Acquisition (Details) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 01, 2021	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
Liabilities
Goodwill			$ 86,478,000		$ 86,478,000
West Suburban acquired loans
Assets
Cash and due from banks	$ 16,794,000
Interest bearing deposits with financial institutions	232,880,000
Securities available-for-sale and held-to maturity, at fair value	1,067,517,000
FHLBC stock	3,340,000
Loans, net of allowance for credit losses Day One PCD loan adjustment	1,500,974,000
Premises and equipment	47,456,000
Other real estate owned	5,552,000
Core deposit intangible	14,772,000
Deferred tax assets	5,819,000
Other assets	48,838,000
Total assets	2,943,942,000
Liabilities
Noninterest bearing demand	1,070,980,000
Savings, NOW and money market	1,408,051,000
Time	215,205,000
Total deposits	2,694,236,000
Reserve for unfunded commitments	1,787,000
Other liabilities	20,629,000
Total liabilities	2,716,652,000
Cash consideration paid	100,679,000
Stock issued for acquisition	194,484,000
Total Liabilities Assumed and Cash Consideration Paid for Acquisition	3,011,815,000
Goodwill	$ 67,873,000	$ 67,700,000
Shares issued or issuable	42.413
Cash consideration for each share	$ 271.15
Merger consideration	$ 295,200,000
Common stock shares issued	15,700,000
Measurement period	1 year
Increase decrease in deferred tax assets		3,700,000
Decrease in current taxes receivable		3,900,000
Increase to goodwill		$ 146,000
Expenses related to acquisition			$ 9,100,000	$ 13,200,000
Acquisition expenses				$ 25,100,000