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Loans - Narrative (Details)
 6 Months Ended
Jun. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 5,149,497,000 $ 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 1,000,000.0  
Restructuring Reserve 3,500,000  
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]    
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing 3,999,000  
Loans and Leases Receivable, Gross 5,046,182,000 4,303,600,000
Post-Modification Outstanding Recorded Balance $ 520,000  
Financing Receivable, Modifications, Number of Contracts | loan 3  
Restructuring Reserve $ 184,000 225,000
Financing Receivable, before Allowance for Credit Loss 5,048,164,000 4,305,626,000
Non-Covered Loans | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing 0  
Loans and Leases Receivable, Gross 129,059,000 105,325,000
Restructuring Reserve 0 0
Financing Receivable, before Allowance for Credit Loss 131,041,000 107,351,000
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, before Allowance for Credit Loss 103,315,000 46,401,000
Recorded Investment PCI Loans 103,315,000 46,401,000
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, before Allowance for Credit Loss 243,000 4,000
Recorded Investment PCI Loans 243,000 $ 4,000
As Recorded by Trinity | Non-Covered Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 600,000,000  
As Recorded by Trinity | Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded Investment PCI Loans $ 68,000,000