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Investment Securities - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale, transfer to held-to-maturity | $ 1,990,000,000 | $ 500,800,000 |
Debt securities, held-to-maturity transfer, unrealized gain | 147,000,000 |  |
Debt securities, held-to-maturity transfer, unrealized loss | 690,000 |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) | 0 |  |
Held to maturity mortgage backed securities | 3,761,094,000 | 1,530,500,000 |
Available for sale mortgage backed securities | 4,331,413,000 | 7,130,861,000 |
Held-to-maturity, interest receivable | 20,700,000 |  |
Available-for-sale, interest receivable | 16,700,000 |  |
Available-for-sale securities | 3,852,854,000 | 7,113,545,000 |
Securities valued at less than historical cost, amount | $ 3,796,281,000 |  |
Securities valued at less than historical cost (as percent) | 98.50% |  |
Securities - AFS | $ 0 | (312,000) | $ (61,000)
Provision for credit losses |  | 312,000 |
Securities pledged as collateral | 3,960,000,000 | 3,880,000,000 |
Realized gains | 46,000 | 15,900,000 | 54,800,000
Realized losses | $ 324,000 | $ 422,000 | $ 15,000
Income tax benefit related to security gains (losses) (as percent) | 26.135% | 26.135% | 26.135%
Commercial Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Held to maturity mortgage backed securities | $ 149,200,000 | $ 4,900,000 |
Available for sale mortgage backed securities | 1,070,000,000.00 | 1,530,000,000 |
Residential Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Held to maturity mortgage backed securities | 1,040,000,000.00 | 65,500,000 |
Available for sale mortgage backed securities | 1,470,000,000 | 2,920,000,000 |
Bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investments sold, amount | $ 0 | $ 342,600,000 | $ 1,700,000,000

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