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Securities Available-for-Sale | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
SECURITIES AVAILABLE-FOR-SALE | SECURITIES AVAILABLE-FOR-SALE The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:
| December 31, 2017 |  | December 31, 2016
(dollars in thousands) | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury securities | $ | 19,943 |  |  | $ | — |  |  | $ | (154 | ) |  | $ | 19,789 |  |  | $ | 24,891 |  |  | $ | 47 |  |  | $ | (127 | ) |  | $ | 24,811 |
Obligations of U.S. government corporations and agencies | 162,045 |  |  | 341 |  |  | (193 | ) |  | 162,193 |  |  | 230,989 |  |  | 1,573 |  |  | (383 | ) |  | 232,179 |
Collateralized mortgage obligations of U.S. government corporations and agencies | 109,916 |  |  | 93 |  |  | (1,321 | ) |  | 108,688 |  |  | 130,046 |  |  | 465 |  |  | (734 | ) |  | 129,777 |
Residential mortgage-backed securities of U.S. government corporations and agencies | 32,388 |  |  | 679 |  |  | (213 | ) |  | 32,854 |  |  | 36,606 |  |  | 984 |  |  | (232 | ) |  | 37,358 |
Commercial mortgage-backed securities of U.S. government corporations and agencies(1) | 244,018 |  |  | 247 |  |  | (2,044 | ) |  | 242,221 |  |  | 127,311 |  |  | 243 |  |  | (1,950 | ) |  | 125,604 |
Obligations of states and political subdivisions | 123,159 |  |  | 4,285 |  |  | (42 | ) |  | 127,402 |  |  | 128,783 |  |  | 3,772 |  |  | (46 | ) |  | 132,509 |
Debt Securities | 691,469 |  |  | 5,645 |  |  | (3,967 | ) |  | 693,147 |  |  | 678,626 |  |  | 7,084 |  |  | (3,472 | ) |  | 682,238 |
Marketable equity securities | 3,815 |  |  | 1,330 |  |  | (1 | ) |  | 5,144 |  |  | 7,579 |  |  | 3,670 |  |  | — |  |  | 11,249 |
Total | $ | 695,284 |  |  | $ | 6,975 |  |  | $ | (3,968 | ) |  | $ | 698,291 |  |  | $ | 686,205 |  |  | $ | 10,754 |  |  | $ | (3,472 | ) |  | $ | 693,487 |
(1)Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017. The following table shows the composition of gross and net realized gains and losses for the periods presented:
| Years ended December 31,
(dollars in thousands) | 2017 |  |  | 2016 |  |  | 2015 |
Gross realized gains | $ | 3,986 |  |  | $ | — |  |  | $ | — |
Gross realized losses | (986 | ) |  | — |  |  | (34 | )
Net Realized (Losses) Gains | $ | 3,000 |  |  | $ | — |  |  | $ | (34 | )
The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:
| December 31, 2017
| Less Than 12 Months |  | 12 Months or More |  |  |  | Total
(dollars in thousands) | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury securities | 3 |  |  | $ | 19,789 |  |  | $ | (154 | ) |  | — |  |  | $ | — |  |  | $ | — |  |  | 3 |  |  | $ | 19,789 |  |  | $ | (154 | )
Obligations of U.S. government corporations and agencies | 9 |  |  | 63,635 |  |  | (144 | ) |  | 1 |  |  | 10,017 |  |  | (49 | ) |  | 10 |  |  | 73,652 |  |  | (193 | )
Collateralized mortgage obligations of U.S. government corporations and agencies | 7 |  |  | 47,465 |  |  | (248 | ) |  | 7 |  |  | 45,809 |  |  | (1,073 | ) |  | 14 |  |  | 93,274 |  |  | (1,321 | )
Residential mortgage-backed securities of U.S. government corporations and agencies | 1 |  |  | 2,333 |  |  | (10 | ) |  | 2 |  |  | 8,638 |  |  | (203 | ) |  | 3 |  |  | 10,971 |  |  | (213 | )
Commercial mortgage-backed securities of U.S. government corporations and agencies | 14 |  |  | 128,300 |  |  | (775 | ) |  | 5 |  |  | 48,746 |  |  | (1,269 | ) |  | 19 |  |  | 177,046 |  |  | (2,044 | )
Obligations of states and political subdivisions | 2 |  |  | 10,330 |  |  | (42 | ) |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 10,330 |  |  | (42 | )
Debt Securities | 36 |  |  | 271,852 |  |  | (1,373 | ) |  | 15 |  |  | 113,210 |  |  | (2,594 | ) |  | 51 |  |  | 385,062 |  |  | (3,967 | )
Marketable equity securities | 1 |  |  | 70 |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 70 |  |  | (1 | )
Total Temporarily Impaired Securities | 37 |  |  | $ | 271,922 |  |  | $ | (1,374 | ) |  | 15 |  |  | $ | 113,210 |  |  | $ | (2,594 | ) |  | 52 |  |  | $ | 385,132 |  |  | $ | (3,968 | )
| December 31, 2016
