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Allowance for Credit Losses and Credit Quality of Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Credit Losses [Abstract]        
Allowance for credit losses [1] $ 110,000      
Allowance for credit losses   $ 72,965 [1] $ 72,505 $ 69,500
Retained earnings 749,056 $ 696,214    
Loans purchased with credit deterioration $ 0      
Percentage of allowance of credit losses 1.47% 1.02%    
Provision for loan and lease losses $ 51,100 $ 25,400    
ASU 2016-13 [Member]        
Allowance for Credit Losses [Abstract]        
Allowance for credit losses 110,000 75,999    
ASU 2016-13 [Member] | Loans [Member]        
Allowance for Credit Losses [Abstract]        
Allowance for credit losses 3,000      
Retained earnings (2,300)      
Deferred tax asset 700      
ASU 2016-13 [Member] | Accrued Interest Receivable [Member]        
Allowance for Credit Losses [Abstract]        
Allowance for credit losses 600      
AIR on loans $ 23,700      
Write-off of uncollectible interest period 120 days      
Consumer Loans [Member]        
Allowance for Credit Losses [Abstract]        
Allowance for credit losses   35,647 $ 37,178 $ 36,830
Amount of loans purchased $ 51,900      
Discount on loans purchased 1.00%      
Allowance for credit losses on loans purchased $ 3,600      
Consumer Loans [Member] | ASU 2016-13 [Member]        
Allowance for Credit Losses [Abstract]        
Allowance for credit losses $ 37,803 $ 32,122    
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.