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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Equity securities gains and losses [Table Text Block] | The following table represents a summary of the gains and losses that relates to equity securities for the periods indicated:
| Years Ended December 31
| 2018 |  | 2017 |  | 2016
Net losses recognized during the period on equity securities | $ | (1,225 | ) |  | n/a |  | n/a
Less: net gains recognized during the period on equity securities sold during the period | 874 |  |  | n/a |  | n/a
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date | $ | (2,099 | ) |  | n/a |  | n/a
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, 2018 |  | December 31, 2017
| 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 | $ | 32,477 |  | $ | — |  | $ | (439 | ) | $ | 32,038 |  |  | $ | 35,475 |  | $ | 86 |  | $ | (131 | ) | $ | 35,430 |
Agency mortgage-backed securities | 222,491 |  | 1,020 |  | (3,406 | ) | 220,105 |  |  | 214,934 |  | 1,897 |  | (1,067 | ) | 215,764 |
Agency collateralized mortgage obligations | 138,149 |  | 197 |  | (3,435 | ) | 134,911 |  |  | 124,098 |  | 78 |  | (2,164 | ) | 122,012 |
State, county, and municipal securities | 1,719 |  | 16 |  | — |  | 1,735 |  |  | 2,237 |  | 37 |  | — |  | 2,274 |
Single issuer trust preferred securities issued by banks | 717 |  | — |  | (10 | ) | 707 |  |  | 2,012 |  | 4 |  | — |  | 2,016 |
Pooled trust preferred securities issued by banks and insurers | 1,678 |  | — |  | (349 | ) | 1,329 |  |  | 2,179 |  | — |  | (539 | ) | 1,640 |
Small business administration pooled securities | 53,317 |  | — |  | (1,390 | ) | 51,927 |  |  | 47,852 |  | 44 |  | (118 | ) | 47,778 |
Equity securities | — |  | — |  | — |  | — |  |  | 19,432 |  | 1,594 |  | (442 | ) | 20,584 |
Total available for sale securities | 450,548 |  | 1,233 |  | (9,029 | ) | 442,752 |  |  | 448,219 |  | 3,740 |  | (4,461 | ) | 447,498 |
Held to maturity securities |  |  |  |  |  |  |  |  |
U.S. treasury securities | 1,004 |  | 11 |  | — |  | 1,015 |  |  | 1,006 |  | 29 |  | — |  | 1,035 |
Agency mortgage-backed securities | 252,484 |  | 1,548 |  | (3,104 | ) | 250,928 |  |  | 204,768 |  | 1,791 |  | (736 | ) | 205,823 |
Agency collateralized mortgage obligations | 332,775 |  | 869 |  | (6,920 | ) | 326,724 |  |  | 262,998 |  | 397 |  | (4,987 | ) | 258,408 |
Single issuer trust preferred securities issued by banks | 1,500 |  | — |  | (10 | ) | 1,490 |  |  | 1,500 |  | 29 |  | — |  | 1,529 |
Small business administration pooled securities | 23,727 |  | 105 |  | (349 | ) | 23,483 |  |  | 27,416 |  | 183 |  | (200 | ) | 27,399 |
Total held to maturity securities | 611,490 |  | 2,533 |  | (10,383 | ) | 603,640 |  |  | 497,688 |  | 2,429 |  | (5,923 | ) | 494,194 |
Total | $ | 1,062,038 |  | $ | 3,766 |  | $ | (19,412 | ) | $ | 1,046,392 |  |  | $ | 945,907 |  | $ | 6,169 |  | $ | (10,384 | ) | $ | 941,692 |
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, 2018 is presented below:
| Due in one year or less |  | Due after one year to five years |  | Due after five to ten years |  | Due after ten years |  | Total
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (Dollars in thousands)
Available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | — |  |  | $ | — |  |  | $ | 20,010 |  |  | $ | 19,903 |  |  | $ | 12,467 |  |  | $ | 12,135 |  |  | $ | — |  |  | $ | — |  |  | $ | 32,477 |  |  | $ | 32,038 |
