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Securities (Tables)	6 Months Ended
Securities (Tables)	Jun. 30, 2023
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, 2023 Agency obligations (a) $ 5,306 59,203 60,643 — 125,152 — 15,422 $ 140,574 Agency MBS (a) — 6,687 31,155 169,138 206,980 — 31,769 238,749 State and political subdivisions 300 1,014 15,354 45,279 61,947 14 4,998 66,931 Total available-for-sale $ 5,606 66,904 107,152 214,417 394,079 14 52,189 $ 446,254 December 31, 2022 Agency obligations (a) $ 4,935 50,746 69,936 — 125,617 — 15,826 $ 141,443 Agency MBS (a) — 7,130 27,153 183,877 218,160 — 33,146 251,306 State and political subdivisions 300 642 15,130 45,455 61,527 11 5,681 67,197 Total available-for-sale $ 5,235 58,518 112,219 229,332 405,304 11 54,653 $ 459,946 (a) Includes securities issued by U.S. government agencies or government-sponsored entities.
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, 2023: Agency obligations $ 17,994 1,243 107,158 14,179 $ 125,152 15,422 Agency MBS 22,246 1,332 184,734 30,437 206,980 31,769 State and political subdivisions 17,358 330 39,727 4,668 57,085 4,998 Total $ 57,598 2,905 331,619 49,284 $ 389,217 52,189 December 31, 2022: Agency obligations $ 55,931 4,161 69,686 11,665 $ 125,617 15,826 Agency MBS 70,293 5,842 147,867 27,304 218,160 33,146 State and political subdivisions 44,777 2,176 13,043 3,505 57,820 5,681 Total $ 171,001 12,179 230,596 42,474 $ 401,597 54,653