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Securities - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2013
Investment [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) | 0 | $ 476,000 |
Available-for-sale, amortized cost | 569,874,000 | 180,154,000 |
Available-for-sale, fair value | 568,255,000 | 183,302,000 |
Estimated fair value of securities pledged for deposits and other purposes | 1,140,000,000 | 435,900,000 |
Equity investments | 101,155,000 | 107,079,000 |
Corporate debt securities |  |  |
Investment [Line Items] |  |  |
Available-for-sale, amortized cost | 66,200,000 |  |
Available-for-sale, fair value | 66,400,000 |  |
Corporate debt securities | Investment securities |  |  |
Investment [Line Items] |  |  |
Available-for-sale, amortized cost | 5,000,000 |  |
Available-for-sale, fair value | 5,031,000 |  |
State, municipal, and sovereign debt obligations |  |  |
Investment [Line Items] |  |  |
Available-for-sale, amortized cost | 90,200,000 |  |
Available-for-sale, fair value | 92,500,000 |  |
Asset-backed securities | Investment securities |  |  |
Investment [Line Items] |  |  |
Available-for-sale, amortized cost | 298,976,000 | 6,174,000 |
Available-for-sale, fair value | 297,528,000 | 6,170,000 |
Reverse Repurchase Agreements |  |  |
Investment [Line Items] |  |  |
Estimated fair value of securities pledged for reverse repurchase agreements | $ 142,900,000 | $ 152,700,000 |

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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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