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Allowance for Loan Losses - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | [1]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, net of unearned income | $ 33,378,303 | [1] | $ 27,990,048 | $ 31,061,111
Expense/(Credit) on unfunded commitments | $ 9,230 |  | $ 396 |
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 |  |  |
Consumer real estate | C&I |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted average life | 3 years |  |  |
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 | $ 32,000 |  |  |
Collateral, charge off | 6,000 |  |  |
HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collateral for secured borrowings | 10,000 |  |  |
R/E Installment Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collateral for secured borrowings | $ 23,000 |  |  |
[1] | March 31, 2020 and December 31, 2019 include $20.8 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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- Definition Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5086-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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