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Securities Available-for-Sale (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following table summarizes the amortized cost and fair value of securities available-for-sale at June 30, 2019 and December 31, 2018 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss).
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
June 30, 2019 |  | (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 24,877 |  | $ | 599 |  | $ | (15 | ) |  | $ | 25,461
Residential mortgage pass-through securities |  |  | 230,064 |  |  | 881 |  |  | (1,403 | ) |  |  | 229,542
Commercial mortgage pass-through securities |  |  | 5,748 |  |  | 78 |  |  | - |  |  |  | 5,826
Obligations of U.S. states and political subdivisions |  |  | 142,521 |  |  | 2,417 |  |  | (819 | ) |  |  | 144,119
Corporate bonds and notes |  |  | 28,128 |  |  | 267 |  |  | (278 | ) |  |  | 28,117
Asset-backed securities |  |  | 7,802 |  |  | 2 |  |  | (58 | ) |  |  | 7,746
Certificates of deposit |  |  | 148 |  |  | 2 |  |  | - |  |  |  | 150
Other securities |  |  | 950 |  |  | - |  |  | - |  |  |  | 950
Total securities available-for-sale |  | $ | 440,238 |  | $ | 4,246 |  | $ | (2,573 | ) |  | $ | 441,911
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
December 31, 2018 |  | (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 45,509 |  | $ | 51 |  | $ | (605 | ) |  | $ | 44,955
Residential mortgage pass-through securities |  |  | 189,721 |  |  | 85 |  |  | (4,602 | ) |  |  | 185,204
Commercial mortgage pass-through securities |  |  | 3,919 |  |  | - |  |  | (45 | ) |  |  | 3,874
Obligations of U.S. states and political subdivisions |  |  | 141,496 |  |  | 1,091 |  |  | (3,402 | ) |  |  | 139,185
Corporate bonds and notes |  |  | 26,308 |  |  | 45 |  |  | (540 | ) |  |  | 25,813
Asset-backed securities |  |  | 9,685 |  |  | 22 |  |  | (16 | ) |  |  | 9,691
Certificates of deposit |  |  | 319 |  |  | 3 |  |  | - |  |  |  | 322
Other securities |  |  | 2,990 |  |  | - |  |  | - |  |  |  | 2,990
Total securities available-for-sale |  | $ | 419,947 |  | $ | 1,297 |  | $ | (9,210 | ) |  | $ | 412,034
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale at June 30, 2019, 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.
|  | June 30, 2019
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |
Due in one year or less |  | $ | 4,166 |  | $ | 4,192
Due after one year through five years |  |  | 29,411 |  |  | 29,449
Due after five years through ten years |  |  | 22,538 |  |  | 23,126
Due after ten years |  |  | 147,361 |  |  | 148,826
Residential mortgage pass-through securities |  |  | 230,064 |  |  | 229,542
Commercial mortgage pass-through securities |  |  | 5,748 |  |  | 5,826
Other securities |  |  | 950 |  |  | 950
Total securities available-for-sale |  | $ | 440,238 |  | $ | 441,911
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales of securities for periods presented were as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | (dollars in thousands)
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Proceeds |  | $ | 47,664 |  |  | $ | - |  | $ | 141,739 |  |  | $ | -
Gross gains on sales of securities |  |  | 263 |  |  |  | - |  |  | 400 |  |  |  | -
Gross losses on sales of securities |  |  | (272 | ) |  |  | - |  |  | (401 | ) |  |  | -
Net losses on sales of securities |  |  | (9 | ) |  |  | - |  |  | (1 | ) |  |  | -
Less: tax provision on net losses |  |  | (2 | ) |  |  | - |  |  | - |  |  |  | -
Net losses on sales of securities, after tax |  | $ | (7 | ) |  | $ | - |  | $ | (1 | ) |  | $ | -
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 June 30, 2019 and December 31, 2018:
|  | June 30, 2019
|  | 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 |  | $ | 4,260 |  | $ | (15 | ) |  | $ | - |  | $ | - |  |  | $ | 4,260 |  | $ | (15 | )
Residential mortgage pass-through securities |  |  | 147,392 |  |  | (1,403 | ) |  |  | 42,750 |  |  | (73 | ) |  |  | 104,642 |  |  | (1,330 | )
Obligations of U.S. states and political subdivisions |  |  | 41,825 |  |  | (819 | ) |  |  | - |  |  | - |  |  |  | 41,825 |  |  | (819 | )
Corporate bonds and notes |  |  | 8,696 |  |  | (278 | ) |  |  | 2,000 |  |  | - |  |  |  | 6,696 |  |  | (278 | )
Asset-backed securities |  |  | 6,397 |  |  | (58 | ) |  |  | 4,406 |  |  | (47 | ) |  |  | 1,991 |  |  | (11 | )
Total temporarily impaired securities |  | $ | 208,570 |  | $ | (2,573 | ) |  | $ | 49,156 |  | $ | (120 | ) |  | $ | 159,414 |  | $ | (2,453 | )
|  | December 31, 2018
|  | 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 |  | $ | 35,472 |  | $ | (605 | ) |  | $ | 810 |  | $ | (1 | ) |  | $ | 34,662 |  | $ | (604 | )
Residential mortgage pass-through securities |  |  | 178,365 |  |  | (4,602 | ) |  |  | 42,040 |  |  | (393 | ) |  |  | 136,325 |  |  | (4,209 | )
Commercial mortgage pass-through securities |  |  | 3,874 |  |  | (45 | ) |  |  | - |  |  | - |  |  |  | 3,874 |  |  | (45 | )
Obligations of U.S. states and political subdivisions |  |  | 64,367 |  |  | (3,402 | ) |  |  | 7,765 |  |  | (21 | ) |  |  | 56,602 |  |  | (3,381 | )
Corporate bonds and notes |  |  | 15,534 |  |  | (540 | ) |  |  | 7,767 |  |  | (133 | ) |  |  | 7,767 |  |  | (407 | )
Asset-backed securities |  |  | 3,957 |  |  | (16 | ) |  |  | 2,219 |  |  | (11 | ) |  |  | 1,738 |  |  | (5 | )
Total Temporarily Impaired Securities |  | $ | 301,569 |  | $ | (9,210 | ) |  | $ | 60,601 |  | $ | (559 | ) |  | $ | 240,968 |  | $ | (8,651 | )

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