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Investment Securities and Equity Securities with Readily Determinable Fair Values (Contractual Maturities and Estimated Fair Values) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Held-to-maturity debt securities amortized cost disclosures |  |  |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 1,200 |  | $ 1,200 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 2,200 |  | 2,200 |  |
Amortized cost, held-to-maturity debt securities | 3,400 |  | 3,400 |  | $ 2,400
Held-to-maturity debt securities, Estimated fair value disclosures |  |  |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 1,200 |  | 1,200 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 2,200 |  | 2,200 |  |
Estimated fair value | 3,400 |  | 3,400 |  | 2,400
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 355 |  | 355 |  |
Due after ten years, available-for-sale debt securities amortized cost | 70,938 |  | 70,938 |  |
Residential mortgage-backed securities, amortized cost | 2,973,842 |  | 2,973,842 |  |
Amortized cost, Available-for-sale securities | 3,045,135 |  | 3,045,135 |  | 3,376,070
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 356 |  | 356 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 73,965 |  | 73,965 |  |
Residential mortgage-backed securities, Estimated Fair Value | 3,023,413 |  | 3,023,413 |  |
Estimated fair value, Available for sale securities | 3,097,734 |  | 3,097,734 |  | $ 3,378,923
Proceeds from sales and calls of available for sale securities | 0 | $ 19,275 | 18,920 | $ 60,695 |
Proceeds from sales of mortgage-backed securities | 0 | 0 | 0 | 0 |
Gross gains realized on sales | 0 | 1 | 0 | 3 |
Gross losses realized on sales | 0 | $ 7 | 5 | $ 13 |
Collateral Pledged |  |  |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Amortized cost, Available-for-sale securities | 1,151,578 |  | 1,151,578 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Fair value of available for sale investment securities pledged | $ 1,170,646 |  | $ 1,170,646 |  |

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