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v3.19.3.a.u2

Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Trust assets |  |  |  |
Assets under care |  | $ 9,700.0 | $ 7,100.0 |
Loan servicing and portfolio loans |  |  |  |
Unpaid principal balances of loans serviced |  | 2,200.0 |  |
Impairment charges |  | 0.0 | 0.0 |
Goodwill |  |  |  |
Goodwill impairment |  | 0.0 | 0.0 |
Income taxes |  |  |  |
Non-cash charge due to revaluation of Company's net deferred tax position following the enactment of the TCJA | $ 8.1 |  |  |
Valuation allowance |  | 0.0 |  |
Accruals for payments of interest and penalties |  | 0.0 | 0.0 |
Stock-based employee compensation |  |  |  |
Compensation expense recognized |  | $ 3.8 | $ 3.5 | $ 2.6
Segment disclosure |  |  |  |
Number of operating segments | segment |  | 3 |  |
Buildings and improvements | Minimum |  |  |  |
Premises and Equipment, net |  |  |  |
Estimated Useful Life |  | 3 years |  |
Buildings and improvements | Maximum |  |  |  |
Premises and Equipment, net |  |  |  |
Estimated Useful Life |  | 40 years |  |
Furniture and equipment | Minimum |  |  |  |
Premises and Equipment, net |  |  |  |
Estimated Useful Life |  | 3 years |  |
Furniture and equipment | Maximum |  |  |  |
Premises and Equipment, net |  |  |  |
Estimated Useful Life |  | 10 years |  |
Restricted stock unit | Minimum |  |  |  |
Stock-based employee compensation |  |  |  |
Requisite service periods |  | 1 year |  |
Restricted stock unit | Maximum |  |  |  |
Stock-based employee compensation |  |  |  |
Requisite service periods |  | 5 years |  |

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