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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Summary of available for sale and held to maturity investment securities |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (Dollars in thousands)
December 31, 2016 |  |  |  |  |  |  |
Held-to-Maturity: |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | $ | 124,082 |  |  | $ | 92 |  |  | $ | (2,474 | ) |  | $ | 121,700 |
Commercial-U.S. Government sponsored entities | 93,586 |  |  | — |  |  | (920 | ) |  | 92,666 |
Total held-to-maturity investment securities | $ | 217,668 |  |  | $ | 92 |  |  | $ | (3,394 | ) |  | $ | 214,366 |
Available-for-Sale: |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
States and political subdivisions | $ | 184,836 |  |  | $ | 2,002 |  |  | $ | (1,797 | ) |  | $ | 185,041 |
Corporate securities | 98,596 |  |  | 974 |  |  | (181 | ) |  | 99,389 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 775,803 |  |  | 3,698 |  |  | (9,515 | ) |  | 769,986 |
Residential-Non-government sponsored entities | 51,681 |  |  | 627 |  |  | (761 | ) |  | 51,547 |
Commercial-Non-government sponsored entities | 135,248 |  |  | 2,387 |  |  | (411 | ) |  | 137,224 |
Other | 564 |  |  | 96 |  |  | — |  |  | 660 |
Total available-for-sale investment securities | $ | 1,246,728 |  |  | $ | 9,784 |  |  | $ | (12,665 | ) |  | $ | 1,243,847 |
A summary of our investment securities portfolio as of December 31, 2017 and 2016 is as follows:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (Dollars in thousands)
December 31, 2017 |  |  |  |  |  |  |
Held-to-Maturity: |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | $ | 100,279 |  |  | $ | 106 |  |  | $ | (2,222 | ) |  | $ | 98,163 |
Commercial-U.S. Government sponsored entities | 91,474 |  |  | — |  |  | (436 | ) |  | 91,038 |
Total held-to-maturity investment securities | $ | 191,753 |  |  | $ | 106 |  |  | $ | (2,658 | ) |  | $ | 189,201 |
Available-for-Sale: |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
States and political subdivisions | $ | 178,459 |  |  | $ | 2,041 |  |  | $ | (719 | ) |  | $ | 179,781 |
Corporate securities | 73,772 |  |  | 582 |  |  | (76 | ) |  | 74,278 |
U.S. Treasury obligations and direct obligations of U.S Government agencies | 25,519 |  |  | 60 |  |  | (69 | ) |  | 25,510 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 808,242 |  |  | 2,230 |  |  | (9,789 | ) |  | 800,683 |
Residential-Non-government sponsored entities | 45,679 |  |  | 1,084 |  |  | — |  |  | 46,763 |
Commercial-U.S. Government agencies and sponsored entities | 40,012 |  |  | — |  |  | (287 | ) |  | 39,725 |
Commercial-Non-government sponsored entities | 135,058 |  |  | 2,461 |  |  | (193 | ) |  | 137,326 |
Other | 686 |  |  | 139 |  |  | — |  |  | 825 |
Total available-for-sale investment securities | $ | 1,307,427 |  |  | $ | 8,597 |  |  | $ | (11,133 | ) |  | $ | 1,304,891 |
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity | The amortized cost and estimated fair value of our investment securities at December 31, 2017 by contractual maturity are shown below. Actual maturities may differ from contractual maturities as issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
| December 31, 2017
| Amortized Cost |  | Fair Value
| (Dollars in thousands)
Held-to-Maturity: |  |  |
Mortgage-backed securities: |  |  |
Residential-U.S. Government-sponsored entities | $ | 100,279 |  |  | $ | 98,163 |
Commercial-U.S. Government-sponsored entities | 91,474 |  |  | 91,038 |
Total held-to-maturity investment securities | $ | 191,753 |  |  | $ | 189,201 |
Available-for-Sale: |  |  |
Due in one year or less | $ | 8,796 |  |  | $ | 8,799 |
Due after one year through five years | 165,356 |  |  | 166,447 |
Due after five years through ten years | 40,762 |  |  | 41,166 |
Due after ten years | 62,836 |  |  | 63,157 |
Mortgage-backed securities |  |  |
Residential-U.S. Government-sponsored entities | 808,242 |  |  | 800,683 |
Residential-Non-government agencies | 45,679 |  |  | 46,763 |
Commercial-U.S. Government agencies and sponsored entities | 40,012 |  |  | 39,725 |
Commercial-Non-government agencies | 135,058 |  |  | 137,326 |
Other | 686 |  |  | 825 |
Total available-for-sale investment securities | $ | 1,307,427 |  |  | $ | 1,304,891 |
Schedule of investment securities in an unrealized loss position | The following table summarizes securities which were in an unrealized or unrecognized loss position at December 31, 2017 and 2016, aggregated by major security type and length of time in a continuous unrealized or unrecognized loss position:
| Less Than 12 Months |  | 12 Months or Longer |  | Total
Description of Securities | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions | $ | 53,811 |  |  | $ | (305 | ) |  | $ | 15,403 |  |  | $ | (414 | ) |  | $ | 69,214 |  |  | $ | (719 | )
Corporate securities | — |  |  | — |  |  | 5,307 |  |  | (76 | ) |  | 5,307 |  |  | (76 | )
U.S. Treasury obligations and direct obligations of U.S Government agencies | 10,740 |  |  | (69 | ) |  | — |  |  | — |  |  | 10,740 |  |  | (69 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 335,883 |  |  | (3,372 | ) |  | 340,219 |  |  | (8,639 | ) |  | 676,102 |  |  | (12,011 | )
Commercial-U.S. Government sponsored entities | 130,763 |  |  | (723 | ) |  | — |  |  | — |  |  | 130,763 |  |  | (723 | )
Commercial-Non-government sponsored entities | 28,490 |  |  | (193 | ) |  | — |  |  | — |  |  | 28,490 |  |  | (193 | )
Total temporarily impaired securities | $ | 559,687 |  |  | $ | (4,662 | ) |  | $ | 360,929 |  |  | $ | (9,129 | ) |  | $ | 920,616 |  |  | $ | (13,791 | )
| Less Than 12 Months |  | 12 Months or Longer |  | Total
Description of Securities | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions | $ | 85,288 |  |  | $ | (1,797 | ) |  | $ | — |  |  | $ | — |  |  | $ | 85,288 |  |  | $ | (1,797 | )
Corporate securities | 20,357 |  |  | (181 | ) |  | — |  |  | — |  |  | 20,357 |  |  | (181 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 648,923 |  |  | (11,766 | ) |  | 3,978 |  |  | (223 | ) |  | 652,901 |  |  | (11,989 | )
Residential-Non-government sponsored entities | 30,596 |  |  | (761 | ) |  | — |  |  | — |  |  | 30,596 |  |  | (761 | )
Commercial-U.S. Government sponsored entities | 92,666 |  |  | (920 | ) |  | — |  |  | — |  |  | 92,666 |  |  | (920 | )
Commercial-Non-government sponsored entities | 52,880 |  |  | (411 | ) |  | — |  |  | — |  |  | 52,880 |  |  | (411 | )
Total temporarily impaired securities | $ | 930,710 |  |  | $ | (15,836 | ) |  | $ | 3,978 |  |  | $ | (223 | ) |  | $ | 934,688 |  |  | $ | (16,059 | )

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