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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following tables present information related to the Company’s investment securities at September 30, 2016 and December 31, 2015 (dollars in thousands):
|  |  |  | Gross |  | Gross |  |  |
| Amortized |  | Unrealized |  | Unrealized |  | Fair
September 30, 2016 | Cost |  | Gains |  | Losses |  | Value
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations | $ | 55,024 |  | $ | 1,084 |  | $ | (9 | ) |  | $ | 56,099
Residential mortgage pass-through securities |  | 62,124 |  |  | 1,292 |  |  | (12 | ) |  |  | 63,404
Commercial mortgage pass-through securities |  | 4,218 |  |  | 151 |  |  | - |  |  |  | 4,369
Obligations of U.S. states and political subdivisions |  | 135,781 |  |  | 5,582 |  |  | (2 | ) |  |  | 141,361
Trust preferred securities |  | 5,574 |  |  | 310 |  |  | (209 | ) |  |  | 5,675
Corporate bonds and notes |  | 37,725 |  |  | 916 |  |  | (348 | ) |  |  | 38,293
Asset-backed securities |  | 15,797 |  |  | 1 |  |  | (296 | ) |  |  | 15,502
Certificates of deposit |  | 973 |  |  | 15 |  |  | - |  |  |  | 988
Equity securities |  | 376 |  |  | 52 |  |  | (3 | ) |  |  | 425
Other securities |  | 12,332 |  |  | 94 |  |  | (83 | ) |  |  | 12,343
Total securities available-for-sale | $ | 329,924 |  | $ | 9,497 |  | $ | (962 | ) |  | $ | 338,459
|  |  |  | Gross |  | Gross |  |  |  |
| Amortized |  | Unrealized |  | Unrealized |  |  | Fair
December 31, 2015 | Cost |  | Gains |  | Losses |  |  | Value
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations | $ | 29,062 |  | $ | 142 |  | $ | (58 | ) |  | $ | 29,146
Residential mortgage pass-through securities |  | 44,155 |  |  | 803 |  |  | (48 | ) |  |  | 44,910
Commercial mortgage pass-through securities |  | 2,981 |  |  | - |  |  | (9 | ) |  |  | 2,972
Obligations of U.S. states and political subdivisions |  | 8,188 |  |  | 169 |  |  | - |  |  |  | 8,357
Trust preferred securities |  | 16,088 |  |  | 398 |  |  | (231 | ) |  |  | 16,255
Corporate bonds and notes |  | 53,566 |  |  | 702 |  |  | (292 | ) |  |  | 53,976
Asset-backed securities |  | 20,005 |  |  | 18 |  |  | (298 | ) |  |  | 19,725
Certificates of deposit |  | 1,895 |  |  | 18 |  |  | (8 | ) |  |  | 1,905
Equity securities |  | 376 |  |  | 21 |  |  | (23 | ) |  |  | 374
Other securities |  | 18,303 |  |  | - |  |  | (153 | ) |  |  | 18,150
Total securities available-for-sale | $ | 194,619 |  | $ | 2,271 |  | $ | (1,120 | ) |  | $ | 195,770
|  |  |  | Gross |  | Gross |  |  |  |
| Amortized |  | Unrecognized |  | Unrecognized |  |  | Fair
| Cost |  | Gains |  | Losses |  |  | Value
Investment securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency securities | $ | 28,471 |  | $ | 755 |  | $ | - |  |  | $ | 29,226
Federal agency obligations |  | 33,616 |  |  | 280 |  |  | (119 | ) |  |  | 33,777
Residential mortgage-backed securities |  | 3,805 |  |  | 11 |  |  | (6 | ) |  |  | 3,810
Commercial mortgage-backed securities |  | 4,110 |  |  | 27 |  |  | (2 | ) |  |  | 4,135
Obligations of U.S. states and political divisions |  | 118,015 |  |  | 5,001 |  |  | (3 | ) |  |  | 123,013
Corporate bonds and notes |  | 36,039 |  |  | 719 |  |  | (161 | ) |  |  | 36,597
Total securities held-to-maturity | $ | 224,056 |  | $ | 6,793 |  | $ | (291 | ) |  | $ | 230,558
Total investment securities | $ | 418,675 |  | $ | 9,064 |  | $ | (1,411 | ) |  | $ | 426,328
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investment securities at September 30, 2016, 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, 2016
| Amortized |  | Fair
| Cost |  | Value
| (in thousands)
Investment securities available-for-sale: |  |  |  |  |
Due in one year or less | $ | 3,886 |  | $ | 3,906
Due after one year through five years |  | 26,238 |  |  | 26,914
Due after five years through ten years |  | 55,486 |  |  | 57,204
Due after ten years |  | 165,264 |  |  | 169,894
Residential mortgage pass-through securities |  | 62,124 |  |  | 63,404
Commercial mortgage pass-through securities |  | 4,218 |  |  | 4,369
Equity securities |  | 376 |  |  | 425
Other securities |  | 12,332 |  |  | 12,343
Total | $ | 329,924 |  | $ | 338,459
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales, calls and maturities of investment securities for the three-month and nine-month periods ended September 30, 2016 and 2015 were as follows:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(in thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Proceeds |  | $ | 78,680 |  | $ | 32,125 |  | $ | 85,253 |  | $ | 44,397
