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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 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 portfolio of securities available-for-sale and held-to-maturity at December 31, 2016 and 2015.
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (dollars in thousands)
December 31, 2016 |  |
Investment 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
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2015 |  | (dollars in thousands)
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
|  |  | Amortized Cost |  |  | Gross Unrecognized Gains |  |  | Gross Unrecognized Losses |  |  | Fair 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 subdivisions |  |  | 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 |
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale at December 31, 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. Securities not due at a single maturity date are shown separately.
|  | December 31, 2016 |
|  | Amortized Cost |  | Fair Value |
|  | (dollars in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |
Due in one year or less |  | $ | 5,003 |  | $ | 5,054 |
Due after one year through five years |  |  | 32,045 |  |  | 32,406 |
Due after five years through ten years |  |  | 50,718 |  |  | 51,473 |
Due after ten years |  |  | 171,939 |  |  | 172,669 |
Residential mortgage pass-through securities |  |  | 72,922 |  |  | 72,497 |
Commercial mortgage pass-through securities |  |  | 4,186 |  |  | 4,209 |
Equity securities |  |  | 376 |  |  | 568 |
Other securities |  |  | 14,739 |  |  | 14,414 |
Total securities available-for-sale |  | $ | 351,928 |  | $ | 353,290 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales, calls, and maturities of investment securities for the years ended December 31, 2016, 2015 and 2014 were as follows (dollars in thousands):
|  | Years Ended December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Proceeds |  | $ | 85,253 |  | $ | 65,231 |  | $ | 81,844 |
Gross gains on sales of investment securities |  | $ | 4,234 |  | $ | 3,931 |  | $ | 2,837 |
Gross losses on sales of investment securities |  |  | - |  |  | - |  |  | 19 |
Net gains on sales of investment securities |  |  | 4,234 |  |  | 3,931 |  |  | 2,818 |
Less: tax provision on net gains |  |  | (1,682) |  |  | (1,564) |  |  | (986) |
Net gains on sales of investment securities, after tax |  | $ | 2,552 |  | $ | 2,367 |  | $ | 1,832 |
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 December 31, 2016 and 2015. There were no investments held-to-maturity as of December 31, 2016.
|  | December 31, 2016 |
|  | Total |  | Less than 12 Months |  | 12 Months or Longer |
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
|  | (dollars in thousands) |
Investment 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) |
|  | December 31, 2015 |
|  | Total |  | Less than 12 Months |  | 12 Months or Longer |
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
|  | (dollars in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 6,755 |  | $ | (50) |  | $ | 2,770 |  | $ | (9) |  | $ | 3,985 |  | $ | (41) |
Residential mortgage pass-through securities |  |  | 5,694 |  |  | (11) |  |  | 5,694 |  |  | (11) |  |  | — |  |  | — |
Trust preferred securities |  |  | 1,307 |  |  | (269) |  |  | — |  |  | — |  |  | 1,307 |  |  | (269) |
Corporate bonds and notes |  |  | 1,961 |  |  | (11) |  |  | 1,961 |  |  | (11) |  |  | — |  |  | — |
Asset-backed securities |  |  | 9,773 |  |  | (31) |  |  | 9,773 |  |  | (31) |  |  | — |  |  | — |
Certificates of deposit |  |  | 369 |  |  | (2) |  |  | 369 |  |  | (2) |  |  | — |  |  | — |
Equity securities |  |  | 307 |  |  | (69) |  |  | — |  |  | — |  |  | 307 |  |  | (69) |
Other securities |  |  | 5,417 |  |  | (82) |  |  | 1,978 |  |  | (21) |  |  | 3,439 |  |  | (61) |
Total |  | $ | 31,583 |  | $ | (525) |  | $ | 22,545 |  | $ | (85) |  | $ | 9,038 |  | $ | (440) |
Investment Securities Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  |  | 3,228 |  |  | (28) |  |  | 3,228 |  |  | (28) |  |  | — |  |  | — |
Obligations of U.S. states and political subdivisions |  |  | 8,341 |  |  | (60) |  |  | 1,401 |  |  | (3) |  |  | 6,940 |  |  | (57) |
Corporate bonds and notes |  |  | 993 |  |  | (7) |  |  | 993 |  |  | (7) |  |  | — |  |  | — |
Total |  |  | 12,562 |  |  | (95) |  |  | 5,622 |  |  | (38) |  |  | 6,940 |  |  | (57) |
Total Temporarily Impaired Securities |  | $ | 44,145 |  | $ | (620) |  | $ | 28,167 |  | $ | (123) |  | $ | 15,978 |  | $ | (497)

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