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Securities (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2022 Agency obligations (a) $ — 50,826 74,490 — 125,316 — 16,305 $ 141,621 Agency MBS (a) — 382 34,606 186,320 221,308 — 36,601 257,909 State and political subdivisions 170 924 16,243 47,577 64,914 7 8,093 73,000 Total available-for-sale $ 170 52,132 125,339 233,897 411,538 7 60,999 $ 472,530 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 September 30, 2022: Agency obligations  $ 64,689 5,097 60,627 11,208 $ 125,316 16,305 Agency MBS 117,411 14,777 103,897 21,824 221,308 36,601 State and political subdivisions 56,132 5,977 7,027 2,116 63,159 8,093 Total  $ 238,232 25,851 171,551 35,148 $ 409,783 60,999 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 of securities. Quarter ended September 30, Nine months ended September 30,  (Dollars in thousands) 2022 2021 2022 2021 Gross realized gains $ 44 15 $ 44 15 Realized gains, net $ 44 15 $ 44 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.

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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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