Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Additions	$ 3,657	$ 13,080	$ 11,759
Servicing asset:
Balance at beginning of period	37,267	30,085	28,124
Additions	3,657	13,080	11,759
Amortization	(5,135)	(5,898)	(9,798)
Balance before valuation allowance at end of period	35,789	37,267	30,085
Valuation allowance:
Balance at beginning of period	0	(46)	(1,407)
(Additions)/recoveries	0	46	1,361
Balance at end of period	0	0	(46)
Loan servicing rights, net	$ 35,789	37,267	$ 30,039
First Midwest
Servicing Assets at Fair Value [Line Items]
Additions		7,700
Servicing asset:
Additions		$ 7,700