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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Allowance for loan losses $ 72,965 [1] $ 71,405 $ 72,505
Allowance for loans individually evaluated for impairment 0    
Allowance for loans collectively evaluated for impairment 72,965    
Ending balance of loans 7,136,098    
Commercial Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Allowance for loan losses 34,525 32,159 32,759
Allowance for loans individually evaluated for impairment 0    
Allowance for loans collectively evaluated for impairment 34,525    
Ending balance of loans 3,444,266    
Consumer Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Allowance for loan losses 35,647 36,804 37,178
Allowance for loans individually evaluated for impairment 0    
Allowance for loans collectively evaluated for impairment 35,647    
Ending balance of loans 2,246,676    
Residential Real Estate [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Allowance for loan losses 2,793 $ 2,442 $ 2,568
Allowance for loans individually evaluated for impairment 0    
Allowance for loans collectively evaluated for impairment 2,793    
Ending balance of loans 1,445,156    
Originated Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans individually evaluated for impairment 18,253    
Ending balance of loans collectively evaluated for impairment 6,852,967    
Originated Loans [Member] | Commercial Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans individually evaluated for impairment 3,488    
Ending balance of loans collectively evaluated for impairment 3,325,512    
Originated Loans [Member] | Consumer Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans individually evaluated for impairment 7,044    
Ending balance of loans collectively evaluated for impairment 2,215,899    
Originated Loans [Member] | Residential Real Estate [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans individually evaluated for impairment 7,721    
Ending balance of loans collectively evaluated for impairment 1,311,556    
Acquired Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans collectively evaluated for impairment 264,878    
Acquired Loans [Member] | Commercial Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans collectively evaluated for impairment 115,266    
Acquired Loans [Member] | Consumer Loans [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans collectively evaluated for impairment 23,733    
Acquired Loans [Member] | Residential Real Estate [Member]      
Allowance for loan losses and recorded investment by portfolio segment [Abstract]      
Ending balance of loans collectively evaluated for impairment $ 125,879    
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.