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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2014
INVESTMENT SECURITIES. |
Summary of available for sale and held to maturity investment securities |
|  |  |  | Gross |  | Gross |  | Estimated |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
|  | (Dollars in thousands) |
2014 |  |  |  |  |  |  |  |  |
Held to Maturity: |  |  |  |  |  |  |  |  |
Mortgage-backed securities - U.S. Government sponsored entities |  | $ | 238,287 |  | $ | 196 |  | $ | (2,886 | ) | $ | 235,597 |
Available for Sale: |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 191,280 |  | $ | 2,054 |  | $ | (1,689 | ) | $ | 191,645 |
Corporate securities |  | 99,237 |  | 1,492 |  | (125 | ) | 100,604 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities |  | 744,527 |  | 11,064 |  | (4,033 | ) | 751,558 |
Non-agency collateralized mortgage obligations |  | 180,905 |  | 4,456 |  | (1,027 | ) | 184,334 |
Other |  | 757 |  | 120 |  | — |  | 877 |
Total |  | $ | 1,216,706 |  | $ | 19,186 |  | $ | (6,874 | ) | $ | 1,229,018 |
2013 |  |  |  |  |  |  |  |  |
Held to Maturity: |  |  |  |  |  |  |  |  |
Mortgage-backed securities - U.S. Government sponsored entities |  | $ | 252,047 |  | $ | — |  | $ | (13,342 | ) | $ | 238,705 |
Available for Sale: |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 191,158 |  | $ | 305 |  | $ | (12,106 | ) | $ | 179,357 |
Corporate securities |  | 157,337 |  | 1,878 |  | (1,120 | ) | 158,095 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities |  | 936,144 |  | 7,085 |  | (15,603 | ) | 927,626 |
Non-agency collateralized mortgage obligations |  | 147,902 |  | 81 |  | (5,937 | ) | 142,046 |
Other |  | 755 |  | 120 |  | — |  | 875 |
Total |  | $ | 1,433,296 |  | $ | 9,469 |  | $ | (34,766 | ) | $ | 1,407,999 |
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity |
|  | December 31, 2014 |
|  | Amortized Cost |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Held to Maturity |  |  |  |  |
Mortgage-backed securities |  | $ | 238,287 |  | $ | 235,597 |
Available for Sale |  |  |  |  |
Due in one year or less |  | $ | 3,851 |  | $ | 3,847 |
Due after one year through five years |  | 56,846 |  | 57,987 |
Due after five years through ten years |  | 112,838 |  | 113,184 |
Due after ten years |  | 116,982 |  | 117,231 |
Mortgage-backed securities |  | 925,432 |  | 935,892 |
Other |  | 757 |  | 877 |
Total |  | $ | 1,216,706 |  | $ | 1,229,018 |
Schedule of investment securities in an unrealized loss position |
|  | Less than 12 months |  | 12 months or longer |  | Total |
|  |  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized |
Description of Securities |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |
|  | (Dollars in thousands) |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 23,591 |  | $ | (145 | ) | $ | 68,622 |  | $ | (1,544 | ) | $ | 92,213 |  | $ | (1,689 | )
Corporate securities |  | 23,938 |  | (125 | ) | — |  | — |  | 23,938 |  | (125 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities |  | 119,210 |  | (521 | ) | 403,926 |  | (6,398 | ) | 523,136 |  | (6,919 | )
Non-agency collateralized mortgage obligations |  | 20,857 |  | (100 | ) | 47,539 |  | (927 | ) | 68,396 |  | (1,027 | )
Total temporarily impaired securities |  | $ | 187,596 |  | $ | (891 | ) | $ | 520,087 |  | $ | (8,869 | ) | $ | 707,683 |  | $ | (9,760 | )
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 137,176 |  | $ | (8,985 | ) | $ | 32,747 |  | $ | (3,121 | ) | $ | 169,923 |  | $ | (12,106 | )
Corporate securities |  | 75,368 |  | (1,120 | ) | — |  | — |  | 75,368 |  | (1,120 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities |  | 909,585 |  | (28,386 | ) | 4,848 |  | (559 | ) | 914,433 |  | (28,945 | )
Non-agency collateralized mortgage obligations |  | 129,991 |  | (5,937 | ) | — |  | — |  | 129,991 |  | (5,937 | )
Total temporarily impaired securities |  | $ | 1,252,120 |  | $ | (44,428 | ) | $ | 37,595 |  | $ | (3,680 | ) | $ | 1,289,715 |  | $ | (48,108 | )

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