Other Assets and Other Liabilities Held for Sale (Details) - USD ($) $ in Thousands |
Sep. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Other assets held for sale | $ 5,136 | $ 165,780 | |
| Other liabilities held for sale | $ 424 | $ 157,366 | |
| Heartland | |||
| Business Acquisition [Line Items] | |||
| Branches and loans acquired | $ 141,000 | ||
| Deposits and liabilities | $ 154,600 |