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Premises and Equipment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 07, 2020
Premises and equipment          
Total $ 836,390,000 $ 497,725,000      
Less accumulated depreciation (257,151,000) (180,404,000)      
Net premises and equipment 579,239,000 317,321,000      
Depreciation expense charged to operations 25,300,000 18,200,000 $ 18,700,000    
Capitalized implementation costs related to new digital banking platform 2,100,000        
Capitalized implementation costs related to new public website 743,000        
2018-15          
Premises and equipment          
Capitalized implementation costs related to internal use software   2,900,000      
CSFL          
Premises and equipment          
Premises and equipment       $ 330,300,000 $ 313,435,000
Land          
Premises and equipment          
Total 152,263,000 74,913,000      
Buildings and leasehold improvements          
Premises and equipment          
Total $ 406,078,000 226,750,000      
Buildings and leasehold improvements | Minimum          
Premises and equipment          
Useful Life 15 years        
Buildings and leasehold improvements | Maximum          
Premises and equipment          
Useful Life 40 years        
Equipment and furnishings          
Premises and equipment          
Total $ 161,009,000 106,696,000      
Equipment and furnishings | Minimum          
Premises and equipment          
Useful Life 3 years        
Equipment and furnishings | Maximum          
Premises and equipment          
Useful Life 10 years        
Construction in process          
Premises and equipment          
Total $ 3,618,000 1,977,000      
Computer software          
Premises and equipment          
Useful Life 36 months        
Total $ 37,400,000 13,700,000      
Depreciation expense charged to operations 2,400,000 1,200,000 $ 2,100,000    
Lease right of use assets          
Premises and equipment          
Total $ 113,422,000 $ 87,389,000