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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
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 as of December 31, 2021 and 2020.
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (dollars in thousands) |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 50,336 |  |  | $ | 649 |  |  | $ | (625 | ) |  | $ | 50,360 |
Residential mortgage pass-through securities |  |  | 317,111 |  |  |  | 1,868 |  |  |  | (2,884 | ) |  |  | 316,095 |
Commercial mortgage pass-through securities |  |  | 10,814 |  |  |  | 118 |  |  |  | (463 | ) |  |  | 10,469 |
Obligations of U.S. states and political subdivisions​​ |  |  | 145,045 |  |  |  | 1,562 |  |  |  | (982 | ) |  |  | 145,625 |
Corporate bonds and notes |  |  | 8,968 |  |  |  | 81 |  |  |  | - |  |  |  | 9,049 |
Asset-backed securities |  |  | 2,563 |  |  |  | 3 |  |  |  | (2 | ) |  |  | 2,564 |
Certificates of deposit |  |  | 150 |  |  |  | - |  |  |  | - |  |  |  | 150 |
Other securities |  |  | 195 |  |  |  | - |  |  |  | - |  |  |  | 195 |
Total securities available-for-sale |  | $ | 535,182 |  |  | $ | 4,281 |  |  | $ | (4,956 | ) |  | $ | 534,507 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (dollars in thousands) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 37,015 |  |  | $ | 1,508 |  |  | $ | (65 | ) |  | $ | 38,458 |
Residential mortgage pass-through securities |  |  | 266,114 |  |  |  | 4,811 |  |  |  | (41 | ) |  |  | 270,884 |
Commercial mortgage pass-through securities |  |  | 6,906 |  |  |  | 203 |  |  |  | (187 | ) |  |  | 6,922 |
Obligations of U.S. states and political subdivisions​​ |  |  | 138,539 |  |  |  | 4,269 |  |  |  | - |  |  |  | 142,808 |
Corporate bonds and notes |  |  | 24,925 |  |  |  | 222 |  |  |  | (52 | ) |  |  | 25,095 |
Asset-backed securities |  |  | 3,521 |  |  |  | - |  |  |  | (41 | ) |  |  | 3,480 |
Certificates of deposit |  |  | 149 |  |  |  | 2 |  |  |  | - |  |  |  | 151 |
Other securities |  |  | 157 |  |  |  | - |  |  |  | - |  |  |  | 157 |
Total securities available-for-sale |  | $ | 477,326 |  |  | $ | 11,015 |  |  | $ | (386 | ) |  | $ | 487,955 |
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale as of December 31, 2021, 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, 2021 |
|  | Amortized Cost |  |  | Fair Value |
|  | (dollars in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 3,045 |  |  | $ | 3,051 |
Due after one year through five years |  |  | 10,203 |  |  |  | 10,280 |
Due after five years through ten years |  |  | 5,136 |  |  |  | 5,338 |
Due after ten years |  |  | 188,678 |  |  |  | 189,079 |
Residential mortgage pass-through securities |  |  | 317,111 |  |  |  | 316,095 |
Commercial mortgage pass-through securities |  |  | 10,814 |  |  |  | 10,469 |
Other securities |  |  | 195 |  |  |  | 195 |
Total securities available-for-sale |  | $ | 535,182 |  |  | $ | 534,507 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales and redemptions of investment securities for the years ended December 31, 2021, 2020 and 2019 were as follows:
|  | Years Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (dollars in thousands) |
Proceeds |  | $ | 5,185 |  |  | $ | 19,624 |  |  | $ | 183,728 |
Gross gains on sales/redemptions of investment securities |  | $ | 195 |  |  | $ | 29 |  |  | $ | 401 |
Gross losses on sales/redemptions of investment securities |  |  | - |  |  |  | - |  |  |  | (681 | )
Net gains (losses) on sales/redemptions of investment securities​​ |  |  | 195 |  |  |  | 29 |  |  |  | (280 | )
Tax provision on net gains |  |  | (48 | ) |  |  | (6 | ) |  |  | 79 |
Net gains (losses) on sales/redemptions of investment securities, after tax​​ |  | $ | 147 |  |  | $ | 23 |  |  | $ | (201 | )
Schedule of Unrealized Loss on Investments [Table Text Block] | The following tables indicate gross unrealized losses for which an ACL has not been recorded, aggregated by investment category and by the length of continuous time individual securities have been in an unrealized loss position as of December 31, 2021 and December 31, 2020.
|  | December 31, 2021 |
|  | 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 |  | $ | 28,974 |  |  | $ | (625 | ) |  | $ | 28,974 |  |  | $ | (625 | ) |  | $ | - |  |  | $ | - |
Residential mortgage pass-through securities |  |  | 246,396 |  |  |  | (2,884 | ) |  |  | 214,701 |  |  |  | (2,111 | ) |  |  | 31,695 |  |  |  | (773 | )
Commercial mortgage pass-through securities |  |  | 8,370 |  |  |  | (463 | ) |  |  | 4,682 |  |  |  | (75 | ) |  |  | 3,688 |  |  |  | (388 | )
Obligations of U.S. states and political subdivisions |  |  | 89,473 |  |  |  | (982 | ) |  |  | 89,473 |  |  |  | (982 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 802 |  |  |  | (2 | ) |  |  | 802 |  |  |  | (2 | ) |  |  | - |  |  |  | - |
Total Temporarily Impaired Securities |  | $ | 374,015 |  |  | $ | (4,956 | ) |  | $ | 338,632 |  |  | $ | (3,795 | ) |  | $ | 35,383 |  |  | $ | (1,161 | )
|  | December 31, 2020 |
|  | 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 |  | $ | 8,978 |  |  | $ | (65 | ) |  | $ | 8,975 |  |  | $ | (65 | ) |  | $ | 3 |  |  | $ | - |
Residential mortgage pass-through securities |  |  | 20,895 |  |  |  | (41 | ) |  |  | 20,886 |  |  |  | (41 | ) |  |  | 9 |  |  |  | - |
Commercial mortgage pass-through securities |  |  | 3,954 |  |  |  | (187 | ) |  |  | 3,954 |  |  |  | (187 | ) |  |  | - |  |  |  | - |
Corporate bonds and notes |  |  | 3,928 |  |  |  | (52 | ) |  |  | 3,928 |  |  |  | (52 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 3,083 |  |  |  | (41 | ) |  |  | 622 |  |  |  | - |  |  |  | 2,461 |  |  |  | (41 | )
Total Temporarily Impaired Securities |  | $ | 40,838 |  |  | $ | (386 | ) |  | $ | 38,365 |  |  | $ | (345 | ) |  | $ | 2,473 |  |  | $ | (41 | )

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