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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
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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The amount of certain loans acquired in transfer accounted for as debt securities, accretable yield at acquisition.

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Amount of cash flows not expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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