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Securities Available-For-Sale (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following tables present information related to the Company’s securities at March 31, 2017 and December 31, 2016 (dollars in thousands):
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
March 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 56,670 |  | $ | 257 |  | $ | (277 | ) |  | $ | 56,650
Residential mortgage pass-through securities |  |  | 104,850 |  |  | 602 |  |  | (981 | ) |  |  | 104,471
Commercial mortgage pass-through securities |  |  | 4,153 |  |  | 32 |  |  | - |  |  |  | 4,185
Obligations of U.S. states and political subdivisions |  |  | 123,913 |  |  | 2,008 |  |  | (915 | ) |  |  | 125,006
Trust preferred securities |  |  | 4,576 |  |  | 97 |  |  | (131 | ) |  |  | 4,542
Corporate bonds and notes |  |  | 30,602 |  |  | 242 |  |  | (297 | ) |  |  | 30,547
Asset-backed securities |  |  | 14,058 |  |  | 23 |  |  | (112 | ) |  |  | 13,969
Certificates of deposit |  |  | 972 |  |  | 9 |  |  | - |  |  |  | 981
Equity securities |  |  | 376 |  |  | 232 |  |  | - |  |  |  | 608
Other securities |  |  | 11,851 |  |  | - |  |  | (334 | ) |  |  | 11,517
Total securities available-for-sale |  | $ | 352,021 |  | $ | 3,502 |  | $ | (3,047 | ) |  | $ | 352,476
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
December 31, 2016 |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 52,826 |  | $ | 282 |  | $ | (271 | ) |  | $ | 52,837
Residential mortgage pass-through securities |  |  | 72,922 |  |  | 519 |  |  | (944 | ) |  |  | 72,497
Commercial mortgage pass-through securities |  |  | 4,186 |  |  | 23 |  |  | - |  |  |  | 4,209
Obligations of U.S. states and political subdivisions |  |  | 148,747 |  |  | 2,789 |  |  | (931 | ) |  |  | 150,605
Trust preferred securities |  |  | 5,575 |  |  | 242 |  |  | (151 | ) |  |  | 5,666
Corporate bonds and notes |  |  | 36,717 |  |  | 586 |  |  | (375 | ) |  |  | 36,928
Asset-backed securities |  |  | 14,867 |  |  | 2 |  |  | (286 | ) |  |  | 14,583
Certificates of deposit |  |  | 973 |  |  | 10 |  |  | - |  |  |  | 983
Equity securities |  |  | 376 |  |  | 192 |  |  | - |  |  |  | 568
Other securities |  |  | 14,739 |  |  | - |  |  | (325 | ) |  |  | 14,414
Total securities available-for-sale |  | $ | 351,928 |  | $ | 4,645 |  | $ | (3,283 | ) |  | $ | 353,290
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for securities at March 31, 2017, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer.
| March 31, 2017
| Amortized |  | Fair
| Cost |  | Value
| (dollars in thousands)
Securities available-for-sale: |  |  |  |  |
Due in one year or less | $ | 3,467 |  | $ | 3,504
Due after one year through five years |  | 30,171 |  |  | 30,401
Due after five years through ten years |  | 43,973 |  |  | 44,432
Due after ten years |  | 153,180 |  |  | 153,358
Residential mortgage pass-through securities |  | 104,850 |  |  | 104,471
Commercial mortgage pass-through securities |  | 4,153 |  |  | 4,185
Equity securities |  | 376 |  |  | 608
Other securities |  | 11,851 |  |  | 11,517
Total | $ | 352,021 |  | $ | 352,476
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales for the three months ended March 31, 2017 and 2016 were as follows:
|  | Three Months Ended
|  | March 31,
(dollars in thousands) |  | 2017 |  | 2016
Proceeds |  | $ | 29,543 |  |  | $ | -
Gross gains on sales of securities |  |  | 1,596 |  |  |  | -
Gross losses on sales of securities |  |  | - |  |  |  | -
Net gains on sales of securities |  |  | 1,596 |  |  |  | -
Less: tax provision on net gains |  |  | (579 | ) |  |  | -
Net gains on sales of securities, after tax |  | $ | 1,017 |  |  | $ | -
Schedule of Unrealized Loss on Investments [Table Text Block] | The following tables indicate gross unrealized losses not recognized in income and fair value, aggregated by investment category and the length of time individual securities have been in a continuous unrealized loss position at March 31, 2017 and December 31, 2016:
|  | March 31, 2017
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 31,077 |  | $ | (277 | ) |  | $ | 29,864 |  | $ | (269 | ) |  | $ | 1,213 |  | $ | (8 | )
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
pass-through securities |  |  | 62,928 |  |  | (981 | ) |  |  | 61,465 |  |  | (946 | ) |  |  | 1,463 |  |  | (35 | )
Obligations of U.S. states |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
and political subdivisions |  |  | 45,800 |  |  | (915 | ) |  |  | 45,800 |  |  | (915 | ) |  |  | - |  |  | - |
Trust preferred securities |  |  | 1,447 |  |  | (131 | ) |  |  | - |  |  | - |  |  |  | 1,447 |  |  | (131 | )
Corporate bonds and notes |  |  | 14,006 |  |  | (297 | ) |  |  | 2,803 |  |  | (163 | ) |  |  | 11,203 |  |  | (134 | )
Asset-backed securities |  |  | 8,628 |  |  | (112 | ) |  |  | - |  |  | - |  |  |  | 8,628 |  |  | (112 | )
Other securities |  |  | 11,132 |  |  | (334 | ) |  |  | - |  |  | - |  |  |  | 11,132 |  |  | (334 | )
Total temporarily impaired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  | $ | 175,018 |  | $ | (3,047 | ) |  | $ | 139,932 |  | $ | (2,293 | ) |  | $ | 35,086 |  | $ | (754 | )
|  | December 31, 2016
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  |  |  |  |  |  |  |  |  | (dollars in thousands) |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 22,672 |  | $ | (271 | ) |  | $ | 21,416 |  | $ | (262 | ) |  | $ | 1,256 |  | $ | (9 | )
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
pass-through securities |  |  | 50,136 |  |  | (944 | ) |  |  | 49,817 |  |  | (937 | ) |  |  | 319 |  |  | (7 | )
Obligations of U.S. states |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
and political subdivisions |  |  | 52,307 |  |  | (931 | ) |  |  | 52,307 |  |  | (931 | ) |  |  | - |  |  | - |
Trust preferred securities |  |  | 1,427 |  |  | (151 | ) |  |  | - |  |  | - |  |  |  | 1,427 |  |  | (151 | )
Corporate bonds and notes |  |  | 15,930 |  |  | (375 | ) |  |  | 7,671 |  |  | (265 | ) |  |  | 8,259 |  |  | (110 | )
Asset-backed securities |  |  | 13,404 |  |  | (286 | ) |  |  | 3,743 |  |  | (88 | ) |  |  | 9,661 |  |  | (198 | )
Other securities |  |  | 11,467 |  |  | (325 | ) |  |  | - |  |  | - |  |  |  | 11,467 |  |  | (325 | )
Total temporarily impaired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  | $ | 167,343 |  | $ | (3,283 | ) |  | $ | 134,954 |  | $ | (2,483 | ) |  | $ | 32,389 |  | $ | (800 | )

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