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Allowance for Loan Losses - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 32,708,937 | [1] | $ 29,712,810 | $ 32,708,937 | [1] | $ 29,712,810 |  | $ 31,061,111 | [1] |  |
Allowance for loan losses | 537,881 |  | 192,749 | $ 537,881 |  | 192,749 | $ 444,490 | 200,307 |  | $ 184,911 | $ 180,424
Forecast period to estimate expected credit losses |  |  |  | 4 years |  |  |  |  |  |  |
Term to estimate expected credit losses determined by macroeconomics variable |  |  |  | 3 years |  |  |  |  |  |  |
Additional term to estimated expected credit losses determined by microeconomics variable diminishing |  |  |  | 1 year |  |  |  |  |  |  |
Measurement period of historical losses, pro rata period |  |  |  | 1 year |  |  |  |  |  |  |
Expense/(Credit) on unfunded commitments | 11,158 |  | (489) | $ 20,388 |  | (93) |  |  |  |  |
Consumer real estate | C&I |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  | 3 years |  |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  | 158,598 |  |  |
Commercial | C&I |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | 21,393,893 |  | 19,054,269 | $ 21,393,893 |  | 19,054,269 |  | 20,051,091 |  |  |
Allowance for loan losses | 318,722 |  | $ 116,096 | $ 318,722 |  | $ 116,096 | $ 254,516 | 122,486 |  | $ 103,713 | $ 98,947
HELOC and R/E Installment Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  | 5 years |  |  |  |  |  |  |
General C&I |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collateral for secured borrowings | 65,000 |  |  | $ 65,000 |  |  |  |  |  |  |
Collateral, charge off | 1,500 |  |  | 13,000 |  |  |  |  |  |  |
General C&I | Commercial | C&I |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | 17,164,125 |  |  | 17,164,125 |  |  |  | $ 15,395,996 |  |  |
HELOC |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collateral for secured borrowings | 10,000 |  |  | 10,000 |  |  |  |  |  |  |
R/E Installment Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collateral for secured borrowings | 26,000 |  |  | 26,000 |  |  |  |  |  |  |
COVID-19 Deferrals |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 860 |  |  | 860 |  |  |  |  |  |  |
Paycheck Protection Plan | Commercial | C&I |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 2,100,000 |  |  | $ 2,100,000 |  |  |  |  |  |  |
[1] | June 30, 2020 and December 31, 2019 include $16.9 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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