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Capital - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 17, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 23, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Minimum leverage capital ratio to be categorized as well capitalized |  | 5.00% |  |
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 Common equity Tier 1 risk-based capital ratio |  | 6.50% |  |
Preferred stock par value |  | $ 0.01 | $ 0.01 |
Treasury Stock, Value |  | $ 220,717 | $ 161,998 |
Depositary Shares [Member] | Series A Noncumulative Preferred Stock [Member] |  |  |  |
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 [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 300,000
Treasury Stock, Value |  | $ 7,100 | $ 16,800 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 67,100,000 | 160,800,000 |

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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Describes the declaration as being a special dividend (over and above the normal dividend); as the annual, semi-annual, quarterly dividend, or other normal periodic dividend; or as some other type of dividend. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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