Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Held to maturity securities, fair value	$ 1,106,582	$ 1,118,966
Loans held for sale at fair value	85,516	82,192
Allowance for credit losses on loans	$ 51,838	$ 44,014
Stockholders' Equity:
Common stock, without par value (in dollars per share)
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	43,233,618	43,113,127
Common stock, shares outstanding	43,233,618	43,113,127
Preferred stock, shares authorized	5,000,000	5,000,000
7% Series A Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (as a percent)	7.00%	7.00%
Preferred stock liquidation preference (in dollars per share)	$ 25	$ 25
Preferred stock, shares authorized	3,500,000	3,500,000
Preferred stock, shares issued	2,081,800	2,081,800
Preferred stock, shares outstanding	2,081,800	2,081,800
6% Series B Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (as a percent)	6.00%	6.00%
Preferred stock liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized	125,000	125,000
Preferred stock, shares issued	125,000	125,000
Preferred stock, shares outstanding	125,000	125,000
Depositary shares	5,000,000	5,000,000
6% Series C Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (as a percent)	6.00%	6.00%
Preferred stock liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares issued	196,181	196,181
Preferred stock, shares outstanding	196,181	196,181
Depositary shares	7,847,233	7,847,233
8.25% Series D Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (as a percent)	8.25%	8.25%
Preferred stock liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized	300,000	300,000
Preferred stock, shares issued	142,500	142,500
Preferred stock, shares outstanding	142,500	142,500
Depositary shares	5,700,000	5,700,000