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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2012
INVESTMENT SECURITIES |
Summary of investment securities portfolio |
|  |  |  | Gross |  | Gross |  | Estimated |
|  | Amortized |  | unrealized |  | unrealized |  | fair |
|  | cost |  | gains |  | losses |  | value |
|  | (Dollars in thousands) |
2012 |  |  |  |  |  |  |  |  |
Held to Maturity: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities mortgage-backed securities |  | $ | 161,848 |  | $ | 695 |  | $ | (15 | ) | $ | 162,528 |
Available for Sale: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities debt securities |  | $ | 278,198 |  | $ | 2,741 |  | $ | — |  | $ | 280,939 |
States and political subdivisions |  | 184,274 |  | 2,831 |  | (1,194 | ) | 185,911 |
U.S. Government sponsored entities mortgage-backed securities |  | 925,018 |  | 17,548 |  | (1,523 | ) | 941,043 |
Corporate securities |  | 125,649 |  | 2,360 |  | (63 | ) | 127,946 |
Other |  | 866 |  | 40 |  | — |  | 906 |
Total |  | $ | 1,514,005 |  | $ | 25,520 |  | $ | (2,780 | ) | $ | 1,536,745 |
2011 |  |  |  |  |  |  |  |  |
Held to Maturity: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities mortgage-backed securities |  | $ | 931 |  | $ | 45 |  | $ | — |  | $ | 976 |
Available for Sale: |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities debt securities |  | $ | 370,184 |  | $ | 2,993 |  | $ | — |  | $ | 373,177 |
States and political subdivisions |  | 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 |
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity |
|  | December 31, 2012 |
|  | Amortized |  | Estimated |
|  | cost |  | fair value |
|  | (Dollars in thousands) |
Held to Maturity |  |  |  |  |
Mortgage-backed securities |  | $ | 161,848 |  | $ | 162,528 |
Available for Sale |  |  |  |  |
Due in one year or less |  | $ | 170,435 |  | $ | 170,933 |
Due after one year through five years |  | 164,101 |  | 168,358 |
Due after five years through ten years |  | 113,360 |  | 114,487 |
Due after ten years |  | 140,225 |  | 141,018 |
Mortgage-backed securities |  | 925,018 |  | 941,043 |
Other |  | 866 |  | 906 |
Total |  | $ | 1,514,005 |  | $ | 1,536,745 |
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 December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 73,128 |  | $ | (1,194 | ) | $ | — |  | $ | — |  | $ | 73,128 |  | $ | (1,194 | )
U.S. Government sponsored entities mortgage-backed securities |  | 206,981 |  | (1,538 | ) | — |  | — |  | 206,981 |  | (1,538 | )
Corporate securities |  | 23,205 |  | (63 | ) | — |  | — |  | 23,205 |  | (63 | )
Total temporarily impaired securities |  | $ | 303,314 |  | $ | (2,795 | ) | $ | — |  | $ | — |  | $ | 303,314 |  | $ | (2,795 | )
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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