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Goodwill and Other Intangible Assets (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
reporting_unit
Jun. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]        
Number of reporting units | reporting_unit     2  
Percent of income-based discounted cash flow approach used 60.00%      
Percent of market-based approach used 40.00%      
Goodwill impairment loss $ 0      
Amortization expense $ 2,600,000 $ 2,400,000 $ 5,300,000 $ 5,800,000
FCB Financial Holdings, Inc. | CDI        
Business Acquisition [Line Items]        
Useful life     10 years