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Securities | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The following is a summary of securities available for sale as of the dates indicated:
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value
| (in thousands)
June 30, 2019 |  |  |  |  |  |  |
U.S. Treasury securities | $ | 49,728 |  |  | $ | 334 |  |  | $ | — |  |  | $ | 50,062 |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |
Mortgage-backed securities | 400,656 |  |  | 3,013 |  |  | (685 | ) |  | 402,984 |
Collateralized mortgage obligations | 167,312 |  |  | 1,081 |  |  | (580 | ) |  | 167,813 |
Debt securities | 18,961 |  |  | 194 |  |  | (19 | ) |  | 19,136 |
Total U.S. government agency and sponsored agency obligations | 586,929 |  |  | 4,288 |  |  | (1,284 | ) |  | 589,933 |
Total securities available for sale | $ | 636,657 |  |  | $ | 4,622 |  |  | $ | (1,284 | ) |  | $ | 639,995 |
December 31, 2018 |  |  |  |  |  |  |
U.S. Treasury securities | $ | 39,768 |  |  | $ | 69 |  |  | $ | (7 | ) |  | $ | 39,830 |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |
Mortgage-backed securities | 300,957 |  |  | 61 |  |  | (5,984 | ) |  | 295,034 |
Collateralized mortgage obligations | 124,550 |  |  | 74 |  |  | (2,332 | ) |  | 122,292 |
Debt securities | 7,499 |  |  | — |  |  | (97 | ) |  | 7,402 |
Total U.S. government agency and sponsored agency obligations | 433,006 |  |  | 135 |  |  | (8,413 | ) |  | 424,728 |
Municipal bonds-tax exempt | 110,670 |  |  | 197 |  |  | (517 | ) |  | 110,350 |
Total securities available for sale | $ | 583,444 |  |  | $ | 401 |  |  | $ | (8,937 | ) |  | $ | 574,908 |
The amortized cost and estimated fair value of securities as of June 30, 2019, by contractual or expected maturity, are shown below. Collateralized mortgage obligations are included in the table shown below based on their expected maturities. All other securities are included based on their contractual maturities.
| Available for Sale
| Amortized Cost |  | Estimated Fair Value
| (in thousands)
Within one year | $ | 37,753 |  |  | $ | 37,842 |
Over one year through five years | 164,874 |  |  | 165,747 |
Over five years through ten years | 226,806 |  |  | 228,576 |
Over ten years | 207,224 |  |  | 207,830 |
Total | $ | 636,657 |  |  | $ | 639,995 |
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, 2019 and December 31, 2018:
| 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, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and sponsored agency obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | (4 | ) |  | $ | 14,114 |  |  | 3 |  |  | $ | (681 | ) |  | $ | 124,833 |  |  | 61 |  |  | $ | (685 | ) |  | $ | 138,947 |  |  | 64 |
Collateralized mortgage obligations | (18 | ) |  | 7,141 |  |  | 2 |  |  | (562 | ) |  | 62,006 |  |  | 41 |  |  | (580 | ) |  | 69,147 |  |  | 43 |
Debt securities | — |  |  | — |  |  | — |  |  | (19 | ) |  | 4,480 |  |  | 2 |  |  | (19 | ) |  | 4,480 |  |  | 2 |
Total U.S. government agency and sponsored agency obligations | (22 | ) |  | 21,255 |  |  | 5 |  |  | (1,262 | ) |  | 191,319 |  |  | 104 |  |  | (1,284 | ) |  | 212,574 |  |  | 109 |
Total | $ | (22 | ) |  | $ | 21,255 |  |  | 5 |  |  | $ | (1,262 | ) |  | $ | 191,319 |  |  | 104 |  |  | $ | (1,284 | ) |  | $ | 212,574 |  |  | 109 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | (7 | ) |  | $ | 14,797 |  |  | 2 |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | (7 | ) |  | $ | 14,797 |  |  | 2 |
U.S. government agency and sponsored agency obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | (226 | ) |  | $ | 41,527 |  |  | 10 |  |  | $ | (5,758 | ) |  | $ | 244,550 |  |  | 106 |  |  | $ | (5,984 | ) |  | $ | 286,077 |  |  | 116 |
Collateralized mortgage obligations | (59 | ) |  | 13,732 |  |  | 3 |  |  | (2,273 | ) |  | 92,532 |  |  | 49 |  |  | (2,332 | ) |  | 106,264 |  |  | 52 |
