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Loans and Lease Receivables - Estimated Fair Value of Impaired Loans Acquired at Acquisition (Details) - Acquired Impaired Loans - USD ($) | Dec. 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | May 31, 2018
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Estimated fair value of impaired loans acquired at acquisition | $ 0 |  | $ 0 |
Oak Park River Forest Bankshares, Inc. |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Undiscounted contractual cash flows |  | $ 74,092,000 |  |
Undiscounted cash flows not expected to be collected (non-accretable difference) |  | 11,401,000 |  |
Undiscounted cash flows expected to be collected |  | 62,691,000 |  |
Accretable yield at acquisition |  | (9,764,000) |  |
Estimated fair value of impaired loans acquired at acquisition |  | $ 52,927,000 |  |
First Evanston Bancorp, Inc. |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Undiscounted contractual cash flows |  |  |  | $ 33,594,000
Undiscounted cash flows not expected to be collected (non-accretable difference) |  |  |  | 5,003,000
Undiscounted cash flows expected to be collected |  |  |  | 28,591,000
Accretable yield at acquisition |  |  |  | (3,566,000)
Estimated fair value of impaired loans acquired at acquisition |  |  |  | $ 25,025,000

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