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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,988	$ 2,964
Gross Unrealized Gains	2	21
Gross Unrealized Losses		(1)
Estimated Fair Value	2,990	2,984
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	43	59
Gross Unrealized Gains	2	3
Estimated Fair Value	45	62
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,445	2,405
Gross Unrealized Gains		18
Gross Unrealized Losses		(1)
Estimated Fair Value	2,445	2,422
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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