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Securities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2013 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities |  |  |  |  | $ 536,000,000 |
Unrealized net loss on securities transferred from available-for-sale to held-to-maturity, gross |  |  |  |  | $ 13,300,000 |
Realized gain or losses on the sale of available-for-sale securities | $ 0 | $ 244,000 | $ 0 | $ 244,000 |  |
Corporate debt securities, callable, amortized cost | 29,400,000 |  | 29,400,000 |  |  |
Corporate debt securities, callable, estimated fair value | 31,000,000 |  | 31,000,000 |  |  |
Securities pledged for other debt obligations, at fair value | 993,000,000 |  | 993,000,000 |  |  | $ 435,900,000
Equity investments | 101,314,000 |  | 101,314,000 |  |  | 107,079,000
Reverse Repurchase Agreement |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Securities pledged for repurchase agreements, at fair value | $ 150,700,000 |  | $ 150,700,000 |  |  | $ 152,700,000

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- Definition Available For Sale And Held To Maturity Securities Amount Callable Amortized Cost + References No definition available. + Details
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- Definition Available For Sale And Held To Maturity Securities Amount Callable Fair Value Disclosure + References No definition available. + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of other debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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