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Securities (Tables)	9 Months Ended
Securities (Tables)	Sep. 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 September 30, 2023 Agency obligations (a) $ 15,063 49,036 58,651 — 122,750 — 17,152 $ 139,902 Agency MBS (a) — 10,095 26,845 155,517 192,457 — 39,581 232,038 State and political subdivisions 300 981 15,488 41,310 58,079 — 8,717 66,796 Total available-for-sale $ 15,363 60,112 100,984 196,827 373,286 — 65,450 $ 438,736 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 September 30, 2023: Agency obligations $ — — 122,750 17,152 $ 122,750 17,152 Agency MBS 84 3 192,373 39,578 192,457 39,581 State and political subdivisions 12,726 755 44,313 7,962 57,039 8,717 Total $ 12,810 758 359,436 64,692 $ 372,246 65,450 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
Schedule of Realized Gain (Loss) [Table Text Block]	Realized Gains and Losses The following table presents the gross realized gains and losses on sales of securities. Quarter ended September 30, Nine months ended September 30, (Dollars in thousands) 2023 2022 2023 2022 Gross realized gains $ — 44 $ — 44 Realized gains, net $ — 44 $ — 44