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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 1,000 |  |
Tax credit carry forward period | 20 years |  |
Income tax benefit | $ 92,802 | $ 37,627 | $ 38,304
Reclassification of certain tax effects from accumulated other comprehensive loss |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Income tax benefit | $ (5,800) |  |
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 | 30 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 | 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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