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v3.20.4

Non Purchased Loans - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |
Outstanding balance of restructured loans |  | $ 10,757,503,000 | $ 9,637,476,000 |  |
Minimum duration for past due residential loans to be considered as nonperforming |  | 90 days |  |  |
Allowance for loan losses attributable to restructured loans |  | $ 176,144,000 | $ 52,162,000 | $ 49,026,000 | $ 46,211,000
Non-Purchased |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |
Nonperforming loans charged-off past due period |  | 90 days |  |  |
Number of restructured loans | loan |  | 2 | 2 |  |
Minimum duration for past due residential loans to be considered as nonperforming |  | 90 days | 90 days |  |
Modifications, recorded investment |  | $ 11,761,000 | $ 4,679,000 | 5,325,000 |
Modifications, subsequent default, recorded investment |  | 448,000 |  | $ 139,000 |
Remaining availability under commitments to lend additional funds on restructured loans |  | $ 0 | $ 0 |  |
Consumer and other retail loans charged off past due period |  | 180 days |  |  |
Number of loan modifications | loan |  | 38 | 7 | 11 |
Modified loans, balance |  | $ 9,040,000 | $ 647,000 | $ 1,858,000 |
Unfunded commitment |  | $ 19,911,000 | 7,266,000 |  |
Average recorded investment in impaired loans |  |  | 38,188,000 | 27,080,000 |
Interest income, impaired |  |  | 823,000 | $ 549,000 |
Non-Purchased | Payment Deferral | Loan Deferral Program, CARES Act |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |
Deferral period | 90 days |  |  |  |
Number of loan modifications | loan |  | 622 |  |  |
Modified loans, balance |  | $ 112,000,000 |  |  |
Non-Purchased | Nonaccruing Loans |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |
Outstanding balance of restructured loans |  | 177,000 | 164,000 |  |
Non-Purchased | Restructured Loans |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |
Outstanding balance of restructured loans |  | 5,787,000 | 3,058,000 |  |
Allowance for loan losses attributable to restructured loans |  | $ 337,000 | $ 125,000 |  |

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