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Loans (Composition of loan portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount $ 6,766,114 $ 4,726,493
Allowance for credit losses (230,755) (116,539)
Total loans held for investment 6,535,359 6,622,256
Mortgage loans held-for-sale 5,815  
Total loans, net 6,541,174 6,641,847
Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 2,301,351  
Mortgage Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 2,449,540  
Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 2,015,223  
Acquired Non-PCD [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 4,767,586  
Allowance for credit losses (149,961)  
Total loans held for investment 4,617,625  
Mortgage loans held-for-sale 5,815  
Total loans, net 4,623,440  
Acquired Non-PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,910,193  
Acquired Non-PCD [Member] | Mortgage Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 887,982  
Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,969,411  
Acquired PCD [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,998,528  
Allowance for credit losses (80,794)  
Total loans held for investment 1,917,734  
Mortgage loans held-for-sale 0  
Total loans, net 1,917,734  
Acquired PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 391,158  
Acquired PCD [Member] | Mortgage Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,561,558  
Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 45,812  
Commercial Secured By Real Estate [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,115,253  
Commercial Secured By Real Estate [Member] | Acquired Non-PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 854,187  
Commercial Secured By Real Estate [Member] | Acquired PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 261,066  
Other Commercial And Industrial [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 874,067  
Other Commercial And Industrial [Member] | Acquired Non-PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 743,975  
Other Commercial And Industrial [Member] | Acquired PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 130,092  
US Loan Program [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 312,031  
US Loan Program [Member] | Acquired Non-PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 312,031  
US Loan Program [Member] | Acquired PCD [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 0  
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 361,060  
Personal Loan [Member] | Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 358,253  
Personal Loan [Member] | Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 2,807  
Credit Lines [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 51,918  
Credit Lines [Member] | Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 51,379  
Credit Lines [Member] | Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 539  
Credit Cards [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 71,875  
Credit Cards [Member] | Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 71,875  
Credit Cards [Member] | Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 0  
Overdraft [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 203  
Overdraft [Member] | Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 203  
Overdraft [Member] | Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 0  
Auto Loan [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,530,167  
Auto Loan [Member] | Acquired Non-PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount 1,487,701  
Auto Loan [Member] | Acquired PCD [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount $ 42,466  
Originated Loan [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   3,884,280
Originated Loan [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,667,494
Originated Loan [Member] | Mortgage Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   577,416
Originated Loan [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,639,370
Originated Loan [Member] | Commercial Secured By Real Estate [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   831,040
Originated Loan [Member] | Other Commercial And Industrial [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   563,859
Originated Loan [Member] | US Loan Program [Member] | Commercial Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   272,595
Originated Loan [Member] | Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   332,030
Originated Loan [Member] | Credit Lines [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,778
Originated Loan [Member] | Credit Cards [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   27,614
Originated Loan [Member] | Auto Loan [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,277,732
Originated Loan [Member] | Auto Loan [Member] | Consumer Portfolio Segment [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,277,732
Originated Loan [Member] | Mortgage Loan [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   577,416
Originated Loan [Member] | Commercial Loan [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   1,667,494
Originated Loan [Member] | Consumer Loan [Member]    
Loans And Leases Receivable Net Reported Amount    
Loans and Leases Receivable, Gross, Carrying Amount   $ 361,638