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Securities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2021 Agency obligations (a) $ 10,074 34,524 61,743 5,146 111,487 2,023 999 $ 110,463 Agency MBS (a) — 894 27,601 170,354 198,849 2,166 1,283 197,966 State and political subdivisions 381 982 11,874 61,292 74,529 3,945 170 70,754 Total available-for-sale $ 10,455 36,400 101,218 236,792 384,865 8,134 2,452 $ 379,183 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.
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 June 30, 2021: Agency obligations  $ 51,045 999 — — $ 51,045 999 Agency MBS 101,319 1,283 — — 101,319 1,283 State and political subdivisions 8,367 170 — — 8,367 170 Total  $ 160,731 2,452 — — $ 160,731 2,452 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 of securities. Quarter ended June 30, Six months ended June 30,  (Dollars in thousands) 2021 2020 2021 2020 Gross realized gains $ — 100 $ — 106 Gross realized losses — (19) — (19) Realized gains, net $ — 81 $ — 87

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Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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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=121645371&loc=d3e27357-111563

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