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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 |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 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 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 1,325 |  |
Amortized cost, held-to-maturity debt securities | 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 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,325 |  |
Estimated fair value | 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 | 2,246 |  |
Due after ten years, available-for-sale debt securities amortized cost | 141,894 |  |
Residential mortgage-backed securities, amortized cost | 3,303,579 |  |
Amortized cost, Available-for-sale securities | 3,447,719 |  | 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 | 2,296 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 144,762 |  |
Residential mortgage-backed securities, Estimated Fair Value | 3,263,030 |  |
Estimated fair value, Available for sale securities | 3,410,088 |  | $ 3,411,350
Proceeds from sales and calls of available for sale securities | 41,420 | $ 18,145 |
Proceeds from sales of mortgage-backed securities | 0 | 0 |
Gross gains realized on sales | 2 | 0 |
Gross losses realized on sales | 6 | $ 0 |
Collateral Pledged |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |
Amortized cost, Available-for-sale securities | 1,183,510 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Fair value of available for sale investment securities pledged | $ 1,165,856 |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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