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Securities | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The following is a summary of securities available for sale as of June 30, 2016 and December 31, 2015:
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value
| (in thousands)
June 30, 2016 |  |  |  |  |  |  |
Mortgage-backed securities (1) (2) | $ | 262,223 |  |  | $ | 4,129 |  |  | $ | 77 |  |  | $ | 266,275 |
Collateralized mortgage obligations (1) | 85,678 |  |  | 554 |  |  | 91 |  |  | 86,141 |
U.S. government agency securities | 15,491 |  |  | 53 |  |  | — |  |  | 15,544 |
SBA loan pool securities | 56,553 |  |  | 62 |  |  | 190 |  |  | 56,425 |
Municipal bonds-tax exempt | 160,951 |  |  | 8,475 |  |  | — |  |  | 169,426 |
Municipal bonds-taxable | 13,476 |  |  | 616 |  |  | — |  |  | 14,092 |
Corporate bonds | 5,014 |  |  | — |  |  | 13 |  |  | 5,001 |
U.S. treasury securities | 157 |  |  | 1 |  |  | — |  |  | 158 |
Mutual funds | 22,916 |  |  | 382 |  |  | 85 |  |  | 23,213 |
Total securities available for sale | $ | 622,459 |  |  | $ | 14,272 |  |  | $ | 456 |  |  | $ | 636,275 |
December 31, 2015 |  |  |  |  |  |  |
Mortgage-backed securities (1) (2) | $ | 286,450 |  |  | $ | 392 |  |  | $ | 2,461 |  |  | $ | 284,381 |
Collateralized mortgage obligations (1) | 97,904 |  |  | 79 |  |  | 997 |  |  | 96,986 |
U.S. government agency securities | 48,478 |  |  | — |  |  | 656 |  |  | 47,822 |
SBA loan pool securities | 63,670 |  |  | 7 |  |  | 411 |  |  | 63,266 |
Municipal bonds-tax exempt | 162,101 |  |  | 1,820 |  |  | 19 |  |  | 163,902 |
Municipal bonds-taxable | 13,932 |  |  | 189 |  |  | 88 |  |  | 14,033 |
Corporate bonds | 5,017 |  |  | — |  |  | 24 |  |  | 4,993 |
U.S. treasury securities | 159 |  |  | 1 |  |  | — |  |  | 160 |
Mutual funds | 22,916 |  |  | — |  |  | 163 |  |  | 22,753 |
Total securities available for sale | $ | 700,627 |  |  | $ | 2,488 |  |  | $ | 4,819 |  |  | $ | 698,296 |
(1) | Collateralized by residential mortgages and guaranteed by U.S. government sponsored entities.
(2) | Include securities collateralized by home equity conversion mortgages with total estimated fair value of $55.7 million and $58.6 million as of June 30, 2016 and December 31, 2015, respectively.
The amortized cost and estimated fair value of securities as of June 30, 2016, by contractual or expected maturity, are shown below. Collateralized mortgage obligations are included in the table shown below based on their expected maturities. Mutual funds do not have contractual maturities. However, they are included in the table shown below as over ten years since the Company intends to hold these securities for at least this duration. All other securities are included based on their contractual maturities.
| Available for Sale
| Amortized Cost |  | Estimated Fair Value
| (in thousands)
Within one year | $ | 1 |  |  | $ | 1 |
Over one year through five years | 93,040 |  |  | 93,762 |
Over five years through ten years | 273,361 |  |  | 279,870 |
Over ten years | 256,057 |  |  | 262,642 |
Total | $ | 622,459 |  |  | $ | 636,275 |
Gross unrealized losses on securities available for sale, the estimated fair value of the related securities and the number of securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows as of June 30, 2016 and December 31, 2015:
| Holding Period
| Less Than 12 Months |  | 12 Months or More |  | Total
| Gross Unrealized Loss |  | Estimated Fair Value |  | Number of Securities |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Number of Securities |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Number of Securities
| (in thousands, except number of securities)
June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 43 |  |  | $ | 10,746 |  |  | 4 |  |  | $ | 34 |  |  | $ | 10,912 |  |  | 3 |  |  | $ | 77 |  |  | $ | 21,658 |  |  | 7 |
Collateralized mortgage obligations | 10 |  |  | 12,778 |  |  | 6 |  |  | 81 |  |  | 13,879 |  |  | 7 |  |  | 91 |  |  | 26,657 |  |  | 13 |
SBA loan pool securities | 117 |  |  | 35,639 |  |  | 10 |  |  | 73 |  |  | 14,518 |  |  | 5 |  |  | 190 |  |  | 50,157 |  |  | 15 |
Corporate bonds | — |  |  | — |  |  | — |  |  | 13 |  |  | 5,001 |  |  | 1 |  |  | 13 |  |  | 5,001 |  |  | 1 |
