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Investment Securities | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | INVESTMENT SECURITIES The amortized cost and approximate fair value of investment securities as of December 31, 2017 and 2016, are summarized as follows:
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |
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 | $ | 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.
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 233,002 |  |  | $ | 918 |  |  | $ | (2,657 | ) |  | $ | 231,263 |
Agency-guaranteed commercial real estate mortgage-backed securities | 204,689 |  |  | — |  |  | (2,872 | ) |  | 201,817 |
Corporate notes (1) | 44,932 |  |  | 401 |  |  | (185 | ) |  | 45,148 |
Equity securities (2) | 15,246 |  |  | — |  |  | — |  |  | 15,246 |
Total | $ | 497,869 |  |  | $ | 1,319 |  |  | $ | (5,714 | ) |  | $ | 493,474 |
(1) | Includes subordinated debt issued by other bank holding companies.
(2) | Includes equity securities issued by a foreign entity.
The following table shows proceeds from the sale of available-for-sale investment securities, gross gains and gross losses on those sales of securities:
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
(amounts in thousands) |  |  |  |  |
Proceeds from sale of available-for-sale investment securities | $ | 769,203 |  |  | $ | 2,852 |  |  | $ | 806 |
Gross gains | $ | 8,808 |  |  | $ | 26 |  |  | $ | — |
Gross losses | (8 | ) |  | (1 | ) |  | (85 | )
Net gains (losses) | $ | 8,800 |  |  | $ | 25 |  |  | $ | (85 | )
These gains and losses were determined using the specific identification method and were included in non-interest income. The following table shows debt investment securities by stated maturity. Investment 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, 2017
| 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 | 42,959 |  |  | 44,005 |
Due after ten years | 2,000 |  |  | 2,084 |
Agency-guaranteed residential mortgage-backed securities | 186,221 |  |  | 183,458 |
Agency-guaranteed commercial mortgage-backed securities | 238,809 |  |  | 238,472 |
Total debt securities | $ | 469,989 |  |  | $ | 468,019 |
Gross unrealized losses and fair value of Customers' investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows:
| 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 |  |  |  |  |  |  |
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 | )
| December 31, 2016
| 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 |  |  |  |  |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | 87,433 |  |  | $ | (1,330 | ) |  | $ | 30,592 |  |  | $ | (1,327 | ) |  | $ | 118,025 |  |  | $ | (2,657 | )
Agency-guaranteed commercial mortgage-backed securities | 201,817 |  |  | (2,872 | ) |  | — |  |  | — |  |  | 201,817 |  |  | (2,872 | )
Corporate notes (1) | 9,747 |  |  | (185 | ) |  | — |  |  | — |  |  | 9,747 |  |  | (185 | )
Total | $ | 298,997 |  |  | $ | (4,387 | ) |  | $ | 30,592 |  |  | $ | (1,327 | ) |  | $ | 329,589 |  |  | $ | (5,714 | )
(1) | Includes subordinated debt issued by other bank holding companies.
At December 31, 2017, there were twenty available-for-sale investment securities in the less-than-twelve-month category and sixteen available-for-sale investment securities in the twelve-month-or-more category. The unrealized losses on the mortgage- backed securities are guaranteed by government-sponsored entities and primarily relate to changes in market interest rates. All amounts are expected to be recovered when market prices recover or at maturity. Customers does not intend to sell these securities, and it is not more likely than not that Customers will be required to sell the securities before recovery of the amortized cost basis. During the year ended December 31, 2017, Customers recorded other-than-temporary impairment losses of $12.9 million related to its equity holdings in Religare for the full amount of the decline in fair value from the cost basis established at December 31, 2016 through September 30, 2017, because Customers no longer has the intent to hold these securities until a recovery in fair value. The fair value of the Religare equity securities at September 30, 2017, of $2.3 million became the new cost basis of the securities. At December 31, 2017, the fair value of the Religare equity securities was $3.4 million which resulted in an unrealized gain of $1.0 million being recognized in accumulated other comprehensive income with no adjustment for deferred taxes as Customers currently does not have a tax strategy in place capable of generating sufficient capital gains to utilize any capital losses resulting from the Religare investment. At December 31, 2017 and 2016, Customers Bank had pledged investment securities aggregating $16.9 million and $231.3 million fair value, respectively, as collateral against its borrowings primarily with the FHLB and an unused line of credit with another financial institution. These counterparties do not have the ability to sell or repledge these securities.

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