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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amortized Cost |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 2,200,000 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 1,200,000 |  |
Amortized cost, held-to-maturity debt securities | 3,400,000 | $ 3,400,000 |
Fair Value |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 2,200,000 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,200,000 |  |
Estimated fair value | 3,400,000 | 3,400,000 |
Available-for-sale debt securities amortized cost disclosures |  |  |
Due after ten years, available-for-sale debt securities amortized cost | 41,519,000 |  |
Residential mortgage-backed securities, amortized cost | 4,213,441,000 |  |
Amortized cost, Available-for-sale securities | 4,254,960,000 | 3,054,289,000 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 44,557,000 |  |
Residential mortgage-backed securities, Estimated Fair Value | 4,169,363,000 |  |
Estimated fair value, Available for sale securities | 4,213,920,000 | 3,080,768,000 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Proceeds from sales and calls of available for sale securities | 5,890,000 | 42,350,000 | $ 94,585,000
Proceeds from sales and calls of available for sale securities | 5,890,000 | 42,350,000 | 94,585,000
Proceeds from sales of mortgage-backed securities | 0 | 0 | 0
Gross gains realized on sales | 0 | 1,000 | 3,000
Gross losses realized on sales | 16,000 | $ 6,000 | $ 15,000
Collateral Pledged |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |
Amortized cost, Available-for-sale securities | 1,519,652,000 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Fair value of available for sale investment securities pledged | $ 1,497,929,000 |  |

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