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Securities Available-For-Sale (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2017 and December 31, 2016:
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
September 30, 2017 |  | Cost |  | Gains |  | Losses |  | Value
|  | (dollars in thousands)
Federal agency obligations |  | $ | 55,819 |  | $ | 290 |  | $ | (171 | ) |  | $ | 55,938
Residential mortgage pass-through securities |  |  | 133,517 |  |  | 668 |  |  | (1,021 | ) |  |  | 133,164
Commercial mortgage pass-through securities |  |  | 4,088 |  |  | 42 |  |  | - |  |  |  | 4,130
Obligations of U.S. states and political subdivisions |  |  | 143,787 |  |  | 2,233 |  |  | (1,044 | ) |  |  | 144,976
Trust preferred securities |  |  | 4,576 |  |  | 122 |  |  | (71 | ) |  |  | 4,627
Corporate bonds and notes |  |  | 30,052 |  |  | 255 |  |  | (219 | ) |  |  | 30,088
Asset-backed securities |  |  | 12,605 |  |  | 66 |  |  | (38 | ) |  |  | 12,633
Certificates of deposit |  |  | 622 |  |  | 5 |  |  | - |  |  |  | 627
Equity securities |  |  | 376 |  |  | 254 |  |  | - |  |  |  | 630
Other securities |  |  | 13,976 |  |  | - |  |  | (273 | ) |  |  | 13,703
Total securities available-for-sale |  | $ | 399,418 |  | $ | 3,935 |  | $ | (2,837 | ) |  | $ | 400,516
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |  | Fair
December 31, 2016 |  | Cost |  | Gains |  | Losses |  |  | Value
|  | (dollars in thousands)
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 September 30, 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.
|  | September 30, 2017
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |
Due in one year or less |  | $ | 6,775 |  | $ | 6,801
Due after one year through five years |  |  | 30,824 |  |  | 31,197
Due after five years through ten years |  |  | 39,489 |  |  | 40,174
Due after ten years |  |  | 170,373 |  |  | 170,717
Residential mortgage pass-through securities |  |  | 133,517 |  |  | 133,164
Commercial mortgage pass-through securities |  |  | 4,088 |  |  | 4,130
Equity securities |  |  | 376 |  |  | 630
Other securities |  |  | 13,976 |  |  | 13,703
Total |  | $ | 399,418 |  | $ | 400,516
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales, calls and maturities of securities for periods presented were as follows (dollars in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Net gains on sales of securities, after tax |  | $ | - |  | $ | 78,680 |  | $ | 29,543 |  | $ | 85,253
Gross gains on sales of securities |  |  | - |  |  | 4,131 |  |  | 1,596 |  |  | 4,234
Gross losses on sales of securities |  |  | - |  |  | - |  |  | - |  |  | -
Net gains on sales of securities |  |  | - |  |  | 4,131 |  |  | 1,596 |  |  | 4,234
Less: tax provision on net gains |  |  | - |  |  | 1,640 |  |  | 579 |  |  | 1,682
Net gains on sales of securities, after tax |  | $ | - |  | $ | 2,491 |  | $ | 1,017 |  | $ | 2,552
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 September 30, 2017 and December 31, 2016:
|  | September 30, 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)
Federal agency obligation |  | $ | 21,451 |  | $ | (171 | ) |  | $ | 17,679 |  | $ | (116 | ) |  | $ | 3,772 |  | $ | (55 | )
Residential mortgage pass-through securities |  |  | 77,391 |  |  | (1,021 | ) |  |  | 49,079 |  |  | (457 | ) |  |  | 28,312 |  |  | (564 | )
Obligations of U.S. states and political subdivisions |  |  | 54,073 |  |  | (1,044 | ) |  |  | 47,016 |  |  | (829 | ) |  |  | 7,057 |  |  | (215 | )
Trust preferred securities |  |  | 1,507 |  |  | (71 | ) |  |  | - |  |  | - |  |  |  | 1,507 |  |  | (71 | )
Corporate bonds and notes |  |  | 13,123 |  |  | (219 | ) |  |  | 3,946 |  |  | (38 | ) |  |  | 9,177 |  |  | (181 | )
Asset-backed securities |  |  | 7,929 |  |  | (38 | ) |  |  | - |  |  | - |  |  |  | 7,929 |  |  | (38 | )
Other securities |  |  | 11,193 |  |  | (273 | ) |  |  | 5,911 |  |  | (56 | ) |  |  | 5,282 |  |  | (217 | )
Total temporarily impaired securities |  | $ | 186,667 |  | $ | (2,837 | ) |  | $ | 123,631 |  | $ | (1,496 | ) |  | $ | 63,036 |  | $ | (1,341 | )
|  | 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)
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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