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Allowance for Credit Losses - Disaggregation of ACL by Impairment Methodology (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for loan and lease losses:          
Individually evaluated for impairment     $ 203    
Collectively evaluated for impairment     130,327    
Total allowance for loan and lease losses $ 166,013 $ 131,300 130,530 $ 141,546 $ 141,718
Loans and leases:          
Individually evaluated for impairment     20,638    
Collectively evaluated for impairment     13,191,012    
Total loans and leases 13,380,270   13,211,650    
Commercial and Industrial          
Allowance for loan and lease losses:          
Individually evaluated for impairment     46    
Collectively evaluated for impairment     28,929    
Total allowance for loan and lease losses 20,884   28,975 31,793 34,501
Loans and leases:          
Individually evaluated for impairment     4,951    
Collectively evaluated for impairment     2,738,291    
Total loans and leases 3,025,345   2,743,242    
Commercial real estate          
Allowance for loan and lease losses:          
Individually evaluated for impairment     27    
Collectively evaluated for impairment     22,298    
Total allowance for loan and lease losses 42,838   22,325 21,197 19,725
Loans and leases:          
Individually evaluated for impairment     723    
Collectively evaluated for impairment     3,463,230    
Total loans and leases 3,413,014   3,463,953    
Construction          
Allowance for loan and lease losses:          
Collectively evaluated for impairment     4,844    
Total allowance for loan and lease losses 8,824   4,844 5,381 5,813
Loans and leases:          
Collectively evaluated for impairment     519,241    
Total loans and leases 572,062   519,241    
Lease financing          
Allowance for loan and lease losses:          
Collectively evaluated for impairment     424    
Total allowance for loan and lease losses 851   424 411 432
Loans and leases:          
Collectively evaluated for impairment     202,483    
Total loans and leases 236,623   202,483    
Residential          
Allowance for loan and lease losses:          
Individually evaluated for impairment     130    
Collectively evaluated for impairment     39,049    
Total allowance for loan and lease losses     39,179    
Loans and leases:          
Individually evaluated for impairment     14,964    
Collectively evaluated for impairment     4,647,211    
Total loans and leases     4,662,175    
Consumer          
Allowance for loan and lease losses:          
Collectively evaluated for impairment     34,644    
Total allowance for loan and lease losses 56,039   34,644 35,099 35,813
Loans and leases:          
Collectively evaluated for impairment     1,620,556    
Total loans and leases $ 1,568,073   1,620,556    
Unallocated          
Allowance for loan and lease losses:          
Collectively evaluated for impairment     139    
Total allowance for loan and lease losses     $ 139 $ 2,754 $ 528