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Loans and Lease Receivables - Additional Information (Details) - USD ($)	Dec. 31, 2019	Apr. 30, 2019	Dec. 31, 2018	May 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 3,780,636,000		$ 3,499,463,000
Loans held for sale pledged as security for borrowings	1,800,000,000		1,400,000,000
Allowance for loan and lease losses	31,936,000		25,201,000		$ 16,706,000	$ 10,923,000
Acquired Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans acquired	0		0
Allowance for loan and lease losses	2,800,000		2,700,000
Acquired Impaired Loans | First Evanston Bancorp, Inc.
Accounts Notes And Loans Receivable [Line Items]
Loans acquired				$ 25,025,000
Acquired Impaired Loans | Oak Park River Forest Bankshares, Inc.
Accounts Notes And Loans Receivable [Line Items]
Loans acquired		$ 52,927,000
Acquired Non-Impaired Loans and Leases | Oak Park River Forest Bankshares, Inc.
Accounts Notes And Loans Receivable [Line Items]
Loans acquired	204,500,000
Acquired Non-Impaired Loans and Leases | First Evanston
Accounts Notes And Loans Receivable [Line Items]
Loans acquired	891,000,000
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	6,484,000		13,675,000
Overdraft deposits reclassified as loans	852,000		1,700,000
Allowance for loan and lease losses	50,000		49,000		$ 41,000	$ 334,000
U.S. Government Guaranteed Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 119,800,000		$ 108,700,000

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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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Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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