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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 06, 2017 | Dec. 31, 2018
Accounting Policies [Line Items] |  |
FDIC indemnification asset termination, cash paid | $ 10.1 |
FDIC indemnification asset, termination benefit | $ 1.4 |
Minimum [Member] | Accounting Standards Update 201602 [Member] |  |
Accounting Policies [Line Items] |  |
Effect of adoption of new accounting pronouncements |  | $ 20.0
Maximum [Member] | Accounting Standards Update 201602 [Member] |  |
Accounting Policies [Line Items] |  |
Effect of adoption of new accounting pronouncements |  | $ 25.0

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