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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | A summary of investment securities available-for-sale is as follows:
(Dollars in thousands) |  | As of December 31, 2015 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Estimated |
|  | cost |  | gains |  | losses |  | fair value |
U. S. treasury securities |  | $ | 6,517 |  | $ | 1 |  | $ | (1) |  | $ | 6,517 |
U. S. federal agency obligations |  |  | 30,064 |  |  | 43 |  |  | (187) |  |  | 29,920 |
Municipal obligations, tax exempt |  |  | 135,341 |  |  | 2,671 |  |  | (71) |  |  | 137,941 |
Municipal obligations, taxable |  |  | 81,999 |  |  | 472 |  |  | (581) |  |  | 81,890 |
Agency mortgage-backed securities |  |  | 85,829 |  |  | 391 |  |  | (235) |  |  | 85,985 |
Common stocks |  |  | 580 |  |  | 906 |  |  | - |  |  | 1,486 |
Certificates of deposit |  |  | 9,699 |  |  | - |  |  | - |  |  | 9,699 |
Total |  | $ | 350,029 |  | $ | 4,484 |  | $ | (1,075) |  | $ | 353,438 |
|  | As of December 31, 2014 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Estimated |
|  | cost |  | gains |  | losses |  | fair value |
U. S. treasury securities |  | $ | 6,530 |  | $ | 1 |  | $ | (1) |  | $ | 6,530 |
U. S. federal agency obligations |  |  | 25,983 |  |  | 34 |  |  | (274) |  |  | 25,743 |
Municipal obligations, tax exempt |  |  | 108,752 |  |  | 1,937 |  |  | (180) |  |  | 110,509 |
Municipal obligations, taxable |  |  | 63,728 |  |  | 544 |  |  | (350) |  |  | 63,922 |
Agency mortgage-backed securities |  |  | 135,072 |  |  | 1,152 |  |  | (705) |  |  | 135,519 |
Common stocks |  |  | 588 |  |  | 695 |  |  | - |  |  | 1,283 |
Certificates of deposit |  |  | 5,425 |  |  | - |  |  | - |  |  | 5,425 |
Total |  | $ | 346,078 |  | $ | 4,363 |  | $ | (1,510) |  | $ | 348,931 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Table Text Block] | Securities which were temporarily impaired are shown below, along with the length of time in a continuous unrealized loss position.
(Dollars in thousands) |  |  |  |  | As of December 31, 2015 |
|  |  |  |  | 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. treasury securities |  |  | 2 |  | $ | 3,542 |  | $ | (1) |  | $ | - |  | $ | - |  | $ | 3,542 |  | $ | (1) |
U.S. federal agency obligations |  |  | 18 |  |  | 23,015 |  |  | (163) |  |  | 1,976 |  |  | (24) |  |  | 24,991 |  |  | (187) |
Municipal obligations, tax exempt |  |  | 47 |  |  | 11,328 |  |  | (53) |  |  | 2,132 |  |  | (18) |  |  | 13,460 |  |  | (71) |
Municipal obligations, taxable |  |  | 105 |  |  | 38,605 |  |  | (494) |  |  | 5,068 |  |  | (87) |  |  | 43,673 |  |  | (581) |
Agency mortgage-backed securities |  |  | 40 |  |  | 29,814 |  |  | (166) |  |  | 2,925 |  |  | (69) |  |  | 32,739 |  |  | (235) |
Total |  |  | 212 |  | $ | 106,304 |  | $ | (877) |  | $ | 12,101 |  | $ | (198) |  | $ | 118,405 |  | $ | (1,075) |
|  |  |  |  | As of December 31, 2014 |
|  |  |  |  | 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. treasury securities |  |  | 1 |  | $ | 2,960 |  | $ | (1) |  | $ | - |  | $ | - |  | $ | 2,960 |  | $ | (1) |
U.S. federal agency obligations |  |  | 14 |  |  | 7,361 |  |  | (14) |  |  | 11,958 |  |  | (260) |  |  | 19,319 |  |  | (274) |
Municipal obligations, tax exempt |  |  | 71 |  |  | 13,927 |  |  | (66) |  |  | 7,329 |  |  | (114) |  |  | 21,256 |  |  | (180) |
Municipal obligations, taxable |  |  | 74 |  |  | 14,797 |  |  | (92) |  |  | 14,827 |  |  | (258) |  |  | 29,624 |  |  | (350) |
Agency mortgage-backed securities |  |  | 29 |  |  | 17,535 |  |  | (76) |  |  | 25,759 |  |  | (629) |  |  | 43,294 |  |  | (705) |
Total |  |  | 189 |  | $ | 56,580 |  | $ | (249) |  | $ | 59,873 |  | $ | (1,261) |  | $ | 116,453 |  | $ | (1,510) |
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost and fair value of investment securities at December 31, 2015 are as follows:
(Dollars in thousands) |  | Amortized |  | Estimated |
|  | cost |  | fair value |
Due in less than one year |  | $ | 11,263 |  | $ | 11,298 |
Due after one year but within five years |  |  | 191,976 |  |  | 192,345 |
Due after five years but within ten years |  |  | 88,867 |  |  | 90,216 |
Due after ten years |  |  | 57,343 |  |  | 58,093 |
Common stocks |  |  | 580 |  |  | 1,486 |
Total |  | $ | 350,029 |  | $ | 353,438 |
Schedule of Realized Gain (Loss) [Table Text Block] | Sales proceeds and gross realized gains and losses on sales of available-for-sale securities are as follows:
(Dollars in thousands) |  | Years ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Sales proceeds |  | $ | 30,610 |  | $ | 8,265 |  | $ | 6,348 |
Realized gains |  | $ | 230 |  | $ | 125 |  | $ | - |
Realized losses |  |  | (349) |  |  | (26) |  |  | - |
Net realized (losses) gains |  | $ | (119) |  | $ | 99 |  | $ | - |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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