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Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) reporting_unit loan | Jan. 01, 2021 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Deferral period for payment deferrals |  | 90 days |  |  |  |
Remaining payment deferrals |  | $ 16,600 |  |  |  |
PPP loans originations | $ 245,000 |  |  |  |  |
PPP forgiveness payoffs |  | $ 4,000 |  |  |  |
Number of PPP loans outstanding | loan |  | 2,676 |  |  |  |
Amount of PPP loans outstanding |  | $ 241,000 |  |  |  |
SBA loans held for sale |  | $ 6,077 |  | $ 0 |  |
SBA loan, amortization period |  | 25 years |  |  |  |
Other Investments |  | $ 7,800 |  | 8,000 |  |
Number of reporting units | reporting_unit |  | 3 |  |  |  |
Goodwill |  | $ 239,272 |  | 234,368 |  |
Allowance for credit losses |  | $ 52,388 |  | $ 21,398 | $ 21,039 | $ 23,298
Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Premises and equipment, useful life |  | 2 years |  |  |  |
Identifiable intangible assets, useful life |  | 7 years |  |  |  |
Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Premises and equipment, useful life |  | 40 years |  |  |  |
Identifiable intangible assets, useful life |  | 10 years |  |  |  |
Forecast | Accounting Standards Update 2016-13 | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  | $ 12,000 |  |  |
Forecast | Accounting Standards Update 2016-13 | Minimum | Unfunded Loan Commitment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Reserve |  |  | 6,000 |  |  |
Forecast | Accounting Standards Update 2016-13 | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  | 14,000 |  |  |
Forecast | Accounting Standards Update 2016-13 | Maximum | Unfunded Loan Commitment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Reserve |  |  | $ 7,000 |  |  |
First Bank |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Goodwill |  | $ 227,600 |  |  |  |
First Bank Insurance |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Goodwill |  | 7,400 |  |  |  |
SBA |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Goodwill |  | $ 4,300 |  |  |  |

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