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Portfolio Loans - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
financing receivable, paycheck protection program |  | $ 709,900 |  |  |
financing receivable, paycheck protection program, net of deferred fees |  | 698,600 |  |  |
financing recievable, paycheck protection program, unearned fees |  | 11,300 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available |  | 2,500,000 |  |  |
net premium, acquired loans |  | 16,100 |  |  |
net discount, acquired loans |  | 36,000 |  |  |
Allowance for credit losses on loans |  |  | $ 43,288 |  |
financing receivable, amount eligible for deferred payment |  | 687,800 |  |  |
Financing Receivable, Amount Eligible for Deferral of Both Principal and Interest |  | 340,000 |  |  |
financing receivable, amount eligible for deferral of principal only |  | 347,800 |  |  |
Financing Receivable, Amount Still in Deferral Status |  | 63,000 |  |  |
Loans and Leases Receivable, Deferred Income |  | 4,100 |  |  |
Allowance for Credit Losses, Qualitative Adjustment |  | 24,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 28,387 |  |  |
enterprise value lending portfolio niche segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for Credit Losses, Qualitative Adjustment |  | 11,100 |  |  |
Non-Covered Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses on loans | $ 69,995 | 136,671 | 42,567 | $ 42,295 | $ 38,166
CECL adoption | 28,387 |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 1,680 | 63,400 | $ 6,700 |  |
financing receivable, allowance for credit loss, threshold of loans written off | $ 100 |  |  |  |
Non-Covered Loans | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 5,900 |  |  |
Non-Covered Loans | enterprise value lending portfolio niche segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 19,000 |  |  |
Unadvanced Commitment on Impaired Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Estimated losses attributable to unadvanced commitments on impaired loans |  | $ 5,700 |  |  |

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