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Capital - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 17, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 23, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Minimum Common equity Tier 1 risk-based capital ratio |  | 6.50% |  |
Minimum Tier 1 risk based capital ratio to be categorized as well capitalized |  | 8.00 |  |
Minimum total risk based capital ratio to be categorized as well capitalized |  | 10.00 |  |
Minimum leverage capital ratio to be categorized as well capitalized |  | 5.00 |  |
Preferred stock par value |  | $ 0.01 | $ 0.01 |
Depositary Shares | Series A Noncumulative Preferred Stock |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Depositary shares issued | 20,600,000 |  |  |
Preferred stock par value | $ 0.01 |  |  |
Preferred stock, liquidation preference per share | 1,000 |  |  |
Depository shares, liquidation preference per share | $ 25 |  |  |
Fixed dividend rate per annum | 6.375% |  |  |
Floating dividend rate per annum | Three-month LIBOR plus 382.1 basis |  |  |
Dividends payable description | Dividends will be payable in arrears on March 17, June 17, September 17, and December 17 of each year, which commenced on June 17, 2017 |  |  |
Common Stock |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 300.0
Stock repurchase program, shares repurchased |  | 28,900,000 |  |
Treasury stock average price per share |  | $ 9.63 |  |
Treasury stock aggregate purchase price |  | $ 278.1 |  |
Stock repurchased during period, shares |  | 5,000,000.0 | 7,100,000 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 50,200,000 | 67,100,000 |

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