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Loans - Narrative (Details) $ in Thousands | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) loan | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 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) | $ 20,600 |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income | 4,100 |  |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | 2,800,000 |  |  | $ 2,500,000 |  |  |
Financing Receivable, Paycheck Protection Program | 408,900 |  |  | 709,900 |  |  |
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees | 396,700 |  |  |  |  |  |
Financing Receivable, Paycheck Protection Program, Unearned Fees | 12,200 |  |  |  |  |  |
financing receivable, paycheck protection program, net of deferred fees |  |  |  | 698,600 |  |  |
financing recievable, paycheck protection program, unearned fees |  |  |  | 11,300 |  |  |
Financing Receivable, Amount Still in Deferral Status | 8,500 |  |  |  |  |  |
net premium, acquired loans |  |  |  | 16,100 |  |  |
Nonperforming loan balances, excluding government guaranteed balances |  |  |  | 3,900 |  |  |
Other Assets [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | 24,600 |  |  |  |  |  |
Non-Covered Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Post-Modification Outstanding Recorded Balance |  | $ 3,886 |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan |  | 3 |  |  |  |  |
Restructured, accruing | 3,042 |  |  | 3,559 |  |  |
Loans, before unearned loan fees | 7,241,500 |  |  | 7,241,074 |  |  |
Financing receivable, allowance for credit loss | 128,185 | $ 110,270 | $ 131,527 | 136,671 | $ 92,187 | $ 69,995 | $ 43,288
Nonperforming loan balances, excluding government guaranteed balances | 3,900 |  |  |  |  |  |
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 20,100 |  |  |  |  |  |
Non-Covered Loans | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Restructured, accruing | 0 |  |  | 0 |  |  |
Loans, before unearned loan fees | 235,431 |  |  | 187,083 |  |  |
Financing receivable, allowance for credit loss | 6,958 | $ 1,729 | $ 3,400 | $ 2,787 | $ 1,547 | $ 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 | $ 12,900 |  |  |  |  |  |

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