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Securities (Tables)	9 Months Ended
Securities (Tables)	Sep. 30, 2024
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 September 30, 2024 Agency obligations (a) $ — 22,691 31,386 — 54,077 — 6,157 $ 60,234 Agency MBS (a) 30 20,345 16,191 149,288 185,854 — 22,204 208,058 State and political subdivisions — 589 9,735 8,030 18,354 1 2,282 20,635 Total available-for-sale $ 30 43,625 57,312 157,318 258,285 1 30,643 $ 288,927 December 31, 2023 Agency obligations (a) $ 331 10,339 43,209 — 53,879 — 8,195 $ 62,074 Agency MBS (a) 32 15,109 22,090 161,058 198,289 — 27,838 226,127 State and political subdivisions — — 9,691 9,051 18,742 1 2,731 21,472 Total available-for-sale $ 363 25,448 74,990 170,109 270,910 1 38,764 $ 309,673 (a) Includes securities issued by U.S. government agencies or government -sponsored entities. Expected lives of these securities may differ from contractual maturities because (i) issuers may have the right to call or repay such securities obligations with or without prepayment penalties and (ii) loans incuded in Agency MBS generally have the right to prepay such loan in whole or in part at any time.
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 September 30, 2024: Agency obligations $ — — 54,077 6,157 $ 54,077 6,157 Agency MBS — — 185,837 22,204 185,837 22,204 State and political subdivisions 621 4 14,782 2,278 15,403 2,282 Total $ 621 4 254,696 30,639 $ 255,317 30,643 December 31, 2023: Agency obligations $ — — 53,879 8,195 $ 53,879 8,195 Agency MBS 66 1 198,223 27,837 198,289 27,838 State and political subdivisions 793 2 14,408 2,729 15,201 2,731 Total $ 859 3 266,510 38,761 $ 267,369 38,764