Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)

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Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 35.00%
State taxes, net of federal tax benefits 9.39% 9.50% 6.64%
Tax-exempt municipal securities (0.29%) (0.16%) (0.24%)
Tax credit - federal (3.49%) (2.37%) (2.37%)
Federal rate adjustment, net of federal benefits of state   1.32% 4.18%
Low income housing amortization 4.17% 2.40% 2.52%
Other (0.03%) (0.60%) (3.10%)
Effective tax rate 30.75% 31.09% 42.63%