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Accounting Policies and Basis of Presentation Summary of Significant Accounting Policies (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) vote branch | Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items] |  |
Allowance for Loan and Lease Losses, Reserve Release due to Update of Factors | $ 4,800,000 |
Nonmarketable Securities and Federal Home Loan Bank Stock | $ 37,700,000 | $ 52,800,000
Period fair values are subject to refinement | 1 year |
Number of branches | branch | 559 |
Net deferred fees on non-PCI loans | $ 16,600,000 | 20,800,000
Baseline for measurement | 500,000 |
Securities Sold under Agreements to Repurchase | 622,182,000 | 324,426,000
Short-term borrowings | $ 594,733,000 | $ 987,184,000
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 |
Premises | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life of asset | 7 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 |

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