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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Loans and leases    
Loans and leases $ 13,700,374 $ 12,961,999
Outstanding loan balances, deferred loan costs and fees 54,600 42,200
Accrued interest receivable related to loans and leases recorded separately 51,900 49,000
Consumer, commercial and industrial, commercial real estate and residential real estate loans pledged to collateralize the borrowing capacity at the FRB 1,700,000 1,700,000
Real estate    
Loans and leases    
Loans and leases 5,262,672 4,959,975
Commercial and Industrial    
Loans and leases    
Loans and leases 2,043,807 2,087,099
Commercial and Industrial | Real estate    
Loans and leases    
Loans and leases 2,043,807 2,087,099
Commercial real estate    
Loans and leases    
Loans and leases 4,103,310 3,639,623
Commercial real estate | Real estate    
Loans and leases    
Loans and leases 4,103,310 3,639,623
Construction    
Loans and leases    
Loans and leases 765,862 813,969
Construction | Real estate    
Loans and leases    
Loans and leases 765,862 813,969
Residential Mortgage    
Loans and leases    
Loans and leases 4,252,041 4,083,367
Properties in the process of foreclosure 4,700 4,700
Home equity Line    
Loans and leases    
Loans and leases 1,010,631 876,608
Home equity Line | Real estate    
Loans and leases    
Loans and leases 1,010,631 876,608
Consumer    
Loans and leases    
Loans and leases 1,218,885 1,229,939
Consumer | Real estate    
Loans and leases    
Loans and leases 1,218,885 1,229,939
Asset Pledged as Collateral    
Loans and leases    
Loans and leases 7,700 7,500
Asset Pledged as Collateral | FHLB | Residential Mortgage    
Loans and leases    
Loans and leases $ 2,100,000 $ 2,400,000