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Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) |  | $ 4,100 |  | $ 16,100 |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available |  | 2,700,000 |  | 2,500,000 |  |  |  |
Financing Receivable, Paycheck Protection Program |  | 446,400 |  | 709,900 |  |  |  |
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees |  | 439,000 |  | 698,600 |  |  |  |
Financing Receivable, Paycheck Protection Program, Unearned Fees |  | 7,400 |  | 11,300 |  |  |  |
Nonperforming loan balances, excluding government guaranteed balances |  |  |  | 5,400 |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest receivable |  | 31,600 |  | 31,100 |  |  |  |
Non-Covered Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Post-Modification Outstanding Recorded Balance | $ 3,933 |  | $ 7,819 |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 3 |  | 6 |  |  |  |  |
Restructured, accruing |  | 2,947 |  | 3,559 |  |  |  |
Loans, before unearned loan fees |  | 9,126,796 |  | 7,241,074 |  |  |  |
Financing receivable, allowance for credit loss | $ 123,270 | 152,096 | $ 123,270 | 136,671 | $ 128,185 | $ 110,270 | $ 69,995 | $ 43,288
Nonperforming loan balances, excluding government guaranteed balances |  | 5,100 |  |  |  |  |  |
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss |  | 17,200 |  |  |  |  |  |
Non-Covered Loans | Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Restructured, accruing |  | 0 |  | 0 |  |  |  |
Loans, before unearned loan fees |  | 270,037 |  | 187,083 |  |  |  |
Financing receivable, allowance for credit loss | $ 2,008 | 5,566 | $ 2,008 | $ 2,787 | $ 6,958 | $ 1,729 | $ 1,050 | $ 1,134
Non-Covered Loans | Agriculture Portfolio Niche Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss |  | 19,000 |  |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss |  | $ 18,300 |  |  |  |  |  |

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