Agency mortgage-backed securities | 89 |  |  | 90 |  |  | 52,452 |  |  | 51,761 |  |  | 89,408 |  |  | 88,402 |  |  | 80,542 |  |  | 79,852 |  |  | 222,491 |  |  | 220,105 |
Agency collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 138,149 |  |  | 134,911 |  |  | 138,149 |  |  | 134,911 |
State, county, and municipal securities | — |  |  | — |  |  | 770 |  |  | 771 |  |  | 949 |  |  | 964 |  |  | — |  |  | — |  |  | 1,719 |  |  | 1,735 |
Single issuer trust preferred securities issued by banks | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 717 |  |  | 707 |  |  | 717 |  |  | 707 |
Pooled trust preferred securities issued by banks and insurers | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,678 |  |  | 1,329 |  |  | 1,678 |  |  | 1,329 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 53,317 |  |  | 51,927 |  |  | 53,317 |  |  | 51,927 |
Total available for sale securities | $ | 89 |  |  | $ | 90 |  |  | $ | 73,232 |  |  | $ | 72,435 |  |  | $ | 102,824 |  |  | $ | 101,501 |  |  | $ | 274,403 |  |  | $ | 268,726 |  |  | $ | 450,548 |  |  | $ | 442,752 |
Held to maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | — |  |  | $ | — |  |  | $ | 1,004 |  |  | $ | 1,015 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,004 |  |  | $ | 1,015 |
Agency mortgage-backed securities | — |  |  | — |  |  | 12,098 |  |  | 11,966 |  |  | 35,703 |  |  | 35,310 |  |  | 204,683 |  |  | 203,652 |  |  | 252,484 |  |  | 250,928 |
Agency collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 735 |  |  | 732 |  |  | 332,040 |  |  | 325,992 |  |  | 332,775 |  |  | 326,724 |
State, county, and municipal securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Single issuer trust preferred securities issued by banks | — |  |  | — |  |  | — |  |  | — |  |  | 1,500 |  |  | 1,490 |  |  | — |  |  | — |  |  | 1,500 |  |  | 1,490 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 23,727 |  |  | 23,483 |  |  | 23,727 |  |  | 23,483 |
Total held to maturity securities | $ | — |  |  | $ | — |  |  | $ | 13,102 |  |  | $ | 12,981 |  |  | $ | 37,938 |  |  | $ | 37,532 |  |  | $ | 560,450 |  |  | $ | 553,127 |  |  | $ | 611,490 |  |  | $ | 603,640 |
Schedule of Gross Unrealized Losses and Fair Value of Investments |
|  |  | December 31, 2018
|  |  | 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 | 3 |  |  | $ | 9,960 |  |  | $ | (43 | ) |  | $ | 22,078 |  |  | $ | (396 | ) |  | $ | 32,038 |  |  | $ | (439 | )
Agency mortgage-backed securities | 144 |  |  | 104,616 |  |  | (1,363 | ) |  | 222,850 |  |  | (5,147 | ) |  | 327,466 |  |  | (6,510 | )
Agency collateralized mortgage obligations | 48 |  |  | 57,871 |  |  | (398 | ) |  | 279,229 |  |  | (9,957 | ) |  | 337,100 |  |  | (10,355 | )
Single issuer trust preferred securities issued by banks and insurers | 2 |  |  | 2,197 |  |  | (20 | ) |  | — |  |  | — |  |  | 2,197 |  |  | (20 | )
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,329 |  |  | (349 | ) |  | 1,329 |  |  | (349 | )
Small business administration pooled securities | 7 |  |  | 28,257 |  |  | (662 | ) |  | 40,621 |  |  | (1,077 | ) |  | 68,878 |  |  | (1,739 | )
Total temporarily impaired securities | 205 |  |  | $ | 202,901 |  |  | $ | (2,486 | ) |  | $ | 566,107 |  |  | $ | (16,926 | ) |  | $ | 769,008 |  |  | $ | (19,412 | )
|  |  | 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 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -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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