Annual report pursuant to Section 13 and 15(d)

Qualified Affordable Housing Project Investments - Additional Information (Detail)

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Qualified Affordable Housing Project Investments - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
Investments in Affordable Housing Projects [Line Items]  
Qualified affordable housing project investments $ 9,600,000
Unfunded commitments related to investments $ 112,000
Investment commitments expected to be paid 2023
Income Tax Expense  
Investments in Affordable Housing Projects [Line Items]  
Qualified affordable housing project investments, amortization expense recognized $ 2,000,000.0