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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
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 December 31, 2018 and 2017, are summarized as follows:
| December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |
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 that are being measured at fair value with changes in fair value recognized directly in earnings effective January 1, 2018 as a result of adopting ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (see NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for additional information related to the adoption of this new standard).
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 186,221 |  |  | $ | 36 |  |  | $ | (2,799 | ) |  | $ | 183,458 |
Agency-guaranteed commercial real estate mortgage-backed securities | 238,809 |  |  | 432 |  |  | (769 | ) |  | 238,472 |
Corporate notes (1) | 44,959 |  |  | 1,130 |  |  | — |  |  | 46,089 |
Equity securities (2) | 2,311 |  |  | 1,041 |  |  | — |  |  | 3,352 |
Total available-for-sale securities, at fair value | $ | 472,300 |  |  | $ | 2,639 |  |  | $ | (3,568 | ) |  | $ | 471,371 |
(1) | Includes subordinated debt issued by other bank holding companies.
(2) | Includes equity securities issued by a foreign entity.
Statement of Proceeds from Sale of Available for Sale Investment Securities | The following table shows proceeds from the sale of available-for-sale securities, gross gains and gross losses on those sales of securities:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
(amounts in thousands) |  |  |  |  |
Proceeds from sale of available-for-sale securities | $ | 476,182 |  |  | $ | 769,203 |  |  | $ | 2,852 |
Gross gains | $ | — |  |  | $ | 8,808 |  |  | $ | 26 |
Gross losses | (18,659 | ) |  | (8 | ) |  | (1 | )
Net (losses) gains | $ | (18,659 | ) |  | $ | 8,800 |  |  | $ | 25 |
Summary of Investment 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 are, therefore, classified separately with no specific maturity date:
| December 31, 2018
| Available for Sale
| Amortized Cost |  | Fair Value
(amounts in thousands) |  |  |
Due in one year or less | $ | — |  |  | $ | — |
Due after one year through five years | — |  |  | — |
Due after five years through ten years | 329,096 |  |  | 308,578 |
Due after ten years | 52,311 |  |  | 49,342 |
Agency-guaranteed residential mortgage-backed securities | 311,267 |  |  | 305,374 |
Total available-for-sale debt securities | $ | 692,674 |  |  | $ | 663,294 |
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 December 31, 2018 and 2017 were as follows:
| December 31, 2018
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 305,374 |  |  | $ | (5,893 | ) |  | $ | — |  |  | $ | — |  |  | $ | 305,374 |  |  | $ | (5,893 | )
Corporate notes (1) | 310,036 |  |  | (24,407 | ) |  | — |  |  | — |  |  | 310,036 |  |  | (24,407 | )
Total | $ | 615,410 |  |  | $ | (30,300 | ) |  | $ | — |  |  | $ | — |  |  | $ | 615,410 |  |  | $ | (30,300 | )
(1) | Includes corporate securities issued by other bank holding companies.
| December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 104,861 |  |  | $ | (656 | ) |  | $ | 66,579 |  |  | $ | (2,143 | ) |  | $ | 171,440 |  |  | $ | (2,799 | )
Agency-guaranteed commercial mortgage-backed securities | 115,970 |  |  | (740 | ) |  | 6,151 |  |  | (29 | ) |  | 122,121 |  |  | (769 | )
Total | $ | 220,831 |  |  | $ | (1,396 | ) |  | $ | 72,730 |  |  | $ | (2,172 | ) |  | $ | 293,561 |  |  | $ | (3,568 | )

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