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Securities (Tables)	3 Months Ended
Securities (Tables)	Mar. 31, 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 March 31, 2024 Agency obligations (a) $ — 14,416 38,335 — 52,751 — 8,554 $ 61,305 Agency MBS (a) 57 15,533 20,254 154,380 190,224 — 30,229 220,453 State and political subdivisions — 569 9,067 8,159 17,795 — 2,898 20,693 Total available-for-sale $ 57 30,518 67,656 162,539 260,770 — 41,681 $ 302,451 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 March 31, 2024: Agency obligations $ — — 52,751 8,554 $ 52,751 8,554 Agency MBS 15 — 190,209 30,229 190,224 30,229 State and political subdivisions 1,459 6 15,010 2,892 16,469 2,898 Total $ 1,474 6 257,970 41,675 $ 259,444 41,681 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