Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Apr. 27, 2022	Apr. 26, 2022	Jan. 31, 2022	Jul. 23, 2021	Jul. 22, 2021	Oct. 29, 2019	Feb. 27, 2009
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)												40,040,000
Preferred stock, par value (in dollars per share)												$ 0.01
Preferred stock, liquidation preference, value	$ 80.0		$ 80.0
Common stock, shares authorized (in shares)	350,000,000		350,000,000		350,000,000
Stock repurchases (in shares)	1,128,087	2,035,324	1,128,087	2,549,049
Stock repurchases, average price (in dollars per share)			$ 17.75
2019 Share Repurchase Program
Class of Stock [Line Items]
Stock repurchases (in shares)				513,725
Stock repurchases, average price (in dollars per share)				$ 31.25
2022 Share Repurchase Program
Class of Stock [Line Items]
Stock repurchases (in shares)				2,035,324
Stock repurchases, average price (in dollars per share)				$ 24.59
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)						350,000,000	175,000,000
Number of shares authorized to be repurchased (in shares)								175,000,000	276,500,000	180,000,000
Reliance Bancshares, Inc. | Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)											$ 0.01