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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Summary of available for sale and held to maturity investment securities | A summary of our investment securities portfolio as of December 31, 2016 and 2015 is as follows:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated 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 | $ | 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 | $ | 1,246,728 |  |  | $ | 9,784 |  |  | $ | (12,665 | ) |  | $ | 1,243,847 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (Dollars in thousands)
December 31, 2015 |  |  |  |  |  |  |
Held-to-Maturity: |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | $ | 152,315 |  |  | $ | 123 |  |  | $ | (2,915 | ) |  | $ | 149,523 |
Commercial-U.S. Government sponsored entities | 95,602 |  |  | — |  |  | (989 | ) |  | 94,613 |
Total | $ | 247,917 |  |  | $ | 123 |  |  | $ | (3,904 | ) |  | $ | 244,136 |
Available-for-Sale: |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
States and political subdivisions | $ | 187,552 |  |  | $ | 3,819 |  |  | $ | (898 | ) |  | $ | 190,473 |
Corporate securities | 107,721 |  |  | 1,077 |  |  | (227 | ) |  | 108,571 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 771,657 |  |  | 5,885 |  |  | (5,633 | ) |  | 771,909 |
Residential-Non-government sponsored entities | 64,286 |  |  | 733 |  |  | (987 | ) |  | 64,032 |
Commercial-Non-government sponsored entities | 135,439 |  |  | 2,033 |  |  | (1,118 | ) |  | 136,354 |
Other | 848 |  |  | 68 |  |  | — |  |  | 916 |
Total | $ | 1,267,503 |  |  | $ | 13,615 |  |  | $ | (8,863 | ) |  | $ | 1,272,255 |
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, 2016 by contractual maturity are shown below. Actual maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
| December 31, 2016
| Amortized Cost |  | Estimated Fair Value
| (Dollars in thousands)
Held-to-Maturity: |  |  |
Mortgage-backed securities | $ | 217,668 |  |  | $ | 214,366 |
Available-for-Sale: |  |  |
Due in one year or less | $ | 6,701 |  |  | $ | 6,699 |
Due after one year through five years | 132,559 |  |  | 133,374 |
Due after five years through ten years | 67,541 |  |  | 67,664 |
Due after ten years | 76,631 |  |  | 76,693 |
Mortgage-backed securities | 962,732 |  |  | 958,757 |
Other | 564 |  |  | 660 |
Total | $ | 1,246,728 |  |  | $ | 1,243,847 |
Schedule of investment securities in an unrealized loss position | Provided below is a summary of investment securities which were in an unrealized loss position at December 31, 2016 and 2015:
| Less Than 12 Months |  | 12 Months or Longer |  | Total
Description of Securities | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated 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 | )
| Less Than 12 Months |  | 12 Months or Longer |  | Total
Description of Securities | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
| (Dollars in thousands)
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions | $ | 30,481 |  |  | $ | (532 | ) |  | $ | 12,576 |  |  | $ | (366 | ) |  | $ | 43,057 |  |  | $ | (898 | )
Corporate securities | 32,977 |  |  | (227 | ) |  | — |  |  | — |  |  | 32,977 |  |  | (227 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential-U.S. Government sponsored entities | 507,525 |  |  | (6,241 | ) |  | 88,271 |  |  | (2,307 | ) |  | 595,796 |  |  | (8,548 | )
Residential-Non-government sponsored entities | 37,975 |  |  | (987 | ) |  | — |  |  | — |  |  | 37,975 |  |  | (987 | )
Commercial-U.S. Government sponsored entities | 94,613 |  |  | (989 | ) |  | — |  |  | — |  |  | 94,613 |  |  | (989 | )
Commercial-Non-government sponsored entities | 62,555 |  |  | (961 | ) |  | 4,644 |  |  | (157 | ) |  | 67,199 |  |  | (1,118 | )
Total temporarily impaired securities | $ | 766,126 |  |  | $ | (9,937 | ) |  | $ | 105,491 |  |  | $ | (2,830 | ) |  | $ | 871,617 |  |  | $ | (12,767 | )

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