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Allowance for Credit Losses - Disaggregation of ACL by Impairment Methodology (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 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 $ 192,120   $ 131,300 130,530 $ 138,535 $ 141,546 $ 141,718
Loans and leases:              
Individually evaluated for impairment       20,638      
Collectively evaluated for impairment       13,191,012      
Total loans and leases 13,764,030     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 21,299 $ 20,884   28,975 31,688 31,793 34,501
Loans and leases:              
Individually evaluated for impairment       4,951      
Collectively evaluated for impairment       2,738,291      
Total loans and leases 3,423,708     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 53,122 42,838   22,325 22,204 21,197 19,725
Loans and leases:              
Individually evaluated for impairment       723      
Collectively evaluated for impairment       3,463,230      
Total loans and leases 3,423,499     3,463,953      
Construction              
Allowance for loan and lease losses:              
Collectively evaluated for impairment       4,844      
Total allowance for loan and lease losses 5,276 8,824   4,844 5,014 5,381 5,813
Loans and leases:              
Collectively evaluated for impairment       519,241      
Total loans and leases 617,935     519,241      
Lease financing              
Allowance for loan and lease losses:              
Collectively evaluated for impairment       424      
Total allowance for loan and lease losses 3,837 851   424 446 411 432
Loans and leases:              
Collectively evaluated for impairment       202,483      
Total loans and leases 238,287     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 67,077 56,039   34,644 33,638 35,099 35,813
Loans and leases:              
Collectively evaluated for impairment       1,620,556      
Total loans and leases 1,492,160     1,620,556      
Unallocated              
Allowance for loan and lease losses:              
Collectively evaluated for impairment       139      
Total allowance for loan and lease losses $ 192,120 $ 166,013   $ 139 $ 2,125 $ 2,754 $ 528