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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Transfers out of Level 3 | $ 0 |
Available-for-sale Securities |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 1 |
Recurring | Other investments |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 157,140,000 | $ 130,982,000
Total realized gains (losses) included in income | (714,000) | 2,360,000
Changes in unrealized gains/losses included in other comprehensive income (loss) | 0 | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0
Purchases | 7,467,000 | 9,202,000
Issuances | 0 | 0
Settlements | (1,658,000) | (1,534,000)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 162,235,000 | 141,010,000
Total realized gains (losses) included in income | (714,000) | 2,360,000
Recurring | Available-for-sale Securities |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 479,000 | 629,000
Total realized gains (losses) included in income | 13,000 | 1,000
Changes in unrealized gains/losses included in other comprehensive income (loss) | 16,000 | 8,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 12,841,000 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Settlements | (165,000) | (159,000)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 13,184,000 | 479,000
Total realized gains (losses) included in income | 13,000 | $ 1,000
Recurring | Servicing Contracts |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 0 |
Total realized gains (losses) included in income | 11,812,000 |
Changes in unrealized gains/losses included in other comprehensive income (loss) | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |
Purchases | 0 |
Issuances | 0 |
Settlements | 0 |
Transfers out of Level 3 | 0 |
Fair value, end of period | 11,812,000 |
Total realized gains (losses) included in income | $ 11,812,000 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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