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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2021 USD ($) contract loan | Sep. 30, 2020 USD ($) contract | Dec. 31, 2020 USD ($) loan
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract | 150 |  | 1,700 | 1 |
Recorded Investment | $ 1,950 |  | $ 24,508 | $ 500 |
Related ACL | 247 |  | 2,622 | $ 30 |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 6,700,000 |  | 6,700,000 |  | $ 6,100,000
Commitments related to borrowers who had loan terms modified in a TDR | $ 200 |  | $ 200 |  | $ 200
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract | 235 | 1 | 322 | 1 |
Recorded Investment, Defaulted TDRs | $ 4,619 | $ 500 | $ 6,722 | $ 500 |
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure | $ 300 |  | $ 300 |  |
Commercial and Industrial |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract |  |  | 13 | 1 |
Recorded Investment |  |  | $ 1,946 | $ 500 |
Related ACL |  |  | $ 127 | $ 30 |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract | 2 | 1 | 3 | 1 |
Recorded Investment, Defaulted TDRs | $ 265 | $ 500 | $ 613 | $ 500 |
Commercial real estate |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract |  |  | 1 |  |
Recorded Investment |  |  | $ 365 |  |
Related ACL |  |  | $ 75 |  |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract | 1 |  | 1 |  |
Recorded Investment, Defaulted TDRs | $ 500 |  | $ 500 |  |
Consumer |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract | 150 |  | 1,671 |  |
Recorded Investment | $ 1,950 |  | $ 15,916 |  |
Related ACL | $ 247 |  | $ 2,128 |  |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract | 230 |  | 314 |  |
Recorded Investment, Defaulted TDRs | $ 3,258 |  | $ 4,366 |  |
Construction |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract |  |  | 2 |  |
Recorded Investment |  |  | $ 699 |  |
Related ACL |  |  | $ 79 |  |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract |  |  | 1 |  |
Recorded Investment, Defaulted TDRs |  |  | $ 359 |  |
Residential Mortgage. |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Number of Contracts | contract |  |  | 13 |  |
Recorded Investment |  |  | $ 5,582 |  |
Related ACL |  |  | $ 213 |  |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of Contracts, Defaulted TDRs | contract | 2 |  | 3 |  |
Recorded Investment, Defaulted TDRs | $ 596 |  | $ 884 |  |
Number of loans collateralized by real estate property modified in a TDR in the process of foreclosure | loan |  |  |  |  | 0
Residential Mortgage. | Real estate property held from foreclosed TDR |  |  |  |  |
Loans modified in TDRs that experienced a payment default |  |  |  |  |
Number of real estate properties | loan | 0 |  | 0 |  | 0
Commitments to extend credit |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | $ 6,513,489 |  | $ 6,513,489 |  | $ 5,934,535
Standby letters of credit |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 175,584 |  | 175,584 |  | 185,108
Commercial letters of credit |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | $ 5,971 |  | $ 5,971 |  | $ 3,834

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