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Securities (Tables)	6 Months Ended
Securities (Tables)	Jun. 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 June 30, 2024 Agency obligations (a) $ — 17,309 35,407 — 52,716 — 8,501 $ 61,217 Agency MBS (a) 59 19,849 14,808 149,225 183,941 — 30,314 214,255 State and political subdivisions — 568 9,037 8,097 17,702 1 2,961 20,662 Total available-for-sale $ 59 37,726 59,252 157,322 254,359 1 41,776 $ 296,134 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 June 30, 2024: Agency obligations $ — — 52,716 8,501 $ 52,716 8,501 Agency MBS 10 — 183,931 30,314 183,941 30,314 State and political subdivisions 1,817 38 14,163 2,923 15,980 2,961 Total $ 1,827 38 250,810 41,738 $ 252,637 41,776 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