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Long-term Debt and Short Term Borrowings (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 19, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 07, 2019
Debt Instrument [Line Items]          
Loss on early extinguishment of debt   $ 4,592,000 [1] $ 0 $ 23,160,000  
FHLB | FCB Financial Holdings, Inc.          
Debt Instrument [Line Items]          
Long-term debt $ 150,000,000.0        
Loss on early extinguishment of debt $ 4,600,000        
Loans Receivable          
Debt Instrument [Line Items]          
Recorded balance loans receivable   6,190,000,000 $ 3,760,000,000    
5.90% Subordinated Notes, due February 7, 2029          
Debt Instrument [Line Items]          
Debt, face amount         $ 300,000,000.0
Stated percentage         5.90%
5.90% Subordinated Notes, due February 7, 2029 | After February 7, 2029          
Debt Instrument [Line Items]          
Stated percentage         3.379%
3.125% Senior Notes due November 1, 2022          
Debt Instrument [Line Items]          
Debt, face amount   $ 300,000,000      
Stated percentage   3.125%      
[1]
Where applicable, changes for balances as of December 31, 2019, compared to December 31, 2018, exclude amounts acquired on the Acquisition Date.