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Loans - Concentrations and Restrictions (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Consumer | Residential Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percentage | 23.00% |
Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percentage | 22.00% |
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 21,123,055 | $ 20,545,198
Commercial | Finance And Insurance Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 2,600,000 |
Percentage of commercial & industrial loan portfolio | 15.00% |
Percentage contributed in total loan | 9.00% |
Commercial | Loans To Mortgage Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 2,300,000 |
Percentage of commercial & industrial loan portfolio | 13.00% |
Percentage contributed in total loan | 8.00% |
Commercial | Finance Insurance And Loans To Mortgage Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of commercial & industrial loan portfolio | 28.00% |

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