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Allowance for Credit Losses - Disaggregation of ACL by Impairment Methodology (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 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 $ 157,262 $ 208,454 130,530 $ 141,718
Loans and leases:        
Individually evaluated for impairment     20,638  
Collectively evaluated for impairment     13,191,012  
Total loans and leases 12,961,999 13,279,097 13,211,650  
Commercial Lending        
Loans and leases:        
Total loans and leases 6,772,085 7,393,413    
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 20,080 24,711 28,975 34,501
Loans and leases:        
Individually evaluated for impairment     4,951  
Collectively evaluated for impairment     2,738,291  
Total loans and leases 2,087,099 3,019,507 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 42,951 58,123 22,325 19,725
Loans and leases:        
Individually evaluated for impairment     723  
Collectively evaluated for impairment     3,463,230  
Total loans and leases 3,639,623 3,392,676 3,463,953  
Construction        
Allowance for loan and lease losses:        
Collectively evaluated for impairment     4,844  
Total allowance for loan and lease losses 9,773 10,039 4,844 5,813
Loans and leases:        
Collectively evaluated for impairment     519,241  
Total loans and leases 813,969 735,819 519,241  
Lease financing        
Allowance for loan and lease losses:        
Collectively evaluated for impairment     424  
Total allowance for loan and lease losses 1,659 3,298 424 432
Loans and leases:        
Collectively evaluated for impairment     202,483  
Total loans and leases 231,394 245,411 202,483  
Residential Mortgage        
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 44,906
Loans and leases:        
Individually evaluated for impairment     14,964  
Collectively evaluated for impairment     4,647,211  
Total loans and leases 4,083,367 3,690,218 4,662,175  
Consumer        
Allowance for loan and lease losses:        
Collectively evaluated for impairment     34,644  
Total allowance for loan and lease losses 42,793 64,659 34,644 35,813
Loans and leases:        
Collectively evaluated for impairment     1,620,556  
Total loans and leases $ 1,229,939 $ 1,353,842 1,620,556  
Unallocated        
Allowance for loan and lease losses:        
Collectively evaluated for impairment     139  
Total allowance for loan and lease losses     $ 139 $ 528