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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Approximate Fair Value of Investment Securities | The amortized cost and approximate fair value of investment securities as of March 31, 2019 and December 31, 2018 are summarized in the tables below:
| March 31, 2019
(amounts in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale debt securities: |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 306,651 |  |  | $ | 62 |  |  | $ | (2,569 | ) |  | $ | 304,144 |
Corporate notes (1) | 381,334 |  |  | 639 |  |  | (9,695 | ) |  | 372,278 |
Available-for-sale debt securities | $ | 687,985 |  |  | $ | 701 |  |  | $ | (12,264 | ) |  | 676,422 |
Equity securities (2) |  |  |  |  |  |  | 1,720 |
Total investment securities, at fair value |  |  |  |  |  |  | $ | 678,142 |
| December 31, 2018
(amounts in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale debt securities: |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 311,267 |  |  | $ | — |  |  | $ | (5,893 | ) |  | $ | 305,374 |
Corporate notes (1) | 381,407 |  |  | 920 |  |  | (24,407 | ) |  | 357,920 |
Available-for-sale debt securities | $ | 692,674 |  |  | $ | 920 |  |  | $ | (30,300 | ) |  | 663,294 |
Equity securities (2) |  |  |  |  |  |  |  |  |  | 1,718 |
Total investment securities, at fair value |  |  |  |  |  |  |  |  |  | $ | 665,012 |
(1) | Includes corporate securities issued by other bank holding companies.
(2) Includes equity securities issued by a foreign entity.
Summary of Available-for-Sale Debt Securities by Stated Maturity | The following table shows available-for-sale debt securities by stated maturity. Debt securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and, therefore, these debt securities are classified separately with no specific maturity date:
| March 31, 2019
(amounts in thousands) | Amortized Cost |  | Fair Value
Due in one year or less | $ | — |  |  | $ | — |
Due after one year through five years | — |  |  | — |
Due after five years through ten years | 354,268 |  |  | 345,717 |
Due after ten years | 27,066 |  |  | 26,561 |
Agency-guaranteed residential mortgage-backed securities | 306,651 |  |  | 304,144 |
Total debt securities | $ | 687,985 |  |  | $ | 676,422 |
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category | Gross unrealized losses and fair value of Customers' available-for-sale debt securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2019 and December 31, 2018 were as follows:
| March 31, 2019
| Less Than 12 Months |  | 12 Months or More |  | Total
(amounts in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 211,098 |  |  | $ | (2,569 | ) |  | $ | 211,098 |  |  | $ | (2,569 | )
Corporate notes | 21,873 |  |  | (93 | ) |  | 314,767 |  |  | (9,602 | ) |  | 336,640 |  |  | (9,695 | )
Total | $ | 21,873 |  |  | $ | (93 | ) |  | $ | 525,865 |  |  | $ | (12,171 | ) |  | $ | 547,738 |  |  | $ | (12,264 | )
| December 31, 2018
| Less Than 12 Months |  | 12 Months or More |  | Total
(amounts in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 305,374 |  |  | $ | (5,893 | ) |  | $ | — |  |  | $ | — |  |  | $ | 305,374 |  |  | $ | (5,893 | )
Corporate notes | 310,036 |  |  | (24,407 | ) |  | — |  |  | — |  |  | 310,036 |  |  | (24,407 | )
Total | $ | 615,410 |  |  | $ | (30,300 | ) |  | $ | — |  |  | $ | — |  |  | $ | 615,410 |  |  | $ | (30,300 | )

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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