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Securities (Tables) | 9 Months Ended
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Sep. 30, 2012
Securities [Abstract] |
Securities held for investment and securities available for sale |
|  | September 30, 2012 |
|  | (Dollars in thousands) |
Held for investment, at cost (market value: $17,080) |  | $ | 16,769 |
Available for sale, at market value |  |  | 523,706 |
Total |  | $ | 540,475 |
Amortized cost and estimated market values of securities held for investment |
|  | September 30, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
U.S. treasury and other Federal agencies |  | $ | 844 |  |  | $ | 65 |  |  | $ | — |  |  | $ | 909 |
States and political subdivisions |  |  | 15,925 |  |  |  | 254 |  |  |  | (8 | ) |  |  | 16,171 |
Total |  | $ | 16,769 |  |  | $ | 319 |  |  | $ | (8 | ) |  | $ | 17,080 |
Amortized cost and estimated market values of securities available for sale |
|  | September 30, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
U.S. Federal agencies (1) |  | $ | 429,163 |  |  | $ | 4,126 |  |  | $ | (158 | ) |  | $ | 433,131 |
Mortgage backed securities |  |  | 21,453 |  |  |  | 939 |  |  |  | (2 | ) |  |  | 22,390 |
States and political subdivisions |  |  | 54,631 |  |  |  | 3,219 |  |  |  | (21 | ) |  |  | 57,829 |
Other securities (2) |  |  | 8,145 |  |  |  | 2,233 |  |  |  | (22 | ) |  |  | 10,356 |
Total |  | $ | 513,392 |  |  | $ | 10,517 |  |  | $ | (203 | ) |  | $ | 523,706 |
(1) | Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
(2) | Primarily consists of equity securities.
Maturity of securities |
|  | September 30, 2012 |
|  | Amortized Cost |  |  | Estimated Market Value |
|  | (Dollars in thousands) |
Held for Investment |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 4,000 |  |  | $ | 4,069 |
After one year but within five years |  |  | 9,355 |  |  |  | 9,484 |
After five years but within ten years |  |  | 2,825 |  |  |  | 2,878 |
After ten years |  |  | 589 |  |  |  | 649 |
Total |  | $ | 16,769 |  |  | $ | 17,080 |
Available for Sale |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 117,905 |  |  | $ | 118,531 |
After one year but within five years |  |  | 252,639 |  |  |  | 255,416 |
After five years but within ten years |  |  | 41,284 |  |  |  | 43,218 |
After ten years |  |  | 93,419 |  |  |  | 96,185 |
Total debt securities |  |  | 505,247 |  |  |  | 513,350 |
Equity securities |  |  | 8,145 |  |  |  | 10,356 |
Total |  | $ | 513,392 |  |  | $ | 523,706 |
Company's book value of pledged securities |
|  | September 30, 2012 |
|  | (Dollars in thousands) |
Book value of pledged securities |  | $ | 453,005 |

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