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Premises and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Premises and equipment        
Total $ 497,725,000 $ 415,208,000    
Less accumulated depreciation (180,404,000) (174,132,000)    
Net premises and equipment 317,321,000 241,076,000    
Depreciation expense charged to operations 18,200,000 18,700,000 $ 15,200,000  
Capitalized implementation costs related to new commercial loan platform 1,100,000      
Internal use software        
Premises and equipment        
Capitalized implementation costs related to a front capture software product 171,000      
2018-15        
Premises and equipment        
Capitalized implementation costs related to internal use software 1,300,000      
2018-15 | Internal use software        
Premises and equipment        
Capitalized implementation costs related to internal use software       $ 1,300,000
Capitalized implementation costs related to new commercial loan platform       1,100,000
Capitalized implementation costs related to a front capture software product       $ 171,000
Land        
Premises and equipment        
Total 74,913,000 77,338,000    
Buildings and leasehold improvements        
Premises and equipment        
Total $ 226,750,000 224,620,000    
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 $ 106,696,000 109,468,000    
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 $ 1,977,000 3,782,000    
Computer software        
Premises and equipment        
Useful Life 36 months      
Total $ 13,700,000 13,500,000    
Depreciation expense charged to operations 1,200,000 $ 2,100,000 $ 2,500,000  
Lease right of use assets        
Premises and equipment        
Total $ 87,389,000