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Borrowings (Long Term Debt) (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Notes and subordinated debt $ 553,756,000 $ 227,320,000
Long-term Debt, Weighted Average Interest Rate, over Time 3.62%  
Debt issuance cost on senior fixed-rates $ (3,131,000) (691,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 0  
Long-term debt $ 549,158,000 $ 226,021,000
Variable interest rate 5.09% 5.74%
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.95%  
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Discount on senior fixed-rate notes $ (1,467,000) $ (608,000)
4.375% Senior fixed-rate notes due February 15, 2024 [Member]    
Debt Instrument [Line Items]    
Notes and subordinated debt 300,000,000.0  
Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 [Member]    
Debt Instrument [Line Items]    
Notes and subordinated debt [1] $ 77,320,000 77,320,000
Debt Instrument, Redemption, Period One [Member] | 4.375% Senior fixed-rate notes due February 15, 2024 [Member]    
Debt Instrument [Line Items]    
Senior notes, interest rate (as a percent) 4.375%  
Notes and subordinated debt $ 150,000,000 150,000,000
Debt Instrument, Redemption, Period Two [Member] | 4.375% Senior fixed-rate notes due February 15, 2024 [Member]    
Debt Instrument [Line Items]    
Senior notes, interest rate (as a percent) 4.10%  
Notes and subordinated debt $ 326,436,000 $ 0
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 26,436,000  
[1] The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month London Interbank Offered Rate plus 2.95%, was 5.09% at September 30, 2019 and 5.74% at December 31, 2018