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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 |

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