532 |
Available-for-sale, amortized cost, securities not due on a single maturity date | 2,446,711 |
Available-for-sale, amortized cost, other securities (no maturity) | 208 |
Amortized Cost | 3,723,974 | $ 2,852,774
Available-for-sale, fair value, one year or less | 10,792 |
Available-for-sale, fair value, after one through five years | 104,255 |
Available-for-sale, fair value, after five through ten years | 130,883 |
Available-for-sale, fair value, after ten years | 823,546 |
Available-for-sale, fair value, securities not due on a single maturity date | 2,249,593 |
Available-for-sale, fair value, other securities (no maturity) | 208 |
Available-for-sale, fair value, total | $ 3,319,277 | $ 2,529,426

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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 sixth through tenth 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Fair value 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 sixth through tenth 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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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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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