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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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.
Statement of Proceeds from Sale of Available for Sale Investment Securities | 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 | )
Summary of Investment Securities by Stated Maturity | 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, Aggregated by Investment Category | 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.

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