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Summary of Significant Accounting Policies Narrative (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) subsidiarytrusts | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Days past due for nonaccrual status | 90 days |  |  |  |
Increase in ACL | $ 263,534 | $ 291,940 |  | $ 166,209 | $ 169,410
Change in retained earnings | 1,282,383 | 1,120,781 |  |  |
Change in ACL for certain OBS credit exposure | $ 3,800 | 5,300 |  |  |
Financing receivable, obtaining certified third-party appraisal for impaired loans, period | 12 months |  |  |  |
Foreign currency open position | $ 500 |  |  |  |
Subsidiary trusts owned by parent | subsidiarytrusts | 3 |  |  |  |
Extension term of leases | 5 years |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Increase in ACL |  |  |  | $ 58,348 |
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 | $ 1,100 |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Increase in ACL |  |  | $ 58,300 |  |
Change in retained earnings |  |  | (43,800) |  |
Change in deferred tax assets |  |  | 12,400 |  |
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 |  |
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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