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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) Unit
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Maximum refinement period of fair values after closing date of acquisition |  |  | 1 year
Allowance for loan losses |  | $ 0 | $ 0
Loan minimum balance included in specific reserve analysis |  |  | $ 1,000,000
Number of reporting units | Unit |  |  | 1
Tax credit carry back period |  |  | 1 year
Tax credit carry forward period |  |  | 20 years
Operating Lease, Right-of-Use Asset |  | 110,023,000 | $ 110,023,000
Operating Lease, Liability |  | 127,703,000 | 127,703,000
Reserve for unfunded lending commitments |  | 3,974,000 | 3,974,000
Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Operating Lease, Right-of-Use Asset |  | $ 116,300,000 | $ 116,300,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | us-gaap:Assets | us-gaap:Assets
Operating Lease, Liability |  | $ 131,100,000 | $ 131,100,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  | us-gaap:Liabilities | us-gaap:Liabilities
Deferred rent liabilities |  | $ 14,800,000 | $ 14,800,000
Accounting Standards Update 2019-04 [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Transfer securities with amortized cost from its held to maturity portfolio to its available for sale portfolio |  | $ 1,200,000,000 | $ 1,200,000,000
Accounting Standards Update 2016-13 [Member] | Subsequent Event [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Increase in allowance for credit losses | $ 76,700,000 |  |
Increases in ALLL | 49,400,000 |  |
Reserve for unfunded lending commitments | 27,300,000 |  |
Increase of ALLL reclassified from fair value mark for acquired impaired loans considered purchased credit deteriorated | 19,800,000 |  |
Cumulative-effect adjustment to retained earnings(net of tax) | $ 44,100,000 |  |
Federal NMTC Investment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Tax credit earning period |  |  | 7 years
Low Income Housing Credit Investments [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Tax credit earning period |  |  | 10 years
Buildings [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Estimated useful lives of assets |  |  | 30 years
Software [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Amortization Expense Charged Off Period |  |  | 3 years
Core Systems [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Amortization Expense Charged Off Period |  |  | 7 years
Minimum [Member] | State NMTC Investment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Tax credit earning period |  |  | 3 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Estimated useful lives of assets |  |  | 3 years
Maximum [Member] | State NMTC Investment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Tax credit earning period |  |  | 5 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Estimated useful lives of assets |  |  | 10 years
Commercial Loans [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Loss emergence periods |  |  | 24 months
Retail Loans [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Loss emergence periods |  |  | 12 months
Residential Mortgages Loans [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Loss emergence periods |  |  | 18 months

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