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Non Purchased Loans - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($) loan | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses attributable to restructured loans | $ 120,185,000 | $ 145,387,000 | $ 50,059,000 | $ 145,387,000 | $ 50,059,000 | $ 52,162,000 | $ 49,835,000 | $ 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 |  |  |  | $ 37,000 |  |  |  |
Troubled debt restructured that has subsequently defaulted |  |  |  | $ 0 | $ 0 |  |  |
Nonperforming loans charged-off past due period |  |  |  | 90 days |  |  |  |
Number of restructured loans | loan |  |  |  | 3 | 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 |  | 21 | 5 | 26 | 5 |  |  |
Modified loans, balance |  | $ 5,627,000 | $ 492,000 | $ 6,971,000 | $ 492,000 |  |  |
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 |  |  |  | 3,500 |  |  |  |
Modified loans, balance |  |  |  | $ 1,579,000,000 |  |  |  |
Non purchased loans and leases | Nonaccruing Loans |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Outstanding balance of restructured loans |  | 352,000 | 37,000 | 352,000 | 37,000 |  |  |
Non purchased loans and leases | Restructured loans |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Outstanding balance of restructured loans |  | 2,306,000 | 3,288,000 | 2,306,000 | 3,288,000 |  |  |
Allowance for loan losses attributable to restructured loans |  | $ 299,000 | $ 30,000 | $ 299,000 | $ 30,000 |  |  |

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