Shareholders' Equity and Regulatory Matters - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2022	Jun. 30, 2024	Dec. 31, 2023	May 25, 2023	Jul. 01, 2022
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares authorized		1,000,000	1,000,000	1,000,000
Common stock, par value		$ 1	$ 1	$ 1	$ 1
Preferred stock, par value		$ 1	$ 1	$ 1
Capital stock, shares authorized				54,500,000
Common stock, shares authorized		50,000,000	50,000,000
Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized				50,000,000
Nonvoting Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, par value		$ 1	$ 1	$ 1
Common stock, shares authorized		3,500,000	3,500,000	3,500,000
Series A Convertible Non-cumulative Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares authorized	69,400	69,400	69,400
Preferred stock, par value		$ 1	$ 1
Series B Convertible Perpetual Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares authorized	69,400	69,400	69,400
Preferred stock, par value		$ 1	$ 1
Director and Officers [Member] | Series A Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Purchase of preferred stock shares	$ 2.7
Private Placement Offering
Subsidiary, Sale of Stock [Line Items]
Liquidation preference per share	$ 1,000
Warrant exercise price of common stock per share	$ 22.5	$ 22.5
Gross proceeds before deducting placement fees and offering expenses	$ 69.4
Placement fees and offering expenses	3.2
Net proceeds after deducting placement fees and offering expenses	$ 66.2
Private Placement Offering | Series B Convertible Perpetual Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, par value	$ 1
Private Placement Offering | Series A Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares authorized	69,400