Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common stock	Preferred stock 7% Series A Preferred Stock	Preferred stock 6% Series B Preferred Stock	Preferred stock 6% Series C Preferred Stock	Preferred stock 8.25% Series D Preferred Stock	Preferred stock 7.625% Series E Preferred Stock	Retained Earnings 7% Series A Preferred Stock	Retained Earnings 6% Series B Preferred Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance beginning of period at Dec. 31, 2022	$ 137,781	$ 50,221	$ 120,844						$ 832,871	$ (10,521)
Balance beginning of period (in shares) at Dec. 31, 2022	43,113,127	2,081,800	125,000
Consolidated Statements of Shareholders' Equity
Distribution to employee stock ownership plan	$ 810
Distribution to employee stock ownership plan (in shares)	33,293
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations	$ 1,774
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations (in shares)	96,508
Net Income (Loss)									279,234		$ 279,234
Dividends on 7% Series A preferred stock, $1.75 per share, annually									(3,643)
Dividends on 6% Series B preferred stock, $60.00 per share, annually									(7,500)
Dividends on 6% Series C preferred stock, $60.00 per share, annually									(11,771)
Dividends on 8.25% Series D preferred stock, $82.50 per share, annually									(11,756)
Dividends on common stock,$0.40 per share, annually in 2025, $0.36 per share, annually in 2024 and $0.32 per share, annually in 2023									(13,836)
Other comprehensive income										8,033	8,033
Balance end of period at Dec. 31, 2023	$ 140,365	$ 50,221	$ 120,844	$ 191,084	$ 137,459				1,063,599	(2,488)	1,701,084
Balance end of period (in shares) at Dec. 31, 2023	43,242,928	2,081,800	125,000	196,181	142,500
Consolidated Statements of Shareholders' Equity
Distribution to employee stock ownership plan	$ 997
Distribution to employee stock ownership plan (in shares)	23,414
Issuance of common stock, net of $5.5 million in offering expenses	$ 97,655					$ 222,748
Issuance of common stock, net of $5.5 million in offering expenses (in shares)	2,400,000					230,000
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations	$ 1,296
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations (in shares)	100,824
Net Income (Loss)									320,386		320,386
Dividends on 7% Series A preferred stock, $1.75 per share, annually									(910)
Dividends on 6% Series B preferred stock, $60.00 per share, annually									(8,669)
Dividends on 6% Series C preferred stock, $60.00 per share, annually									(11,772)
Dividends on 8.25% Series D preferred stock, $82.50 per share, annually									(11,756)
Dividends on 7.625% Series E preferred stock, $76.25 per share, annually									(1,802)
Dividends on common stock,$0.40 per share, annually in 2025, $0.36 per share, annually in 2024 and $0.32 per share, annually in 2023									(16,258)
Redemption of preferred stock		$ (50,221)					$ (1,823)
Redemption of preferred stock (in shares)		(2,081,800)
Other comprehensive income										2,355	2,355
Balance end of period at Dec. 31, 2024	$ 240,313		$ 120,844	$ 191,084	$ 137,459	$ 222,748			1,330,995	(133)	2,243,310
Balance end of period (in shares) at Dec. 31, 2024	45,767,166		125,000	196,181	142,500	230,000
Consolidated Statements of Shareholders' Equity
Distribution to employee stock ownership plan	$ 1,124
Distribution to employee stock ownership plan (in shares)	30,802
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations	$ 1,873
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations (in shares)	95,204
Net Income (Loss)									218,770		218,770
Dividends on 6% Series C preferred stock, $60.00 per share, annually									(11,771)
Dividends on 8.25% Series D preferred stock, $82.50 per share, annually									(11,756)
Dividends on 7.625% Series E preferred stock, $76.25 per share, annually									(17,535)
Dividends on common stock,$0.40 per share, annually in 2025, $0.36 per share, annually in 2024 and $0.32 per share, annually in 2023									(18,356)
Redemption of preferred stock			$ (120,844)					$ (4,156)
Redemption of preferred stock (in shares)			(125,000)
Other comprehensive income										100	100
Balance end of period at Dec. 31, 2025	$ 243,310			$ 191,084	$ 137,459	$ 222,748			$ 1,486,191	$ (33)	$ 2,280,759
Balance end of period (in shares) at Dec. 31, 2025	45,893,172			196,181	142,500	230,000