Debt securities | — |  |  | — |  |  | — |  |  | (97 | ) |  | 7,402 |  |  | 3 |  |  | (97 | ) |  | 7,402 |  |  | 3 |
Total U.S. government agency and sponsored agency obligations | (285 | ) |  | 55,259 |  |  | 13 |  |  | (8,128 | ) |  | 344,484 |  |  | 158 |  |  | (8,413 | ) |  | 399,743 |  |  | 171 |
Municipal bonds-tax exempt | (29 | ) |  | 8,196 |  |  | 5 |  |  | (488 | ) |  | 65,644 |  |  | 30 |  |  | (517 | ) |  | 73,840 |  |  | 35 |
Total | $ | (321 | ) |  | $ | 78,252 |  |  | 20 |  |  | $ | (8,616 | ) |  | $ | 410,128 |  |  | 188 |  |  | $ | (8,937 | ) |  | $ | 488,380 |  |  | 208 |
All individual securities that have been in a continuous unrealized loss position for 12 months or longer as of June 30, 2019 and December 31, 2018 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, 2019 and December 31, 2018. 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 investments before the recovery of their amortized cost basis. 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, 2019 and December 31, 2018 were not other-than-temporarily impaired, and therefore, no impairment charges as of June 30, 2019 and December 31, 2018 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,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (in thousands)
Gross realized gains on sales of securities | $ | 634 |  |  | $ | 67 |  |  | $ | 1,359 |  |  | $ | 67 |
Gross realized losses on sales of securities | (64 | ) |  | — |  |  | (64 | ) |  | (428 | )
Net realized gains (losses) on sales of securities | $ | 570 |  |  | $ | 67 |  |  | $ | 1,295 |  |  | $ | (361 | )
Proceeds from sales of securities | $ | 44,119 |  |  | $ | 9,366 |  |  | $ | 113,306 |  |  | $ | 31,325 |
In January 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Topic 825). This new guidance, among other provisions, amends accounting related to the classification and measurement of investments in equity securities. We adopted this guidance, as required, in the first quarter of 2018. ASU 2016-01 requires the amounts reported in accumulated other comprehensive income for equity securities that exist as of the date of adoption previously classified as available-for-sale be reclassified to retained earnings. The Company reduced the balance of securities by $529,000 as of January 1, 2018, representing the loss related to our mutual fund equity securities, which resulted in a net reduction of retained earnings of $382,000 and an increase of $147,000 in net deferred tax assets based on the transition requirements of this standard. During the three months ended June 30, 2019 and 2018, there was a $570,000 and $67,000 net gain in earnings resulting from the sale of securities, respectively. A net unrealized gain of $792,000 and $95,000 related to these securities had previously been recorded in accumulated other comprehensive income as of the beginning of the period in 2019 and 2018, respectively. During the six months ended June 30, 2019, there was $1.3 million in net gains in earnings resulting from the sale of securities which had $586,000 in previously recorded unrealized gains in accumulated other comprehensive income. During the six months ended June 30, 2018, there was a $361,000 net loss in earnings resulting from the sale of securities. Additionally, during the six months ended June 30, 2019, we sold all of our tax exempt municipal bonds with a gross realized gain of $634,000. During the three months ended March 31, 2018, we sold all of our mutual fund equity securities with gross realized losses of $957,000. No such securities were held during the six months ended June 30, 2019. Securities available for sale with market values of $30.2 million and $29.9 million as of June 30, 2019 and December 31, 2018, respectively, were pledged to secure public deposits and for other purposes as required or permitted by law.

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