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Goodwill and Other Intangible Assets (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
reporting_unit
Sep. 30, 2019
USD ($)
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     $ 44,877 $ 0
Reporting unit, percentage of fair value in excess of carrying amount 10.00%   10.00%  
Amortization expense $ 2,600 $ 2,900 $ 7,900 $ 8,700
FCB Financial Holdings, Inc. | CDI        
Business Acquisition [Line Items]        
Useful life     10 years