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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Maturity period of highly liquid debt instruments |  | Three months or less |  |
Available-for-sale securities transferred to held-to-maturity securities | $ 536,000,000 |  |  | $ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross | $ 13,300,000 |  |  | $ 13,300,000
Loans past due, minimum period |  | 90 days |  |
Non-accrual business and commercial real estate loans |  | $ 250,000 |  |
Delinquency period of losses on mortgage loan to be deemed uncollectible |  | 120 days |  |
Allowance for loan losses |  | $ 0 |  |
Mortgage loans sold on real estate, final maturity period |  | 15 years |  |
Delinquency period of mortgage loans |  | 90 days |  |
Share-based compensation, excess tax benefit, amount |  |  | $ 1,800,000 |
Computer Equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated depreciable life of assets |  | 3 years |  |
Furniture, Fixtures and Other Electronic Equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated depreciable life of assets |  | 5 years |  |
Building Improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated depreciable life of assets |  | 10 years |  |
Buildings |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated depreciable life of assets |  | 30 years |  |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity reclassification |  |  | $ 147,000 |
Minimum | Accounting Standards Update 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease, liability |  | $ 18,000,000 |  |
Operating lease, right-of-use asset |  | 18,000,000 |  |
Maximum | Accounting Standards Update 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease, liability |  | 22,000,000 |  |
Operating lease, right-of-use asset |  | $ 22,000,000 |  |

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- Definition Minimum Amount Of Nonaccrual Business And Commercial Real Estate Loans Evaluated Individually For Impairment + References No definition available. + Details
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