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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Maximum refinement period of fair values after closing date of acquisition | 1 year
Loan minimum balance included in specific reseve analysis | $ 1
Tax credit carry forward period | 20 years
Federal NMTC Investment [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Tax credit earning period | 7 years
State NMTC Investment [Member] | Minimum [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Tax credit earning period | 3 years
State NMTC Investment [Member] | Maximum [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Tax credit earning period | 5 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 | 39 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Estimated useful lives of assets | 3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Estimated useful lives of assets | 10 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
Commercial Loans [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Loss emergence periods | 18 months
Retail Loans [Member] |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |
Loss emergence periods | 12 months

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