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Securities (Tables) | 6 Months Ended
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Jun. 30, 2012
Securities [Abstract] |
Securities held for investment and securities available for sale |
|  | June 30, 2012 |
|  | (Dollars in thousands) |
Held for investment, at cost (market value: $20,104) |  | $ | 19,734 |
Available for sale, at market value |  |  | 555,300 |
Total |  | $ | 575,034 |
Amortized cost and estimated market values of securities held for investment |
|  | June 30, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
U.S. treasury and other Federal agencies |  | $ | 901 |  |  | $ | 68 |  |  | $ | — |  |  | $ | 969 |
States and political subdivisions |  |  | 18,833 |  |  |  | 302 |  |  |  | — |  |  |  | 19,135 |
Total |  | $ | 19,734 |  |  | $ | 370 |  |  | $ | — |  |  | $ | 20,104 |
Amortized cost and estimated market values of securities available for sale |
|  | June 30, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
U.S. Federal agencies (1) |  | $ | 455,175 |  |  | $ | 4,512 |  |  | $ | (121 | ) |  | $ | 459,566 |
Mortgage backed securities |  |  | 23,869 |  |  |  | 843 |  |  |  | (3 | ) |  |  | 24,709 |
States and political subdivisions |  |  | 57,540 |  |  |  | 3,008 |  |  |  | (10 | ) |  |  | 60,538 |
Other securities (2) |  |  | 8,011 |  |  |  | 2,498 |  |  |  | (22 | ) |  |  | 10,487 |
Total |  | $ | 544,595 |  |  | $ | 10,861 |  |  | $ | (156 | ) |  | $ | 555,300 |
(1) | Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
(2) | Primarily consists of equity securities.
Maturity of securities |
|  | June 30, 2012 |
|  | Amortized Cost |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
Held for Investment |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 1,583 |  |  | $ | 1,602 |
After one year but within five years |  |  | 14,679 |  |  |  | 14,909 |
After five years but within ten years |  |  | 2,830 |  |  |  | 2,889 |
After ten years |  |  | 642 |  |  |  | 704 |
Total |  | $ | 19,734 |  |  | $ | 20,104 |
Available for Sale |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 85,373 |  |  | $ | 86,441 |
After one year but within five years |  |  | 323,771 |  |  |  | 326,413 |
After five years but within ten years |  |  | 46,982 |  |  |  | 49,031 |
After ten years |  |  | 80,458 |  |  |  | 82,928 |
Total debt securities |  |  | 536,584 |  |  |  | 544,813 |
Equity securities |  |  | 8,011 |  |  |  | 10,487 |
Total |  | $ | 544,595 |  |  | $ | 555,300 |
Company's book value of pledged securities |
|  | June 30, 2012 |
|  | (Dollars in thousands) |
Book value of pledged securities |  | $ | 484,329 |

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