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Summary of Significant Accounting Policies - Summary of Bank's Actual Capital Amounts and Ratios, and the Regulatory Minimum Ratios (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounting Policies [Abstract] |  |
Regulatory, Minimum, Common equity tier 1 capital | $ 0 |
Regulatory, Minimum, Tier 1 capital | 0 |
Regulatory, Minimum, Total capital | 0 |
Regulatory, Minimum, Average assets | 0 |
Regulatory, Minimum, Risk-weighted assets | $ 0 |
Regulatory, Minimum, Leverage ratio | 4.0 |
Regulatory, Minimum, Common equity tier 1 capital ratio | 7.00% |
Regulatory, Minimum, Tier 1 capital ratio | 8.5 |
Regulatory, Minimum, Total capital ratio | 10.5 |
Regulatory, Well-Capitalized, Common equity tier 1 capital | $ 0 |
Regulatory, Well-Capitalized, Tier 1 capital | 0 |
Regulatory, Well-Capitalized, Total capital | 0 |
Regulatory, Well-Capitalized, Average assets | 0 |
Regulatory, Well-Capitalized, Risk-weighted assets | $ 0 |
Regulatory, Well-Capitalized, Leverage ratio | 5.0 |
Regulatory, Well-Capitalized, Common equity tier 1 capital ratio | 6.50% |
Regulatory, Well-Capitalized, Tier 1 capital ratio | 8.0 |
Regulatory, Well-Capitalized, Total capital ratio | 10.0 |
Common equity tier 1 capital | $ 148,507 | $ 158,187
Tier 1 capital | 217,295 | 226,975
Total capital | 233,460 | 241,842
Average assets | 1,283,664 | 1,172,866
Risk-weighted assets | $ 1,243,783 | $ 1,144,337
Leverage ratio | 16.9 | 19.4
Common equity Tier 1 capital ratio | 11.9 | 13.8
Tier 1 capital ratio | 17.5 | 19.8
Total capital ratio | 18.8 | 21.1

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