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Loans - Narrative (Details)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 5,017,077,000 $ 4,350,001,000
Number of loans over 90 days past due and still accruing interest | loan   0
Unadvanced commitments on impaired loans   $ 94,000
Specific reserves on restructured loans 1,200,000.0  
Restructuring Reserve 4,700,000  
Unadvanced Commitment on Impaired Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans 430,000 350,000
Non-Covered Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 4,894,574,000 4,303,600,000
Restructuring Reserve 191,000 225,000
Financing Receivable, Gross 4,896,486,000 4,305,626,000
Non-Covered Loans | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 117,456,000 105,325,000
Restructuring Reserve 0 0
Financing Receivable, Gross 119,368,000 107,351,000
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Gross 122,503,000 46,401,000
Recorded Investment PCI Loans 122,503,000 46,401,000
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Gross 264,000 4,000
Recorded Investment PCI Loans 264,000 $ 4,000
As Recorded by TCC | Non-Covered Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 602,000,000  
As Recorded by TCC | Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded Investment PCI Loans $ 80,000,000