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Summary of Significant Accounting Policies (Core Deposit Intangibles and Customer Relationship Intangibles, Net) (Details)
 12 Months Ended
Dec. 31, 2018
Core Deposit Intangibles | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Useful life 8 years
Core Deposit Intangibles | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Useful life 18 years
Customer Relationship Intangible  
Finite-Lived Intangible Assets [Line Items]  
Useful life 22 years