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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 |  |

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