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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities and Held-to-maturity Securities | The following table presents a summary of the amortized cost, gross unrealized holding gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated:
| December 31, 2017 |  | December 31, 2016
| Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value |  | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
| (Dollars in thousands)
Available for sale securities |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | 35,475 |  | $ | 86 |  | $ | (131 | ) | $ | 35,430 |  |  | $ | 24,006 |  | $ | 238 |  | $ | — |  | $ | 24,244 |
Agency mortgage-backed securities | 214,934 |  | 1,897 |  | (1,067 | ) | 215,764 |  |  | 173,268 |  | 2,852 |  | (736 | ) | 175,384 |
Agency collateralized mortgage obligations | 124,098 |  | 78 |  | (2,164 | ) | 122,012 |  |  | 101,094 |  | 106 |  | (1,332 | ) | 99,868 |
State, county, and municipal securities | 2,237 |  | 37 |  | — |  | 2,274 |  |  | 3,743 |  | 50 |  | — |  | 3,793 |
Single issuer trust preferred securities issued by banks | 2,012 |  | 4 |  | — |  | 2,016 |  |  | 2,311 |  | 3 |  | (3 | ) | 2,311 |
Pooled trust preferred securities issued by banks and insurers | 2,179 |  | — |  | (539 | ) | 1,640 |  |  | 2,200 |  | — |  | (616 | ) | 1,584 |
Small business administration pooled securities | 47,852 |  | 44 |  | (118 | ) | 47,778 |  |  | 37,561 |  | — |  | (372 | ) | 37,189 |
Equity securities | 19,432 |  | 1,594 |  | (442 | ) | 20,584 |  |  | 19,183 |  | 641 |  | (553 | ) | 19,271 |
Total available for sale securities | 448,219 |  | 3,740 |  | (4,461 | ) | 447,498 |  |  | 363,366 |  | 3,890 |  | (3,612 | ) | 363,644 |
Held to maturity securities |  |  |  |  |  |  |  |  |
U.S. treasury securities | 1,006 |  | 29 |  | — |  | 1,035 |  |  | 1,007 |  | 47 |  | — |  | 1,054 |
Agency mortgage-backed securities | 204,768 |  | 1,791 |  | (736 | ) | 205,823 |  |  | 156,088 |  | 2,274 |  | (858 | ) | 157,504 |
Agency collateralized mortgage obligations | 262,998 |  | 397 |  | (4,987 | ) | 258,408 |  |  | 297,445 |  | 1,002 |  | (3,797 | ) | 294,650 |
Single issuer trust preferred securities issued by banks | 1,500 |  | 29 |  | — |  | 1,529 |  |  | 1,500 |  | 44 |  | — |  | 1,544 |
Small business administration pooled securities | 27,416 |  | 183 |  | (200 | ) | 27,399 |  |  | 31,036 |  | 189 |  | (327 | ) | 30,898 |
Total held to maturity securities | 497,688 |  | 2,429 |  | (5,923 | ) | 494,194 |  |  | 487,076 |  | 3,556 |  | (4,982 | ) | 485,650 |
Total | $ | 945,907 |  | $ | 6,169 |  | $ | (10,384 | ) | $ | 941,692 |  |  | $ | 850,442 |  | $ | 7,446 |  | $ | (8,594 | ) | $ | 849,294 |
Schedule of Contractual Maturities of Securities | A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2017 is presented below:
| Available for Sale |  | Held to Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (Dollars in thousands)
Due in one year or less | $ | 3,213 |  |  | $ | 3,215 |  |  | $ | — |  |  | $ | — |
Due after one year to five years | 49,241 |  |  | 49,312 |  |  | 15,636 |  |  | 15,711 |
Due after five to ten years | 107,417 |  |  | 107,402 |  |  | 16,801 |  |  | 17,098 |
Due after ten years | 268,916 |  |  | 266,985 |  |  | 465,251 |  |  | 461,385 |
Total debt securities | 428,787 |  |  | 426,914 |  |  | 497,688 |  |  | 494,194 |
Equity securities | 19,432 |  |  | 20,584 |  |  | — |  |  | — |
Total | $ | 448,219 |  |  | $ | 447,498 |  |  | $ | 497,688 |  |  | $ | 494,194 |
Schedule of Gross Unrealized Losses and Fair Value of Investments |
|  |  | December 31, 2017
|  |  | Less than 12 months |  | 12 months or longer |  | Total
Description of securities | # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  |  | (Dollars in thousands)
U.S. government agency securities | 4 |  |  | $ | 24,343 |  |  | $ | (131 | ) |  | $ | — |  |  | $ | — |  |  | $ | 24,343 |  |  | $ | (131 | )
Agency mortgage-backed securities | 84 |  |  | $ | 235,411 |  |  | $ | (1,493 | ) |  | $ | 14,886 |  |  | $ | (310 | ) |  | $ | 250,297 |  |  | $ | (1,803 | )
Agency collateralized mortgage obligations | 42 |  |  | 178,142 |  |  | (1,579 | ) |  | 159,506 |  |  | (5,572 | ) |  | 337,648 |  |  | (7,151 | )
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,640 |  |  | (539 | ) |  | 1,640 |  |  | (539 | )
Small business administration pooled securities | 4 |  |  | 34,553 |  |  | (223 | ) |  | 9,647 |  |  | (95 | ) |  | 44,200 |  |  | (318 | )
Equity securities | 28 |  |  | 3,290 |  |  | (39 | ) |  | 7,619 |  |  | (403 | ) |  | 10,909 |  |  | (442 | )
Total temporarily impaired securities | 163 |  |  | $ | 475,739 |  |  | $ | (3,465 | ) |  | $ | 193,298 |  |  | $ | (6,919 | ) |  | $ | 669,037 |  |  | $ | (10,384 | )
|  |  | December 31, 2016
|  |  | Less than 12 months |  | 12 months or longer |  | Total
Description of securities | # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  |  | (Dollars in thousands)
Agency mortgage-backed securities | 57 |  |  | $ | 137,949 |  |  | $ | (1,594 | ) |  | $ | — |  |  | $ | — |  |  | $ | 137,949 |  |  | $ | (1,594 | )
Agency collateralized mortgage obligations | 32 |  |  | 243,051 |  |  | (3,140 | ) |  | 47,403 |  |  | (1,989 | ) |  | 290,454 |  |  | (5,129 | )
Single issuer trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,036 |  |  | (3 | ) |  | 1,036 |  |  | (3 | )
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,583 |  |  | (616 | ) |  | 1,583 |  |  | (616 | )
Small business administration pooled securities | 5 |  |  | 59,846 |  |  | (699 | ) |  | — |  |  | — |  |  | 59,846 |  |  | (699 | )
Equity securities | 25 |  |  | 3,625 |  |  | (77 | ) |  | 6,334 |  |  | (476 | ) |  | 9,959 |  |  | (553 | )
Total temporarily impaired securities | 121 |  |  | $ | 444,471 |  |  | $ | (5,510 | ) |  | $ | 56,356 |  |  | $ | (3,084 | ) |  | $ | 500,827 |  |  | $ | (8,594 | )

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- Definition Tabular disclosure of available for sale securities and held to maturity securities reconciliation. + References No definition available. + Details
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- Definition Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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