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Summary of Significant Accounting Policies (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 Rate | Dec. 18, 2017 USD ($) | Dec. 31, 2017 USD ($) branch | Dec. 31, 2017 USD ($) vote branch | Dec. 31, 2017 USD ($) basis_points branch | Dec. 31, 2017 USD ($) branch Rate | Dec. 31, 2017 USD ($) branch | Dec. 31, 2017 USD ($) branch | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 01, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate | 21.00% |  |  |  |  | 35.00% |  | 35.00% |  |  |
Total purchase price |  | $ 113,600,000 |  |  |  |  |  |  |  |  |
Net impact from FDIC shared-loss termination |  |  |  |  |  |  | $ (45,000) |  | $ 16,559,000 | $ 0 |
Gain on acquisitions |  |  |  |  |  |  | 134,745,000 |  | 5,831,000 | $ 42,930,000 |
Nonmarketable Securities and Federal Home Loan Bank Stock |  |  | $ 53,000,000 | $ 53,000,000 | $ 53,000,000 | $ 53,000,000 | $ 53,000,000 | $ 53,000,000 | 43,800,000 |  |
Period fair values are subject to refinement |  |  | 1 year |  |  |  |  |  |  |  |
Number of branches | branch |  |  | 545 | 545 | 545 | 545 | 545 | 545 |  |  |
Baseline for measurement |  |  | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 |  |  |
Short-term borrowings |  |  | 693,807,000 | 693,807,000 | 693,807,000 | 693,807,000 | 693,807,000 | 693,807,000 | 603,487,000 |  |
Amortization Method Qualified Affordable Housing Project Investments |  |  | $ 128,000,000 | $ 128,000,000 | $ 128,000,000 | $ 128,000,000 | 128,000,000 | $ 128,000,000 | $ 109,800,000 |  |
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 |  |  |  |  |  |  | 65,000,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  | $ 85,000,000 |  |  |  |
Premises | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of asset |  |  | 3 years |  |  |  |  |  |  |  |
Premises | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of asset |  |  | 40 years |  |  |  |  |  |  |  |
Furniture, Software, and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of asset |  |  | 3 years |  |  |  |  |  |  |  |
Furniture, Software, and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of asset |  |  | 10 years |  |  |  |  |  |  |  |
Income tax ASU cumulative effect adjustment [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  | $ 27,200,000
Financial Instruments ASU cumulative effect adjustment [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  | $ 18,700,000
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 |  |  |  |  | 4 |  |  |  |  |  |
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 |  |  |  |  | 6 |  |  |  |  |  |

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