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v3.20.2

Preparation of Interim Financial Statements (Details) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) financial_center | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Number of financial centers | financial_center |  | 226 |
Allowance for credit loss |  | $ 248,251 | $ 68,244
Unfunded commitments, allowance for credit loss |  | 24,400 | 8,400
Cumulative effect on retained earnings |  | $ 866,503 | $ 848,848
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member
Impact of ASU 2016-13 adoption |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Allowance for credit loss | $ 151,400 |  |
Unfunded commitments, allowance for credit loss | 24,000 |  |
Debt securities, allowance for credit loss | 742 |  |
Cumulative effect on retained earnings | 128,100 |  |
Purchased with credit deterioration, allowance for credit loss | $ 5,400 |  |

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