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Securities - Amortized cost and estimated fair value of debt securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale, 1 year or less | $ 2,758 | $ 3,594
Total available-for-sale, 1 to 5 years | 56,435 | 57,526
Total available-for-sale, 5 to 10 years | 33,195 | 18,368
Total available-for-sale, After 10 years | 4,606 | 2,132
Total available-for-sale, Fair value | 96,994 | 81,620
Total available-for-sale, Gross unrealized gains | 1,494 | 2,090
Total available-for-sale, Gross unrealized losses | (619) | (123)
Total available-for-sale, Amortized cost | 96,119 | 79,653
U.S. government agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale, 1 year or less |  | 1,000
Total available-for-sale, 1 to 5 years | 3,938 | 4,862
Total available-for-sale, 5 to 10 years | 6,507 | 1,285
Total available-for-sale, Fair value | 10,445 | 7,147
Total available-for-sale, Gross unrealized gains | 163 | 154
Total available-for-sale, Gross unrealized losses | (39) | (17)
Total available-for-sale, Amortized cost | 10,321 | 7,010
Municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale, 1 year or less | 1,231 | 768
Total available-for-sale, 1 to 5 years | 3,777 | 3,726
Total available-for-sale, 5 to 10 years | 2,867 | 4,354
Total available-for-sale, After 10 years | 2,970 | 2,132
Total available-for-sale, Fair value | 10,845 | 10,980
Total available-for-sale, Gross unrealized gains | 464 | 518
Total available-for-sale, Gross unrealized losses | (12) | (18)
Total available-for-sale, Amortized cost | 10,393 | 10,480
Mortgage-backed residential obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale, 1 year or less | 456 | 1,443
Total available-for-sale, 1 to 5 years | 31,185 | 34,486
Total available-for-sale, 5 to 10 years | 13,837 | 7,165
Total available-for-sale, Fair value | 45,478 | 43,094
Total available-for-sale, Gross unrealized gains | 426 | 884
Total available-for-sale, Gross unrealized losses | (309) | (22)
Total available-for-sale, Amortized cost | 45,361 | 42,232
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale, 1 year or less | 1,071 | 383
Total available-for-sale, 1 to 5 years | 17,535 | 14,452
Total available-for-sale, 5 to 10 years | 9,984 | 5,564
Total available-for-sale, After 10 years | 1,636 |
Total available-for-sale, Fair value | 30,226 | 20,399
Total available-for-sale, Gross unrealized gains | 441 | 534
Total available-for-sale, Gross unrealized losses | (259) | (66)
Total available-for-sale, Amortized cost | $ 30,044 | $ 19,931

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