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Securities (Tables)	3 Months Ended
Securities (Tables)	Mar. 31, 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 March 31, 2023 Agency obligations (a) $ 5,300 59,997 61,883 — 127,180 — 13,574 $ 140,754 Agency MBS (a) — 6,984 27,601 181,114 215,699 — 29,522 245,221 State and political subdivisions 300 1,032 15,581 45,900 62,813 49 4,300 67,064 Total available-for-sale $ 5,600 68,013 105,065 227,014 405,692 49 47,396 $ 453,039 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 March 31, 2023: Agency obligations $ 18,263 950 108,917 12,624 $ 127,180 13,574 Agency MBS 23,127 1,047 192,572 28,475 215,699 29,522 State and political subdivisions 19,186 278 35,741 4,022 54,927 4,300 Total $ 60,576 2,275 337,230 45,121 $ 397,806 47,396 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