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Preparation of Interim Financial Statements (Details) $ in Thousands | Jan. 01, 2020 USD ($) | Sep. 30, 2021 USD ($) financial_center | Dec. 31, 2020 USD ($)
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Number of financial centers | financial_center |  | 185 |
Allowance for credit loss |  | $ 202,508 | $ 238,050
Unfunded commitments, allowance for credit loss |  | 22,400 | 22,400
Cumulative effect on retained earnings |  | $ 1,065,566 | $ 901,006
Cumulative Effect, Period of Adoption, Adjustment |  |  |
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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- Definition Amount of allowance for credit loss at acquisition date of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922903-210455 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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