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Non Purchased Loans - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2020 USD ($) loan | Mar. 31, 2020 | Sep. 30, 2019 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) loan | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Outstanding balance of restructured loans | $ 10,916,640,000 |  |  | $ 10,916,640,000 |  |  | $ 9,637,476,000 |  |
Allowance for loan losses attributable to restructured loans | 168,098,000 |  | $ 50,814,000 | $ 168,098,000 | $ 50,814,000 | $ 145,387,000 | $ 52,162,000 | $ 50,059,000 | $ 49,026,000
Non purchased loans and leases |  |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Mortgage and commercial loans discontinued past due period |  |  |  | 90 days |  |  |  |  |
Consumer and other retail loans charged-off past due period |  |  |  | 120 days |  |  |  |  |
Interest income |  |  |  | $ 189,000 |  |  |  |  |
Troubled debt restructured that has subsequently defaulted |  |  |  | $ 420,000 | $ 61,000 |  |  |  |
Nonperforming loans charged-off past due period |  |  |  | 90 days |  |  |  |  |
Number of restructured loans | loan |  |  |  | 1 | 1 |  |  |  |
Restructured loans discontinued past due period |  |  |  | 90 days | 90 days |  |  |  |
Remaining availability under commitments to lend additional funds on restructured loans | $ 0 |  | $ 1,000 | $ 0 | $ 1,000 |  |  |  |
Number of loan modifications | loan | 8 |  | 1 | 34 | 6 |  |  |  |
Modified loans, balance | $ 832,000 |  | $ 16,000 | $ 7,802,000 | $ 508,000 |  |  |  |
Non purchased loans and leases | Loan deferral | Loan Deferral Program, CARES Act |  |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Initial deferral period |  | 90 days |  |  |  |  |  |  |
Second deferral period |  | 90 days |  |  |  |  |  |  |
Number of loan modifications | loan |  |  |  | 804 |  |  |  |  |
Modified loans, balance |  |  |  | $ 373,000,000 |  |  |  |  |
Non purchased loans and leases | Nonaccruing Loans |  |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Outstanding balance of restructured loans | 92,000 |  | 40,000 | 92,000 | 40,000 |  |  |  |
Non purchased loans and leases | Restructured loans |  |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Outstanding balance of restructured loans | 3,703,000 |  | 3,101,000 | 3,703,000 | 3,101,000 |  |  |  |
Allowance for loan losses attributable to restructured loans | $ 279,000 |  | $ 30,000 | $ 279,000 | $ 30,000 |  |  |  |

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