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Acquisition Activity - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
bank
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition [Line Items]            
Goodwill   $ 1,188,902 $ 1,188,902 $ 726,856 $ 724,603  
Increase (decrease) in goodwill due to adjustments     462,046      
Amortization of acquisition intangibles     12,590 8,415 $ 7,811  
Sabadell United            
Business Acquisition [Line Items]            
Loans acquired $ 4,000,000 4,026,240 4,026,240      
Interest-bearing deposits acquired $ 4,400,000 4,383,049 4,383,049      
Number of offices acquired | bank 25          
Cash consideration $ 809,159          
Percentage of voting interests acquired 100.00%          
Goodwill $ 462,046 462,000 462,000     $ 431,800
Increase (decrease) in goodwill due to adjustments   30,200 462,000      
Merger related costs     41,000      
Sabadell United | Fair Value Adjustments            
Business Acquisition [Line Items]            
Amortization of premiums and accretion of discounts on acquired loans, securities, and deposits     20,300 38,800    
Elimination of amortization of premiums and accretion of discounts on previously acquired loans, securities, FDIC indemnification asset, and deposits     1,300 4,100    
Allowance for loan and lease losses acquired     6,400 5,900    
Amortization of acquisition intangibles     5,900 $ 10,100    
Sabadell United | Common Stock            
Business Acquisition [Line Items]            
Common stock issued (shares) | shares 2,610,304          
Sabadell United | Core deposit intangible assets            
Business Acquisition [Line Items]            
Intangible assets acquired $ 96,607 66,600 $ 66,600      
Increase (decrease) in goodwill due to adjustments   30,000        
Decrease in intangible assets recognized due to adjustments   $ (30,007)