Subordinated Notes and Junior Subordinated Debentures - Junior Subordinated Debentures by Issuance (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2024	Dec. 31, 2023
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		$ 87,000	$ 87,000
Total liability, at carrying value		70,675	70,452
Metropolitan Statutory Trust 1
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		35,000	35,000
First Evanston Bancorp Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		10,000	10,000
AmeriMark Capital Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		5,000	5,000
Inland Bancorp Trust II
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		10,000	10,000
Inland Bancorp Trust III
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		10,000	10,000
Inland Bancorp Trust IV
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		7,000	7,000
Inland Bancorp Trust V
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		10,000	10,000
Junior Subordinated Debentures
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Discount		$ (16,325)	$ (16,548)
Junior Subordinated Debentures | Metropolitan Statutory Trust 1
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Mar. 17, 2034
Contractual Rate		8.39%	8.43%
Junior Subordinated Debentures | Metropolitan Statutory Trust 1 | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 2.79%
Interest Rate Spread	[1]	2.79%
Junior Subordinated Debentures | First Evanston Bancorp Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Mar. 15, 2035
Contractual Rate		7.38%	7.43%
Junior Subordinated Debentures | First Evanston Bancorp Trust I | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 1.78%
Interest Rate Spread	[1]	1.78%
Junior Subordinated Debentures | AmeriMark Capital Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Apr. 23, 2034
Contractual Rate		8.34%
Junior Subordinated Debentures | AmeriMark Capital Trust I | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 2.75%
Interest Rate Spread	[1]	2.75%
Junior Subordinated Debentures | Inland Bancorp Trust II
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Sep. 15, 2035
Contractual Rate		7.20%
Junior Subordinated Debentures | Inland Bancorp Trust II | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 1.60%
Interest Rate Spread	[1]	1.60%
Junior Subordinated Debentures | Inland Bancorp Trust III
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Dec. 15, 2036
Contractual Rate		7.25%
Junior Subordinated Debentures | Inland Bancorp Trust III | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 1.65%
Interest Rate Spread	[1]	1.65%
Junior Subordinated Debentures | Inland Bancorp Trust IV
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Jun. 06, 2037
Contractual Rate		7.22%
Junior Subordinated Debentures | Inland Bancorp Trust IV | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 1.62%
Interest Rate Spread	[1]	1.62%
Junior Subordinated Debentures | Inland Bancorp Trust V
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity		Sep. 15, 2037
Contractual Rate		7.02%
Junior Subordinated Debentures | Inland Bancorp Trust V | SOFR + spread adjustment
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	[1]	SOFR + spread adjustment + 1.42%
Interest Rate Spread	[1]	1.42%

[1] (1) SOFR is three-month SOFR and the spread adjustment is 0.26161%