Capital Stock - Textual (Details) - USD ($)		1 Months Ended	3 Months Ended
	Oct. 29, 2019	May 07, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 05, 2020	Dec. 31, 2019	Oct. 22, 2019	Jul. 23, 2012	Feb. 27, 2009
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			40,040,000			40,040,000			40,040,000
Preferred stock, par value (in dollars per share)			$ 0.01			$ 0.01			$ 0.01
Preferred stock, shares issued (in shares)			767			767
Number of shares authorized to be repurchased (in shares)					180,000,000		60,000,000	1,700,000
Stock repurchases (in shares)			4,922,336	0
Stock repurchases, average price			$ 18.96
Maximum
Class of Stock [Line Items]
Preferred stock, liquidation preference, value									$ 80,000,000
Reliance Bancshares, Inc. | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	40,000
Preferred stock, par value (in dollars per share)	$ 0.01
Reliance Bancshares, Inc. | Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	2,000.02
Preferred stock, par value (in dollars per share)	$ 0.01
Reliance Bancshares, Inc. | Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, dividend rate, percentage	7.00%
Reliance Bancshares, Inc. | Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	140
Preferred stock, shares issued (in shares)	0
Reliance Bancshares, Inc. | Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.01
Subsequent Event
Class of Stock [Line Items]
Stock repurchases (in shares)		0