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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2012
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) |
September 30, 2012 |  |  |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities debt securities |  | $ | 313,675 |  | $ | 3,322 |  | $ | — |  | $ | 316,997 |
States and political subdivisions debt securities |  | 159,913 |  | 3,397 |  | (486 | ) | 162,824 |
U.S. Government sponsored entities mortgage-backed securities |  | 945,751 |  | 22,163 |  | (215 | ) | 967,699 |
Corporate securities |  | 49,069 |  | 2,060 |  | — |  | 51,129 |
Other |  | 849 |  | 48 |  | — |  | 897 |
Total |  | $ | 1,469,257 |  | $ | 30,990 |  | $ | (701 | ) | $ | 1,499,546 |
Held to Maturity |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities mortgage-backed securities |  | $ | 163,733 |  | $ | 1,279 |  | $ | — |  | $ | 165,012 |
December 31, 2011 |  |  |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities debt securities |  | $ | 370,184 |  | $ | 2,993 |  | $ | — |  | $ | 373,177 |
States and political subdivisions debt securities |  | 12,265 |  | 729 |  | — |  | 12,994 |
U.S. Government sponsored entities mortgage-backed securities |  | 1,077,146 |  | 20,981 |  | (825 | ) | 1,097,302 |
Corporate securities |  | 8,403 |  | 148 |  | — |  | 8,551 |
Other |  | 985 |  | — |  | (15 | ) | 970 |
Total |  | $ | 1,468,983 |  | $ | 24,851 |  | $ | (840 | ) | $ | 1,492,994 |
Held to Maturity |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities mortgage-backed securities |  | $ | 931 |  | $ | 45 |  | $ | — |  | $ | 976
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity |
|  | September 30, 2012 |
|  | Amortized Cost |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Available for Sale |  |  |  |  |
Due in one year or less |  | $ | 185,755 |  | $ | 186,405 |
Due after one year through five years |  | 156,724 |  | 160,820 |
Due after five years through ten years |  | 54,947 |  | 56,418 |
Due after ten years |  | 125,231 |  | 127,307 |
Mortage-backed securities |  | 945,751 |  | 967,699 |
Other |  | 849 |  | 897 |
Total |  | $ | 1,469,257 |  | $ | 1,499,546 |
Held to Maturity |  |  |  |  |
Mortage-backed securities |  | $ | 163,733 |  | $ | 165,012
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) |
At September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions debt securities |  | $ | 48,262 |  | $ | (486 | ) | $ | — |  | $ | — |  | $ | 48,262 |  | $ | (486 | )
U.S. Government sponsored entities mortgage-backed securities |  | 90,746 |  | (215 | ) | — |  | — |  | 90,746 |  | (215 | )
Total temporarily impaired securities |  | $ | 139,008 |  | $ | (701 | ) | $ | — |  | $ | — |  | $ | 139,008 |  | $ | (701 | )
At December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities mortgage-backed securities |  | $ | 144,520 |  | $ | (825 | ) | $ | — |  | $ | — |  | $ | 144,520 |  | $ | (825 | )
Other |  | 970 |  | (15 | ) | — |  | — |  | 970 |  | (15 | )
Total temporarily impaired securities |  | $ | 145,490 |  | $ | (840 | ) | $ | — |  | $ | — |  | $ | 145,490 |  | $ | (840 | )

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