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Investments (Tables) | 9 Months Ended
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Sep. 30, 2016
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 September 30, 2016 |
|  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Estimated |
(Dollars in thousands) |  | cost |  | gains |  | losses |  | fair value |
U. S. treasury securities |  | $ | 6,008 |  | $ | 22 |  | $ | - |  | $ | 6,030 |
U. S. federal agency obligations |  |  | 27,188 |  |  | 167 |  |  | (6) |  |  | 27,349 |
Municipal obligations, tax-exempt |  |  | 160,122 |  |  | 3,907 |  |  | (181) |  |  | 163,848 |
Municipal obligations, taxable |  |  | 71,680 |  |  | 1,949 |  |  | (1) |  |  | 73,628 |
Agency mortgage-backed securities |  |  | 91,331 |  |  | 1,580 |  |  | (42) |  |  | 92,869 |
Common stocks |  |  | 458 |  |  | 544 |  |  | - |  |  | 1,002 |
Certificates of deposit |  |  | 9,700 |  |  | - |  |  | - |  |  | 9,700 |
Total |  | $ | 366,487 |  | $ | 8,169 |  | $ | (230) |  | $ | 374,426 |
|  | As of December 31, 2015 |
|  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Estimated |
(Dollars in thousands) |  | 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 |
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.
|  |  |  | As of September 30, 2016 |
(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 |  | $ | 6,198 |  | $ | (6) |  | $ | - |  | $ | - |  | $ | 6,198 |  | $ | (6) |
Municipal obligations, tax-exempt |  |  | 78 |  |  | 27,441 |  |  | (181) |  |  | - |  |  | - |  |  | 27,441 |  |  | (181) |
Municipal obligations, taxable |  |  | 2 |  |  | 567 |  |  | (1) |  |  | - |  |  | - |  |  | 567 |  |  | (1) |
Agency mortgage-backed securities |  |  | 19 |  |  | 10,936 |  |  | (42) |  |  | - |  |  | - |  |  | 10,936 |  |  | (42) |
Total |  |  | 102 |  | $ | 45,142 |  | $ | (230) |  | $ | - |  | $ | - |  | $ | 45,142 |  | $ | (230) |
|  |  |  | As of December 31, 2015 |
(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. 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) |
Investments Classified by Contractual Maturity Date [Table Text Block] | The table below of the amortized cost and estimated fair value of investment securities includes scheduled principal payments and estimated prepayments, based on observable market inputs, for agency mortgage-backed securities. Actual maturities will differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties. The amortized cost and fair value of investment securities at September 30, 2016 are as follows:
(Dollars in thousands) |  | Amortized |  | Estimated |
|  | cost |  | fair value |
Due in less than one year |  | $ | 25,963 |  | $ | 26,067 |
Due after one year but within five years |  |  | 182,604 |  |  | 184,791 |
Due after five years but within ten years |  |  | 89,280 |  |  | 92,434 |
Due after ten years |  |  | 68,182 |  |  | 70,132 |
Common stocks |  |  | 458 |  |  | 1,002 |
Total |  | $ | 366,487 |  | $ | 374,426 |
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 for the periods indicated:
(Dollars in thousands) |  | Three months ended |  | Nine months ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Sales proceeds |  | $ | 708 |  | $ | 11,541 |  | $ | 14,326 |  | $ | 30,610 |
Realized gains |  | $ | 261 |  | $ | 206 |  | $ | 573 |  | $ | 230 |
Realized losses |  |  | - |  |  | (71) |  |  | (15) |  |  | (349) |
Net realized gains (losses) |  | $ | 261 |  | $ | 135 |  | $ | 558 |  | $ | (119) |

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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