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Summary of significant accounting policies - Changes In Accounting Standard Updates (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses $ 101,201   $ 53,355 $ 52,119 $ 53,637
Allowance for loan commitments 4,300   1,741    
Retained earnings 660,398 $ 622,042 622,042    
Loans and leases receivable before fees, gross 5,232,642 5,067,821 5,067,821    
Total assets 15,004,007 13,745,251 13,745,251 13,104,051  
Deferred income taxes 395,089 379,324 379,324    
Other 618,438 583,545 583,545    
Total liabilities 12,632,212 11,430,698 11,430,698    
Total shareholders’ equity 2,337,502 2,280,260 2,280,260 $ 2,162,280 $ 2,097,386
Total liabilities and shareholders’ equity $ 15,004,007 13,745,251 13,745,251    
Impact of ASU No. 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses   21,000 19,441    
Allowance for loan commitments   2,000 1,559    
Retained earnings   (15,372)      
Loans and leases receivable before fees, gross   (19,441)      
Total assets   (19,441)      
Deferred income taxes   (5,628)      
Other   1,559      
Total liabilities   (4,069)      
Total shareholders’ equity   (15,372) (15,372)    
Total liabilities and shareholders’ equity   (19,441)      
As reported under ASU No. 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings   606,670      
Loans and leases receivable before fees, gross   5,048,380      
Total assets   13,725,810      
Deferred income taxes   373,696      
Other   585,104      
Total liabilities   11,426,629      
Total shareholders’ equity   2,264,888 $ 2,264,888    
Total liabilities and shareholders’ equity   $ 13,725,810