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Securities (Tables)	3 Months Ended
Securities (Tables)	Mar. 31, 2022
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, 2022 Agency obligations (a) $ — 49,185 66,866 — 116,051 — 7,428 $ 123,479 Agency MBS (a) — 570 34,857 198,400 233,827 62 14,906 248,671 State and political subdivisions 170 627 14,494 52,290 67,581 902 1,937 68,616 Total available-for-sale $ 170 50,382 116,217 250,690 417,459 964 24,271 $ 440,766 December 31, 2021 Agency obligations (a) $ 5,007 49,604 69,802 — 124,413 1,080 2,079 $ 125,412 Agency MBS (a) — 680 35,855 186,836 223,371 1,527 2,680 224,524 State and political subdivisions 170 647 15,743 57,547 74,107 3,611 270 70,766 Total available-for-sale $ 5,177 50,931 121,400 244,383 421,891 6,218 5,029 $ 420,702 (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, 2022: Agency obligations $ 78,527 3,404 37,525 4,024 $ 116,052 7,428 Agency MBS 173,957 9,964 52,473 4,942 226,430 14,906 State and political subdivisions 23,712 1,484 3,556 453 27,268 1,937 Total $ 276,196 14,852 93,554 9,419 $ 369,750 24,271 December 31, 2021: Agency obligations $ 49,799 1,025 26,412 1,054 $ 76,211 2,079 Agency MBS 130,110 1,555 38,611 1,125 168,721 2,680 State and political subdivisions 7,960 109 3,114 161 11,074 270 Total $ 187,869 2,689 68,137 2,340 $ 256,006 5,029