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Borrowings - Additional information (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Feb. 24, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2025 USD ($) item	Jul. 01, 2025 USD ($)	Dec. 31, 2024 USD ($)
Borrowings
Number of customers having secured balances exceeding specified percentage of stockholders equity | item			0
Threshold percentage of stockholders' equity			10.00%
Borrowings at FHLBC as percentage of total assets			35.00%
FHLBC stock			$ 8,200		$ 4,500
Outstanding, net of deferred issuance costs			59,500		59,500
Proceeds from term note	$ 30,000
Asset Pledged as Collateral with Right | Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars			74,000		73,600
Bancorp Financial
Borrowings
Notes payable and other borrowings				$ 14,800
Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars			$ 24,300		36,700
Federal Home Loan Bank Advances
Borrowings
Borrowings at FHLBC as percentage of book value of certain mortgage loans			60.00%
FHLBC advance amount			$ 165,000		$ 20,000
FHLBC stock			8,200
Principal balance of loans collateralized			1,260,000
Combined collateral value			834,200
Amount available for excess collateral			$ 652,900
Subordinated Notes Due 2031
Borrowings
Face amount		$ 60,000
Interest rate (as a percent)		3.50%
Basis points added to reference rate (as a percent)		2.73%

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