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Loans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructurings loans | $ 194,700 | $ 206,300 |  |
Allowance for loan losses | $ 444,490 | 200,307 | $ 184,911 | $ 180,424
Loans to Mortgage Companies |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of loans collateralized with government guaranteed loans | 90.00% |  |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 13,900 | $ 19,700 |  |
Ratio of the allowance for loan losses to loans | 7.00% | 10.00% |  |
Loans Held For Sale, Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructurings loans | $ 50,500 | $ 51,100 |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance - purchased credit-impaired loans |  | 848 |  |
Allowance for loan losses |  | 158,598 |  |
Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modified interest rate increase | 1.00% |  |  |
TDRS Maturities | 40 years |  |  |
Allowance for loan losses | $ 123,022 | 28,443 | 34,154 | 37,439
Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 19,327 | 13,266 | 12,662 | $ 12,727
Consumer | Permanent Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR, reduction of interest rate by increment, basis points | 0.25% |  |  |
Minimum | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Forbearance agreements time period | 6 months |  |  |
Minimum | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modified interest rate | 2.00% |  |  |
Modified interest rate time period | 5 years |  |  |
Maximum | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Forbearance agreements time period | 12 months |  |  |
Maximum | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modified interest rate time period | 5 years |  |  |
TRUPS |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Small Bank And Business Loan, Total Asset Maximum Cap | $ 15,000,000 |  |  |
Heloc And Real Estate Installment Classes | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR, reduction of interest rate by increment, basis points | 0.25% |  |  |
Modified interest rate increase | 2.00% |  |  |
Heloc And Real Estate Installment Classes | Minimum | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modified interest rate | 1.00% |  |  |
Modified interest rate time period | 5 years |  |  |
Heloc And Real Estate Installment Classes | Maximum | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modified interest rate time period | 5 years |  |  |
Credit Card | Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit card workout program, granted rate reduction | 0.00% |  |  |
Credit Card | Minimum | Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Payment reductions, time period | 6 months |  |  |
Credit Card | Maximum | Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Payment reductions, time period | 1 year |  |  |
Credit card workout program, term extension | 5 years |  |  |
Purchased credit-impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance - purchased credit-impaired loans |  | 2,000 |  |
Allowance for loan losses |  |  | 3,413 |
Allowance for Loan and Lease Losses Write-offs, Net |  | 5,800 |  |
Provision for Loan, Lease, and Other Losses |  | $ 1,300 |  |
Purchased credit-impaired loans | Consumer | Consumer Real Estate (a) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses |  |  | 1,123 |
Purchased credit-impaired loans | Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses |  |  | $ 149 |

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