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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2018 and December 31, 2017 are summarized in the tables below:
| September 30, 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 | $ | 316,785 |  |  | $ | — |  |  | $ | (11,367 | ) |  | $ | 305,418 |
Corporate notes | 381,475 |  |  | 347 |  |  | (20,208 | ) |  | 361,614 |
Available-for-sale debt securities | $ | 698,260 |  |  | $ | 347 |  |  | $ | (31,575 | ) |  | 667,032 |
Equity securities (1) |  |  |  |  |  |  | 1,819 |
Total investment securities, at fair value |  |  |  |  |  |  | $ | 668,851 |
(1) 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.
Available-for-sale Securities | The following table presents proceeds from the sale of investment securities and gross gains and gross losses realized on those sales for the three and nine month periods ended September 30, 2018 and 2017:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
(amounts in thousands) |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities | $ | 476,182 |  |  | $ | 554,540 |  |  | $ | 476,182 |  |  | $ | 670,522 |
Gross gains | $ | — |  |  | $ | 5,349 |  |  | $ | — |  |  | $ | 8,532 |
Gross losses | (18,659 | ) |  | — |  |  | (18,659 | ) |  | — |
Net (losses)/gains | $ | (18,659 | ) |  | $ | 5,349 |  |  | $ | (18,659 | ) |  | $ | 8,532 |
Summary of Available-for-Sale Debt Securities by Stated Maturity | The following table shows 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:
| September 30, 2018
| 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 | 229,807 |  |  | 218,904 |
Due after ten years | 151,668 |  |  | 142,710 |
Agency-guaranteed residential mortgage-backed securities | 316,785 |  |  | 305,418 |
Total debt securities | $ | 698,260 |  |  | $ | 667,032 |
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 September 30, 2018 and December 31, 2017 were as follows:
| September 30, 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 | $ | 305,418 |  |  | $ | (11,367 | ) |  | $ | — |  |  | $ | — |  |  | $ | 305,418 |  |  | $ | (11,367 | )
Corporate notes | 321,303 |  |  | (20,208 | ) |  | — |  |  | — |  |  | 321,303 |  |  | (20,208 | )
Total | $ | 626,721 |  |  | $ | (31,575 | ) |  | $ | — |  |  | $ | — |  |  | $ | 626,721 |  |  | $ | (31,575 | )
| 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 real estate 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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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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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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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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