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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract loan | Dec. 31, 2019 USD ($) contract
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 1,689 | 5 | 3
Recorded Investment | $ 23,765 | $ 7,795 | $ 1,180
Related ACL | 2,605 | 590 | $ 25
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 6,700,000 | 6,100,000 |
Commitments related to borrowers who had loan terms modified in a TDR | $ 200 | $ 200 |
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 414 | 1 | 2
Recorded Investment, Defaulted TDRs | $ 7,659 | $ 500 | $ 571
Commercial and Industrial |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 11 | 1 | 2
Recorded Investment | $ 1,481 | $ 500 | $ 571
Related ACL | $ 124 | $ 30 | $ 25
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 3 | 1 | 2
Recorded Investment, Defaulted TDRs | $ 569 | $ 500 | $ 571
Commercial real estate |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 1 | 3 |
Recorded Investment | $ 346 | $ 6,470 |
Related ACL | $ 78 | $ 470 |
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 1 |  |
Recorded Investment, Defaulted TDRs | $ 356 |  |
Residential Mortgage |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract |  | 1 | 1
Recorded Investment |  | $ 825 | $ 609
Related ACL |  | $ 90 |
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 4 |  |
Recorded Investment, Defaulted TDRs | $ 1,012 |  |
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure | 300 |  |
Residential Mortgage | Real estate property held from foreclosed TDR |  |  |
Loans modified in TDRs that experienced a payment default |  |  |
Real estate property held from a foreclosed TDR | $ 200 |  |
Consumer |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 1,652 |  |
Recorded Investment | $ 15,710 |  |
Related ACL | $ 2,127 |  |
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 405 |  |
Recorded Investment, Defaulted TDRs | $ 5,272 |  |
Construction |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 12 |  |
Recorded Investment | $ 689 |  |
Related ACL | $ 69 |  |
Loans modified in TDRs that experienced a payment default |  |  |
Number of Contracts, Defaulted TDRs | contract | 1 |  |
Recorded Investment, Defaulted TDRs | $ 450 |  |
Residential Mortgage. |  |  |
Troubled debt restructuring modifications |  |  |
Number of Contracts | contract | 13 |  |
Recorded Investment | $ 5,539 |  |
Related ACL | 207 |  |
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 |
Commitments to extend credit |  |  |
Troubled debt restructuring modifications |  |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 6,490,301 | $ 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 | 182,447 | 185,108 |
Commercial letters of credit |  |  |
Troubled debt restructuring modifications |  |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | $ 3,307 | $ 3,834 |

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