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Securities - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2013
Investment [Line Items] |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities | $ 536,000,000.0 |  |  | $ 536,000,000.0
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross | $ 13,300,000 |  |  | $ 13,300,000
Realized gains on sale of investment securities |  | $ 476,000 |  |
Debt securities, available-for-sale, realized gain (loss) |  |  | $ 0 |
Less: Net gains recognized on equity securities sold |  | 5,401,000 | 0 |
Corporate debt securities, callable, amortized cost |  | 53,800,000 |  |
Corporate debt securities, callable, estimated fair value |  | 52,900,000 |  |
Estimated fair value of securities pledged for deposits and other purposes |  | 435,900,000 | 475,600,000 |
Equity investments, at estimated fair value |  | 107,079,000 | 10,136,000 |
Reverse Repurchase Agreements |  |  |  |
Investment [Line Items] |  |  |  |
Estimated fair value of securities pledged for reverse repurchase agreements |  | $ 152,700,000 | $ 81,400,000 |

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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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