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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Held-to-maturity debt securities amortized cost disclosures |  |  |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 1,075 |  | $ 1,075 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 1,325 |  | 1,325 |  |
Amortized cost, held-to-maturity debt securities | 2,400 |  | 2,400 |  | $ 1,200
Held-to-maturity debt securities, Estimated fair value disclosures |  |  |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 1,075 |  | 1,075 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,325 |  | 1,325 |  |
Estimated fair value | 2,400 |  | 2,400 |  | 1,200
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 2,244 |  | 2,244 |  |
Due after ten years, available-for-sale debt securities amortized cost | 122,402 |  | 122,402 |  |
Residential mortgage-backed securities, amortized cost | 3,348,834 |  | 3,348,834 |  |
Amortized cost, Available-for-sale securities | 3,473,480 |  | 3,473,480 |  | 3,481,165
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 2,283 |  | 2,283 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 125,410 |  | 125,410 |  |
Residential mortgage-backed securities, Estimated Fair Value | 3,340,220 |  | 3,340,220 |  |
Estimated fair value, Available for sale securities | 3,467,913 |  | 3,467,913 |  | $ 3,411,350
Proceeds from sales and calls of available for sale securities | 19,275 | $ 0 | 60,695 | $ 18,145 |
Proceeds from sales of mortgage-backed securities | 0 | 0 | 0 | 0 |
Gross gains realized on sales | 1 | 0 | 3 | 0 |
Gross losses realized on sales | 7 | $ 0 | 13 | $ 0 |
Collateral Pledged |  |  |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Amortized cost, Available-for-sale securities | 1,063,745 |  | 1,063,745 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Fair value of available for sale investment securities pledged | $ 1,057,009 |  | $ 1,057,009 |  |

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