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Securities (Tables)	12 Months Ended
	Dec. 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 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 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. Expected lives of these securities may differ from contractual maturities because issues may have the right to call or repay obligations with or without prepayment penalties.
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 December 31, 2022: Agency obligations  $ 55,931 4,161 69,687 11,665 125,618 $ 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 12,179 230,597 42,474 401,598 $ 54,653 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
Schedule of Realized Gain (Loss) [Table Text Block]	Realized Gains and Losses  The following table presents the gross realized gains and losses on sales related to securities. Year ended December 31 (Dollars in thousands) 2022 2021 Gross realized gains $ 48 15 Gross realized losses (36) — Realized gains, net $ 12 15

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Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

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