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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2015 and 2014.
|  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | 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
|  |  |  | 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 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
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  | December 31, 2014
|  | (dollars in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 32,650 |  | $ | 217 |  | $ | (50) |  | $ | 32,817
Residential mortgage pass-through securities |  |  | 58,836 |  |  | 1,531 |  |  | (11) |  |  | 60,356
Commercial mortgage pass-through securities |  |  | 3,042 |  |  | 4 |  |  | - |  |  | 3,046
Obligations of U.S. states and political subdivisions |  |  | 8,201 |  |  | 205 |  |  | - |  |  | 8,406
Trust preferred securities |  |  | 16,086 |  |  | 489 |  |  | (269) |  |  | 16,306
Corporate bonds and notes |  |  | 119,838 |  |  | 5,950 |  |  | (11) |  |  | 125,777
Asset-backed securities |  |  | 27,393 |  |  | 140 |  |  | (31) |  |  | 27,502
Certificates of deposit |  |  | 2,098 |  |  | 27 |  |  | (2) |  |  | 2,123
Equity securities |  |  | 376 |  |  | - |  |  | (69) |  |  | 307
Other securities |  |  | 12,941 |  |  | 33 |  |  | (82) |  |  | 12,892
Total securities available-for-sale |  | $ | 281,461 |  | $ | 8,596 |  | $ | (525) |  | $ | 289,532
|  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrecognized |  | Unrecognized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
Investment securities held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency securities |  | $ | 28,264 |  | $ | 920 |  | $ | - |  | $ | 29,184
Federal agency obligations |  |  | 27,103 |  |  | 322 |  |  | (28) |  |  | 27,397
Residential mortgage-backed securities |  |  | 5,955 |  |  | 28 |  |  | - |  |  | 5,983
Commercial mortgage-backed securities |  |  | 4,266 |  |  | 50 |  |  | - |  |  | 4,316
Obligations of U.S. states and political subdivisions |  |  | 120,144 |  |  | 4,512 |  |  | (60) |  |  | 124,596
Corporate bonds and notes |  |  | 38,950 |  |  | 1,026 |  |  | (7) |  |  | 39,969
Total securities held-to-maturity |  | $ | 224,682 |  | $ | 6,858 |  | $ | (95) |  | $ | 231,445
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale and held-to-maturity at December 31, 2015, 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, 2015
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |
Due in one year or less |  | $ | 13,543 |  | $ | 13,587
Due after one year through five years |  |  | 21,730 |  |  | 22,137
Due after five years through ten years |  |  | 44,371 |  |  | 44,391
Due after ten years |  |  | 49,160 |  |  | 49,249
Residential mortgage pass-through securities |  |  | 44,155 |  |  | 44,910
Commercial mortgage pass-through securities |  |  | 2,981 |  |  | 2,972
Equity securities |  |  | 376 |  |  | 374
Other securities |  |  | 18,303 |  |  | 18,150
Total |  | $ | 194,619 |  | $ | 195,770
Investment Securities Held-to-Maturity: |  |  |  |  |  |
Due in one year or less |  | $ | 1,000 |  | $ | 998
Due after one year through five years |  |  | 13,123 |  |  | 13,380
Due after five years through ten years |  |  | 80,274 |  |  | 82,739
Due after ten years |  |  | 121,744 |  |  | 125,496
Residential mortgage-backed securities |  |  | 3,805 |  |  | 3,810
Commercial mortgage-backed securities |  |  | 4,110 |  |  | 4,135
Total |  | $ | 224,056 |  | $ | 230,558
Total investment securities |  | $ | 418,675 |  | $ | 426,328
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, 2015, 2014 and 2013 were as follows:
|  | Years Ended December 31,
(dollars in thousands) |  | 2015 |  | 2014 |  | 2013
Proceeds |  | $ | 65,231 |  | $ | 81,844 |  | $ | 122,165
Gross gains on sales of investment securities |  | $ | 3,931 |  | $ | 2,837 |  | $ | 2,451
Gross losses on sales of investment securities |  |  | - |  |  | 19 |  |  | 88
Net gains on sales of investment securities |  |  | 3,931 |  |  | 2,818 |  |  | 2,363
Less: tax provision on net gains |  | (1,376) |  |  | (986) |  |  | (645)
Net gains on sales of investment securities |  | $ | 2,555 |  | $ | 1,832 |  | $ | 1,718
Schedule of OTTI Charges for period | Summary of Other-than-Temporary Impairment Charges
|  | Years Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (dollars in thousands)
Pooled trust preferred securities |  | $ | - |  | $ | - |  | $ | 628
Principal losses on a variable rate CMO |  |  | - |  |  | - |  |  | 24
Total other-than-temporary impairment charges |  | $ | - |  | $ | - |  | $ | 652
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, 2015 and 2014:
|  | 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)
|  | December 31, 2014
|  | 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 |  | $ | 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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