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Investments (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | A summary of investment securities available-for-sale is as follows:
|  | As of March 31, 2013 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | unrealized |  |  | unrealized |  |  | Estimated |
(Dollars in thousands) |  | cost |  |  | gains |  |  | losses |  |  | fair value |
U. S. treasury securities |  | $ | 500 |  |  | $ | 1 |  |  | $ | - |  |  | $ | 501 |
U. S. federal agency obligations |  |  | 14,598 |  |  |  | 46 |  |  |  | (24 | ) |  |  | 14,620 |
Municipal obligations, tax exempt |  |  | 79,495 |  |  |  | 3,293 |  |  |  | (61 | ) |  |  | 82,727 |
Municipal obligations, taxable |  |  | 47,598 |  |  |  | 889 |  |  |  | (99 | ) |  |  | 48,388 |
Mortgage-backed securities |  |  | 77,135 |  |  |  | 926 |  |  |  | (72 | ) |  |  | 77,989 |
Common stocks |  |  | 602 |  |  |  | 405 |  |  |  | - |  |  |  | 1,007 |
Certificates of deposit |  |  | 6,754 |  |  |  | - |  |  |  | - |  |  |  | 6,754 |
Total |  | $ | 226,682 |  |  | $ | 5,560 |  |  | $ | (256 | ) |  | $ | 231,986 |
|  | As of December 31, 2012 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | unrealized |  |  | unrealized |  |  | Estimated |
(Dollars in thousands) |  | cost |  |  | gains |  |  | losses |  |  | fair value |
U. S. federal agency obligations |  | $ | 8,804 |  |  | $ | 50 |  |  | $ | (6 | ) |  | $ | 8,848 |
Municipal obligations, tax exempt |  |  | 73,699 |  |  |  | 3,618 |  |  |  | (31 | ) |  |  | 77,286 |
Municipal obligations, taxable |  |  | 37,334 |  |  |  | 818 |  |  |  | (10 | ) |  |  | 38,142 |
Mortgage-backed securities |  |  | 81,113 |  |  |  | 889 |  |  |  | (154 | ) |  |  | 81,848 |
Common stocks |  |  | 602 |  |  |  | 301 |  |  |  | (1 | ) |  |  | 902 |
Certificates of deposit |  |  | 6,274 |  |  |  | - |  |  |  | - |  |  |  | 6,274 |
Total |  | $ | 207,826 |  |  | $ | 5,676 |  |  | $ | (202 | ) |  | $ | 213,300 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Table Text Block] | Certain of the Company’s investment securities have unrealized losses, or are temporarily impaired. This temporary impairment represents the estimated amount of loss that would be realized if the securities were sold on the valuation date. Securities which are temporarily impaired are shown below, along with the length of the impairment period.
|  |  |  |  | As of March 31, 2013 |
(Dollars in thousands) |  |  |  |  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | No. of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | securities |  |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
U. S. federal agency obligations |  |  | 3 |  |  | $ | 3,727 |  |  | $ | (24 | ) |  | $ | - |  |  | $ | - |  |  | $ | 3,727 |  |  | $ | (24 | )
Municipal obligations, tax exempt |  |  | 27 |  |  |  | 5,962 |  |  |  | (46 | ) |  |  | 1,678 |  |  |  | (15 | ) |  |  | 7,640 |  |  |  | (61 | )
Municipal obligations, taxable |  |  | 28 |  |  |  | 11,170 |  |  |  | (95 | ) |  |  | 782 |  |  |  | (4 | ) |  |  | 11,952 |  |  |  | (99 | )
Mortgage-backed securities |  |  | 15 |  |  |  | 14,620 |  |  |  | (72 | ) |  |  | - |  |  |  | - |  |  |  | 14,620 |  |  |  | (72 | )
Total |  |  | 73 |  |  | $ | 35,479 |  |  | $ | (237 | ) |  | $ | 2,460 |  |  | $ | (19 | ) |  | $ | 37,939 |  |  | $ | (256 | )
|  |  |  |  | As of December 31, 2012 |
(Dollars in thousands) |  |  |  |  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | No. of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | securities |  |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
U. S. federal agency obligations |  |  | 2 |  |  | $ | 2,241 |  |  | $ | (6 | ) |  | $ | - |  |  | $ | - |  |  | $ | 2,241 |  |  | $ | (6 | )
Municipal obligations, tax exempt |  |  | 16 |  |  |  | 4,669 |  |  |  | (31 | ) |  |  | - |  |  |  | - |  |  |  | 4,669 |  |  |  | (31 | )
Municipal obligations, taxable |  |  | 8 |  |  |  | 2,948 |  |  |  | (8 | ) |  |  | 209 |  |  |  | (2 | ) |  |  | 3,157 |  |  |  | (10 | )
Mortgage-backed securities |  |  | 24 |  |  |  | 27,974 |  |  |  | (154 | ) |  |  | - |  |  |  | - |  |  |  | 27,974 |  |  |  | (154 | )
Common stocks |  |  | 1 |  |  |  | 21 |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | 21 |  |  |  | (1 | )
Total |  |  | 51 |  |  | $ | 37,853 |  |  | $ | (200 | ) |  | $ | 209 |  |  | $ | (2 | ) |  | $ | 38,062 |  |  | $ | (202 | )
Available For Sale Securities Debt Maturities [Table Text Block] | Maturities of investment securities at March 31, 2013 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due in less than one year |  | $ | 16,168 |  |  | $ | 16,252 |
Due after one year but within five years |  |  | 134,263 |  |  |  | 136,233 |
Due after five years but within ten years |  |  | 63,453 |  |  |  | 65,716 |
Due after ten years |  |  | 12,196 |  |  |  | 12,778 |
Common stocks |  |  | 602 |  |  |  | 1,007 |
Total |  | $ | 226,682 |  |  | $ | 231,986 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross realized gains and losses on sales of available-for-sale investment securities are as follows:
|  | Three months ended |
(Dollars in thousands) |  | March 31, |
|  | 2013 |  |  | 2012 |
Realized gains |  | $ | - |  |  | $ | 227 |
Realized losses |  |  | - |  |  |  | - |
Total |  | $ | - |  |  | $ | 227 |

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