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Securities (Tables)	12 Months Ended
	Dec. 31, 2021
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, 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 December 31, 2020 Agency obligations (a) $ 5,048 24,834 55,367 12,199 97,448 3,156 98 $ 94,390 Agency MBS (a) — 1,154 20,502 141,814 163,470 3,245 133 160,358 State and political subdivisions 477 632 8,405 64,745 74,259 3,988 11 70,282 Total available-for-sale $ 5,525 26,620 84,274 218,758 335,177 10,389 242 $ 325,030 (a) Includes securities issued by U.S. government agencies or government sponsored entities. Expected maturities 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, 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 December 31, 2020: Agency obligations  $ 15,416 98 — — 15,416 $ 98 Agency MBS 41,488 133 — — 41,488 133 State and political subdivisions 2,945 11 — — 2,945 11 Total  $ 59,849 242 — — 59,849 $ 242
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) 2021 2020 Gross realized gains $ 15 184 Gross realized losses — (81) Realized gains, net $ 15 103

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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