| Less Than 12 Months |  | 12 Months or More |  |  |  | Total
(dollars in thousands) | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury securities | 1 |  |  | $ | 9,811 |  |  | $ | (127 | ) |  | — |  |  | $ | — |  |  | $ | — |  |  | 1 |  |  | $ | 9,811 |  |  | $ | (127 | )
Obligations of U.S. government corporations and agencies | 7 |  |  | 62,483 |  |  | (383 | ) |  | — |  |  | — |  |  | — |  |  | 7 |  |  | 62,483 |  |  | (383 | )
Collateralized mortgage obligations of U.S. government corporations and agencies | 10 |  |  | 83,031 |  |  | (734 | ) |  | — |  |  | — |  |  | — |  |  | 10 |  |  | 83,031 |  |  | (734 | )
Residential mortgage-backed securities of U.S. government corporations and agencies | 2 |  |  | 10,022 |  |  | (232 | ) |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 10,022 |  |  | (232 | )
Commercial mortgage-backed securities of U.S. government corporations and agencies | 10 |  |  | 96,576 |  |  | (1,950 | ) |  | — |  |  | — |  |  | — |  |  | 10 |  |  | 96,576 |  |  | (1,950 | )
Obligations of states and political subdivisions | 1 |  |  | 5,577 |  |  | (46 | ) |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 5,577 |  |  | (46 | )
Debt Securities | 31 |  |  | 267,500 |  |  | (3,472 | ) |  | — |  |  | — |  |  | — |  |  | 31 |  |  | 267,500 |  |  | (3,472 | )
Marketable equity securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Temporarily Impaired Securities | 31 |  |  | $ | 267,500 |  |  | $ | (3,472 | ) |  | — |  |  | $ | — |  |  | $ | — |  |  | 31 |  |  | $ | 267,500 |  |  | $ | (3,472 | )
We do not believe any individual unrealized loss as of December 31, 2017 represents an other than temporary impairment, or OTTI. As of December 31, 2017, the unrealized losses on 51 debt securities were primarily attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. There was one marketable equity security with an unrealized loss at December 31, 2017 and no marketable equity securities at an unrealized loss at December 31, 2016. We do not intend to sell and it is more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost. The following table displays net unrealized gains and losses, net of tax, on securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented:
| December 31, 2017 |  | December 31, 2016
(dollars in thousands) | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Net Unrealized Gains (Losses) |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Net Unrealized Gains (Losses) |
Total unrealized gains (losses) on securities available for sale | $ | 6,975 |  |  | $ | (3,968 | ) |  | $ | 3,007 |  |  | $ | 10,754 |  |  | $ | (3,472 | ) |  | $ | 7,282 |
Income tax (expense) benefit | (2,450 | ) |  | 1,394 |  |  | (1,056 | ) |  | (3,776 | ) |  | 1,219 |  |  | (2,557 | )
Net unrealized gains (losses), net of tax included in accumulated other comprehensive income(loss) | $ | 4,525 |  |  | $ | (2,574 | ) |  | $ | 1,951 |  |  | $ | 6,978 |  |  | $ | (2,253 | ) |  | $ | 4,725 |
The amortized cost and fair value of securities available-for-sale at December 31, 2017 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
| December 31, 2017
(dollars in thousands) | Amortized Cost |  |  | Fair Value |
Due in one year or less | $ | 58,501 |  |  | $ | 58,438 |
Due after one year through five years | 141,646 |  |  | 142,859 |
Due after five years through ten years | 70,584 |  |  | 72,132 |
Due after ten years | 34,416 |  |  | 35,955 |
| 305,147 |  |  | 309,384 |
Collateralized mortgage obligations of U.S. government corporations and agencies | 109,916 |  |  | 108,688 |
Residential mortgage-backed securities of U.S. government corporations and agencies | 32,388 |  |  | 32,854 |
Commercial mortgage-backed securities of U.S. government corporations and agencies | 244,018 |  |  | 242,221 |
Debt Securities | 691,469 |  |  | 693,147 |
Marketable equity securities | 3,815 |  |  | 5,144 |
Total | $ | 695,284 |  |  | $ | 698,291 |
At December 31, 2017 and 2016, securities with carrying values of $249 million and $342 million were pledged for various regulatory and legal requirements.

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