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Loans - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross   $ 5,228,014,000   $ 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   600,000    
Restructuring Reserve   3,300,000    
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   60,000    
Loans and Leases Receivable, Gross   5,132,391,000   4,303,600,000
Post-Modification Outstanding Recorded Balance $ 187,000 $ 520,000 $ 187,000  
Financing Receivable, Modifications, Number of Contracts | loan 1 3 1  
Restructuring Reserve   $ 79,000   225,000
Financing Receivable, before Allowance for Credit Loss   5,134,737,000   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   10,000    
Loans and Leases Receivable, Gross   136,744,000   105,325,000
Restructuring Reserve   0   0
Financing Receivable, before Allowance for Credit Loss   139,090,000   107,351,000
Covered Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss   95,623,000   46,401,000
Recorded Investment PCI Loans   95,623,000   46,401,000
Covered Loans [Member] | Consumer and other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss   228,000   4,000
Recorded Investment PCI Loans   228,000   $ 4,000
As Recorded by Trinity | Non-Covered Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross   562,400,000    
As Recorded by Trinity | Covered Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded Investment PCI Loans   $ 62,200,000