Mutual funds | — |  |  | — |  |  | — |  |  | 85 |  |  | 941 |  |  | 3 |  |  | 85 |  |  | 941 |  |  | 3 |
Total | $ | 170 |  |  | $ | 59,163 |  |  | 20 |  |  | $ | 286 |  |  | $ | 45,251 |  |  | 19 |  |  | $ | 456 |  |  | $ | 104,414 |  |  | 39 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 1,734 |  |  | $ | 193,931 |  |  | 52 |  |  | $ | 727 |  |  | $ | 21,659 |  |  | 9 |  |  | $ | 2,461 |  |  | $ | 215,590 |  |  | 61 |
Collateralized mortgage obligations | 335 |  |  | 48,970 |  |  | 18 |  |  | 662 |  |  | 32,964 |  |  | 13 |  |  | 997 |  |  | 81,934 |  |  | 31 |
U.S. government agency securities | 201 |  |  | 23,289 |  |  | 8 |  |  | 455 |  |  | 24,533 |  |  | 8 |  |  | 656 |  |  | 47,822 |  |  | 16 |
SBA loan pool securities | 161 |  |  | 50,499 |  |  | 12 |  |  | 250 |  |  | 7,036 |  |  | 3 |  |  | 411 |  |  | 57,535 |  |  | 15 |
Municipal bonds-tax exempt | 19 |  |  | 8,922 |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | 19 |  |  | 8,922 |  |  | 6 |
Municipal bonds-taxable | 88 |  |  | 7,106 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 88 |  |  | 7,106 |  |  | 4 |
Corporate binds | 24 |  |  | 4,994 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 24 |  |  | 4,994 |  |  | 1 |
Mutual funds | 66 |  |  | 21,820 |  |  | 3 |  |  | 97 |  |  | 928 |  |  | 3 |  |  | 163 |  |  | 22,748 |  |  | 6 |
Total | $ | 2,628 |  |  | $ | 359,531 |  |  | 104 |  |  | $ | 2,191 |  |  | $ | 87,120 |  |  | 36 |  |  | $ | 4,819 |  |  | $ | 446,651 |  |  | 140 |
All individual securities that have been in a continuous unrealized loss position for 12 months or longer as of June 30, 2016 and December 31, 2015 had investment grade ratings upon purchase. The issuers of these securities have not established any cause for default on these securities and the various rating agencies have reaffirmed these securities’ long-term investment grade status as of June 30, 2016 and December 31, 2015. These securities have fluctuated in value since their purchase dates as market interest rates have fluctuated. The Company does not intend to sell these securities and it is more likely than not that we will not be required to sell the securities before the recovery of their amortized cost basis. In addition, the unrealized losses on municipal and corporate bonds are not considered other-than-temporarily impaired, as the bonds are rated investment grade and there are no credit quality concerns with the issuers. Interest payments have been made as scheduled, and management believes this will continue in the future and that the bonds will be repaid in full as scheduled. Therefore, in management’s opinion, all securities that have been in a continuous unrealized loss position for the past 12 months or longer as of June 30, 2016 and December 31, 2015 were not other-than-temporarily impaired, and therefore, no impairment charges as of June 30, 2016 and December 31, 2015 were warranted. Realized gains and losses on sales of securities and proceeds from sales of securities were as follows for the periods indicated:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in thousands) |  |  |  |
Gross realized gains on sales of securities | $ | — |  |  | $ | 2,067 |  |  | $ | — |  |  | $ | 4,262 |
Gross realized losses on sales of securities | — |  |  | (155 | ) |  | — |  |  | (166 | )
Net realized gains on sales of securities | $ | — |  |  | $ | 1,912 |  |  | $ | — |  |  | $ | 4,096 |
Proceeds from sales of securities | $ | — |  |  | $ | 130,594 |  |  | $ | — |  |  | $ | 307,442 |
There were no sales of securities during the six-month period ended June 30, 2016. For the three months ended June 30, 2015, there was a $1.9 million net gain in earnings resulting from the sale of securities that had previously been recorded as net unrealized gains of $4.1 million in comprehensive income. For the six months ended June 30, 2015, there was a $4.1 million net gain in earnings resulting from the sale of securities that had previously been recorded as net unrealized gains of $1.2 million in comprehensive income. Securities available for sale with market values of $97.6 million and $72.0 million as of June 30, 2016 and December 31, 2015, respectively, were pledged to secure public deposits and for other purposes as required or permitted by law.

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