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Summary of Significant Accounting Policies Narrative (Details) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) subsidiarytrusts | Dec. 31, 2018 USD ($) subsidiarytrusts | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of banks owned | subsidiarytrusts |  |  | 3 |  |  |  |
Days past due for nonaccrual status |  | 90 days |  |  |  |  |
Financing receivable, obtaining certified third-party appraisal for impaired loans, period |  | 12 months |  |  |  |  |
Reclassification of stranded tax effects |  |  | $ 0 |  |  |  |
Subsidiary trusts owned by parent | subsidiarytrusts |  | 3 |  |  |  |  |
Extension term of leases |  | 5 years |  |  |  |  |
Increase in ACL |  | $ 291,940,000 | $ 169,410,000 |  |  | $ 166,209,000 | $ 176,084,000
Change in retained earnings |  | 1,120,781,000 |  |  |  | 1,079,391,000 |
Foreign currency open position |  | $ 500,000 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Increase in ACL |  |  |  |  |  | 58,348,000 |
Building and Building Improvements |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 50 years |  |  |  |  |
Furniture and Fixtures |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 8 years |  |  |  |  |
Equipment |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 5 years |  |  |  |  |
Consumer Loan |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of days closed end consumer loans are charged off when they become past due |  | 120 days |  |  |  |  |
Number of days open end consumer loans are charged off when they become past due |  | 180 days |  |  |  |  |
Residential Mortgage |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Change in ACL for certain OBS credit exposure |  | $ 1,100,000 |  |  |  | $ 3,200,000 |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Reclassification of stranded tax effects | $ 7,100,000 |  |  |  |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Increase in ACL |  |  |  |  | $ 58,300,000 |  |
Change in retained earnings |  |  |  |  | 43,800,000 |  |
Change in deferred tax assets |  |  |  |  | 12,400,000 |  |
Accounting Standards Update 2016-13 | Residential Mortgage |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Change in ACL for certain OBS credit exposure |  |  |  | $ (2,100,000) |  |  |
Accounting Standards Update 2016-13 | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Change in ACL for certain OBS credit exposure |  |  |  |  | $ 2,100,000 |  |
Employee Equity Plan |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |
Directors' Plan |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Award vesting period |  | 1 year |  |  |  |  |
Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Remaining lease term of operating leases |  | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Remaining lease term of operating leases |  | 20 years |  |  |  |  |

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