Business Developments - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 31, 2022 shares	Apr. 19, 2021 shares	Dec. 31, 2021 USD ($) $ / shares shares	Oct. 30, 2020 USD ($)	Dec. 16, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Preferred stock, shares authorized | shares			3,000,000
Value per share (in dollars per share)			$ 0.01
Merger-related expenses | $			$ 37,500
Sterling
Restructuring Cost and Reserve [Line Items]
Share exchange ratio		0.4630
Preferred stock, shares authorized | shares		200,000,000
Aggregate principal amount | $				$ 225,000	$ 274,000
Fixed-to-floating rate				3.875%	4.00%
Subsequent Event | Sterling
Restructuring Cost and Reserve [Line Items]
Preferred stock, shares authorized | shares	400,000,000
Shares issued (in shares) | shares	135,000
Series A Preferred Stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate (as a percent)			6.50%
Series G Preferred Stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate (as a percent)			6.50%
Value per share (in dollars per share)			$ 0.01
Preferred stock, liquidation preference per share (in usd per share)			1,000
Preferred Stock [Member]
Restructuring Cost and Reserve [Line Items]
Value per share (in dollars per share)			$ 25
Series F Preferred Stock [Member]
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate (as a percent)			5.25%
Value per share (in dollars per share)			$ 0.01
Preferred stock, liquidation preference per share (in usd per share)			$ 25,000