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Securities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2013
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities |  |  |  |  | $ 12,700,000 | $ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross |  |  |  |  | 209,000 | $ 13,300,000
Debt securities, available-for-sale, realized gain (loss) | $ 131,000 | $ 0 | $ 23,000 | $ 0 |  |
Debt securities, held to maturity | 1,027,712,000 |  | 1,027,712,000 |  | 1,139,193,000 |
Equity investments | 81,722,000 |  | 81,722,000 |  | 101,155,000 |
Federal Home Loan Bank Advances, Federal Reserve Discount Window And Other Borrowings |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, held to maturity | 866,500,000 |  | 866,500,000 |  | 1,140,000,000 |
Securities Sold under Agreements to Repurchase |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, held to maturity | 105,500,000 |  | 105,500,000 |  | $ 142,900,000 |
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, amortized cost | 56,000,000 |  | 56,000,000 |  |  |
Debt securities, fair value | 52,700,000 |  | 52,700,000 |  |  |
State, municipal and sovereign debt obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, amortized cost | 75,000,000 |  | 75,000,000 |  |  |
Debt securities, fair value | 68,700,000 |  | 68,700,000 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, amortized cost | 296,200,000 |  | 296,200,000 |  |  |
Debt securities, fair value | $ 274,900,000 |  | $ 274,900,000 |  |  |

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- Definition Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and 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 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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