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Securities (Tables)	12 Months Ended
Securities (Tables)	Dec. 31, 2020
Investments debt and equity securities [Abstract]
Available-for-sale Securities [Table Text Block]	1 year 1 to 5 5 to 10 After 10 Fair Gross Unrealized Amortized (Dollars in thousands) or less years years years Value Gains Losses Cost December 31, 2020 Agency obligations (a) $ 5,048 24,834 55,367 12,199 97,448 3,156 98 $ 94,390 Agency MBS (a) — 1,154 20,502 141,814 163,470 3,245 133 160,358 State and political subdivisions 477 632 8,405 64,745 74,259 3,988 11 70,282 Total available-for-sale $ 5,525 26,620 84,274 218,758 335,177 10,389 242 $ 325,030 December 31, 2019 Agency obligations (a) $ 4,993 27,245 18,470 — 50,708 215 98 $ 50,591 Agency MBS (a) — 560 4,510 118,207 123,277 798 261 $ 122,740 State and political subdivisions — 1,355 6,166 54,396 61,917 2,104 9 $ 59,822 Total available-for-sale $ 4,993 29,160 29,146 172,603 235,902 3,117 368 $ 233,153 (a) Includes securities issued by U.S. government agencies or government sponsored entities. Expected maturities of these securities may differ from contractual maturities because issues may have the right to call or repay obligations with or without prepayment penalties.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block]	Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) Value Losses Value Losses Value Losses December 31, 2020: Agency obligations $ 15,416 98 — — 15,416 $ 98 Agency MBS 41,488 133 — — 41,488 133 State and political subdivisions 2,945 11 — — 2,945 11 Total $ 59,849 242 — — 59,849 $ 242 December 31, 2019: Agency obligations $ 24,734 97 4,993 1 29,727 $ 98 Agency MBS 40,126 98 21,477 163 61,603 261 State and political subdivisions 2,741 9 — — 2,741 9 Total $ 67,601 204 26,470 164 94,071 $ 368
Schedule of Realized Gain (Loss) [Table Text Block]	Realized Gains and Losses The following table presents the gross realized gains and losses on sales related to securities. Year ended December 31 (Dollars in thousands) 2020 2019 Gross realized gains $ 184 120 Gross realized losses (81) (243) Realized gains (losses), net $ 103 (123)