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Accounting Policies and Basis of Presentation - Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) vote basis_points branch | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Nonmarketable Securities and Federal Home Loan Bank Stock | $ 25,300 | $ 52,700 |  |
Period fair values are subject to refinement | 1 year |  |  |
Number of branches | branch | 551 |  |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 147,300 | 128,000 |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ (50,051)
Merchant processing |  | 81,300 | $ 69,200 |
Cardholder processing |  | 27,800 | 20,800 |
Cardholder Reward Programs |  | $ 10,000 | $ 10,600 |
Cumulative effect of adoption of ASU 2018-02 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | 0
Cumulative effect of adoption of ASU 2016-01 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | 0
Class A Common Stock |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Votes per share of common stock | vote | 1 |  |  |
Class B Common Stock |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Votes per share of common stock | vote | 16 |  |  |
Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 70,000 |  |  |
Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 80,000 |  |  |
Income tax ASU cumulative effect adjustment [Member] | Cumulative effect of adoption of ASU 2018-02 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | 31,300
Financial Instruments ASU cumulative effect adjustment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ 18,700
Capital basis points | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle Effect of Adoption Capital Quantification | basis_points | 3 |  |  |
Capital basis points | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle Effect of Adoption Capital Quantification | basis_points | 4 |  |  |

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