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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 12,236 | $ 38,416
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 41 | 138
Available-for-sale Securities, 12 Months or Longer, Fair Value | 14,898 | 35,402
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 642 | 628
Available-for-sale Securities, Fair Value, Total | 27,134 | 73,818
Available-for-sale Securities, Unrealized Losses, Total | 683 | 766
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 119 | 1,016
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 1 | 5
Held-to-maturity Securities, 12 Months or Longer, Fair Value |  | 3
Held-to-maturity Securities, Fair Value, Total | 119 | 1,019
Held-to-maturity Securities, Unrealized Losses, Total | 1 | 5
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 12,236 | 10,362
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 41 | 19
Available-for-sale Securities, 12 Months or Longer, Fair Value | 2,184 | 2,700
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 19 | 19
Available-for-sale Securities, Fair Value, Total | 14,420 | 13,062
Available-for-sale Securities, Unrealized Losses, Total | 60 | 38
Asset backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 12,714 | 12,714
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 623 | 606
Available-for-sale Securities, Fair Value, Total | 12,714 | 12,714
Available-for-sale Securities, Unrealized Losses, Total | 623 | 606
U.S. Treasuries [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 8,999
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 10
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | 19,988
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | 3
Available-for-sale Securities, Fair Value, Total |  | 28,987
Available-for-sale Securities, Unrealized Losses, Total |  | 13
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 15,165
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 64
Available-for-sale Securities, Fair Value, Total |  | 15,165
Available-for-sale Securities, Unrealized Losses, Total |  | 64
Held for Investment |  |
Held-to-maturity Securities, 12 Months or Longer, Fair Value |  | 3
Held-to-maturity Securities, Fair Value, Total |  | 3
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 3,890
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 45
Available-for-sale Securities, Fair Value, Total |  | 3,890
Available-for-sale Securities, Unrealized Losses, Total |  | 45
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 119 | 1,016
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 1 | 5
Held-to-maturity Securities, Fair Value, Total | 119 | 1,016
Held-to-maturity Securities, Unrealized Losses, Total | $ 1 | $ 5

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