Gross gains on sales of investment securities |  |  | 4,131 |  |  | 2,067 |  |  | 4,234 |  |  | 2,793
Gross losses on sales of investment securities |  |  | - |  |  | - |  |  | - |  |  | -
Net gains on sales of investment securities |  |  | 4,131 |  |  | 2,067 |  |  | 4,234 |  |  | 2,793
Less: tax provision on net gains |  |  | 1,640 |  |  | 794 |  |  | 1,682 |  |  | 1,091
Total |  | $ | 2,491 |  | $ | 1,273 |  | $ | 2,552 |  | $ | 1,702
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, 2016 and December 31, 2015:
| September 30, 2016
| Total |  | Less than 12 Months |  | 12 Months or Longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
| Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
| (in thousands)
Investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation | $ | 2,685 |  | $ | (9 | ) |  | $ | 1,366 |  | $ | (3 | ) |  | $ | 1,319 |  | $ | (6 | )
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
pass-through securities |  | 2,978 |  |  | (12 | ) |  |  | 2,596 |  |  | (9 | ) |  |  | 382 |  |  | (3 | )
Obligations of U.S. states |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
and political subdivisions |  | 575 |  |  | (2 | ) |  |  | 575 |  |  | (2 | ) |  |  |  |  |  |  |
Trust preferred securities |  | 1,369 |  |  | (209 | ) |  |  | - |  |  | - |  |  |  | 1,369 |  |  | (209 | )
Corporate bonds and notes |  | 13,945 |  |  | (348 | ) |  |  | 5,741 |  |  | (185 | ) |  |  | 8,204 |  |  | (163 | )
Asset-backed securities |  | 14,025 |  |  | (296 | ) |  |  | 3,891 |  |  | (72 | ) |  |  | 10,134 |  |  | (224 | )
Equity securities |  | 134 |  |  | (3 | ) |  |  | - |  |  | - |  |  |  | 134 |  |  | (3 | )
Other securities |  | 5,417 |  |  | (83 | ) |  |  | - |  |  | - |  |  |  | 5,417 |  |  | (83 | )
Total temporarily impaired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities | $ | 41,128 |  | $ | (962 | ) |  | $ | 14,169 |  | $ | (271 | ) |  | $ | 26,959 |  | $ | (691 | )
| December 31, 2015
|  | Total |  |  |  | Less than 12 Months |  |  | 12 Months or Longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
| Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  |  |  |  |  |  |  |  | (dollars in thousands) |  |  |  |  |  |  |  |
Investment Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation | $ | 12,260 |  | $ | (58 | ) |  | $ | 12,013 |  | $ | (54 | ) |  | $ | 247 |  | $ | (4 | )
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
pass-through securities |  | 9,027 |  |  | (48 | ) |  |  | 9,027 |  |  | (48 | ) |  |  | - |  |  | - |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  | 2,971 |  |  | (9 | ) |  |  | 2,971 |  |  | (9 | ) |  |  | - |  |  | - |
Trust preferred securities |  | 1,345 |  |  | (231 | ) |  |  | - |  |  | - |  |  |  | 1,345 |  |  | (231 | )
Corporate bonds and notes |  | 16,533 |  |  | (292 | ) |  |  | 12,702 |  |  | (161 | ) |  |  | 3,831 |  |  | (131 | )
Asset-backed securities |  | 14,745 |  |  | (298 | ) |  |  | 11,250 |  |  | (188 | ) |  |  | 3,495 |  |  | (110 | )
Certificates of deposit |  | 215 |  |  | (8 | ) |  |  | 215 |  |  | (8 | ) |  |  | - |  |  | - |
Equity securities |  | 123 |  |  | (23 | ) |  |  | - |  |  | - |  |  |  | 123 |  |  | (23 | )
Other securities |  | 5,347 |  |  | (153 | ) |  |  | - |  |  | - |  |  |  | 5,347 |  |  | (153 | )
Total | $ | 62,566 |  | $ | (1,120 | ) |  | $ | 48,178 |  | $ | (468 | ) |  | $ | 14,388 |  | $ | (652 | )
Investment Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | 12,554 |  |  | (119 | ) |  |  | 11,783 |  |  | (109 | ) |  |  | 771 |  |  | (10 | )
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
pass-through securities |  | 2,480 |  |  | (6 | ) |  |  | 2,480 |  |  | (6 | ) |  |  | - |  |  | - |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  | 1,331 |  |  | (2 | ) |  |  | 1,331 |  |  | (2 | ) |  |  | - |  |  | - |
Obligations of U.S. states |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
and political subdivisions |  | 981 |  |  | (3 | ) |  |  | 981 |  |  | (3 | ) |  |  | - |  |  | - |
Corporate bonds and notes |  | 5,536 |  |  | (161 | ) |  |  | 5,536 |  |  | (161 | ) |  |  | - |  |  | - |
Total | $ | 22,882 |  | $ | (291 | ) |  | $ | 22,111 |  | $ | (281 | ) |  | $ | 771 |  | $ | (10 | )
Total Temporarily Impaired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities | $ | 85,448 |  | $ | (1,411 | ) |  | $ | 70,289 |  | $ | (749 | ) |  | $ | 15,159 |  | $ | (662 | )

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