Investment Securities (Tables)	9 Months Ended
Sep. 30, 2021
Investment Securities [Abstract]
Amortized Cost and Fair Value of Investment Securities	Gross Gross Amortized unrealized unrealized Fair(dollars in thousands) cost gains losses valueSeptember 30, 2021 Available-for-sale debt securities: Agency - GSE $ 112,949 $ 386 $ (1,820) $ 111,515Obligations of states and political subdivisions 335,011 5,527 (4,073) 336,465MBS - GSE residential 238,745 2,402 (2,201) 238,946 Total available-for-sale debt securities $ 686,705 $ 8,315 $ (8,094) $ 686,926 Gross Gross Amortized unrealized unrealized Fair(dollars in thousands) cost gains losses valueDecember 31, 2020 Available-for-sale debt securities: Agency - GSE $ 45,146 $ 392 $ (91) $ 45,447Obligations of states and political subdivisions 192,385 7,480 (152) 199,713MBS - GSE residential 143,557 3,881 (178) 147,260 Total available-for-sale debt securities $ 381,088 $ 11,753 $ (421) $ 392,420
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Date	Amortized Fair(dollars in thousands) cost valueAvailable-for-sale securities: Debt securities: Due in one year or less $ 985 $ 1,008Due after one year through five years 9,207 9,452Due after five years through ten years 109,420 107,939Due after ten years 328,348 329,581 MBS - GSE residential 238,745 238,946 Total available-for-sale debt securities $ 686,705 $ 686,926
Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value	Less than 12 months More than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized(dollars in thousands) value losses value losses value losses September 30, 2021 Agency - GSE $ 87,844 $ (1,820) $ - $ - $ 87,844 $ (1,820)Obligations of states and political subdivisions 204,710 (3,882) 4,498 (191) 209,208 (4,073)MBS - GSE residential 160,399 (2,201) - - 160,399 (2,201)Total $ 452,953 $ (7,903) $ 4,498 $ (191) $ 457,451 $ (8,094)Number of securities 220 5 225 December 31, 2020 Agency - GSE $ 27,602 $ (91) $ - $ - $ 27,602 $ (91)Obligations of states and political subdivisions 15,256 (152) - - 15,256 (152)MBS - GSE residential 14,753 (178) - - 14,753 (178)Total $ 57,611 $ (421) $ - $ - $ 57,611 $ (421)Number of securities 30 - 30

Investment Securities (Tables)

9 Months Ended

Sep. 30, 2021

Amortized Cost and Fair Value of Investment Securities

Gross Gross Amortized unrealized unrealized Fair(dollars in thousands) cost gains losses valueSeptember 30, 2021 Available-for-sale debt securities: Agency - GSE $ 112,949 $ 386 $ (1,820) $ 111,515Obligations of states and political subdivisions 335,011 5,527 (4,073) 336,465MBS - GSE residential 238,745 2,402 (2,201) 238,946 Total available-for-sale debt securities $ 686,705 $ 8,315 $ (8,094) $ 686,926 Gross Gross Amortized unrealized unrealized Fair(dollars in thousands) cost gains losses valueDecember 31, 2020 Available-for-sale debt securities: Agency - GSE $ 45,146 $ 392 $ (91) $ 45,447Obligations of states and political subdivisions 192,385 7,480 (152) 199,713MBS - GSE residential 143,557 3,881 (178) 147,260 Total available-for-sale debt securities $ 381,088 $ 11,753 $ (421) $ 392,420

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Date

Amortized Fair(dollars in thousands) cost valueAvailable-for-sale securities: Debt securities: Due in one year or less $ 985 $ 1,008Due after one year through five years 9,207 9,452Due after five years through ten years 109,420 107,939Due after ten years 328,348 329,581 MBS - GSE residential 238,745 238,946 Total available-for-sale debt securities $ 686,705 $ 686,926

Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value

Less than 12 months More than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized(dollars in thousands) value losses value losses value losses September 30, 2021 Agency - GSE $ 87,844 $ (1,820) $ - $ - $ 87,844 $ (1,820)Obligations of states and political subdivisions 204,710 (3,882) 4,498 (191) 209,208 (4,073)MBS - GSE residential 160,399 (2,201) - - 160,399 (2,201)Total $ 452,953 $ (7,903) $ 4,498 $ (191) $ 457,451 $ (8,094)Number of securities 220 5 225 December 31, 2020 Agency - GSE $ 27,602 $ (91) $ - $ - $ 27,602 $ (91)Obligations of states and political subdivisions 15,256 (152) - - 15,256 (152)MBS - GSE residential 14,753 (178) - - 14,753 (178)Total $ 57,611 $ (421) $ - $ - $ 57,611 $ (421)Number of securities 30 - 30