Condensed Consolidated Statement 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	Retained Earnings 7% Series A Preferred Stock	Retained Earnings 6% Series B Preferred Stock	Retained Earnings 6% Series C Preferred Stock	Retained Earnings 8.25% Series D Preferred Stock	Retained Earnings Impact from adoption of ASU	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at beginning of the period (ASU 2016-13) at Dec. 31, 2021										$ (3,648)
Balance at beginning of the period (ASU 2016-02) at Dec. 31, 2021										$ (110)
Balance at beginning of the period at Dec. 31, 2021	$ 137,565	$ 50,221	$ 120,844	$ 191,084							$ 657,149	$ (1,454)
Balance at beginning of the period (in shares) at Dec. 31, 2021	43,180,079	2,081,800	125,000	196,181
Consolidated Statements of Shareholders' Equity
Net income											50,142		$ 50,142
Dividends on 7% preferred stock, annually						$ (910)
Dividends on 6% preferred stock, annually							$ (1,875)	$ (2,943)
Dividends on common stock, annually											(3,029)
Other comprehensive loss												(4,850)	(4,850)
Cash paid in lieu of fractional shares for stock split	$ (1)
Cash paid in lieu of fractional shares for stock split (in shares)	(29)
Distribution to employee stock ownership plan	$ 653
Distribution to employee stock ownership plan (in shares)	20,709
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations	$ (335)
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations (in shares)	67,017
Balance at end of the period at Mar. 31, 2022	$ 137,882	$ 50,221	$ 120,844	$ 191,084							694,776	(6,304)	1,188,503
Balance at end of the period (in shares) at Mar. 31, 2022	43,267,776	2,081,800	125,000	196,181
Balance at beginning of the period at Dec. 31, 2022	$ 137,781	$ 50,221	$ 120,844	$ 191,084							832,871	(10,521)	1,459,739
Balance at beginning of the period (in shares) at Dec. 31, 2022	43,113,127	2,081,800	125,000	196,181
Consolidated Statements of Shareholders' Equity
Net income											54,955		54,955
Dividends on 7% preferred stock, annually						$ (910)
Dividends on 6% preferred stock, annually							$ (1,875)	$ (2,943)
Dividends 8.25 Percent Series D Preferred Stock									$ (2,939)
Dividends on common stock, annually											(3,459)
Other comprehensive loss												2,792	2,792
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	$ (486)
Shares issued for stock compensation plans, net of taxes withheld to satisfy tax obligations (in shares)	87,198
Balance at end of the period at Mar. 31, 2023	$ 138,105	$ 50,221	$ 120,844	$ 191,084	$ 137,459						$ 875,700	$ (7,729)	$ 1,505,684
Balance at end of the period (in shares) at Mar. 31, 2023	43,233,618	2,081,800	125,000	196,181	142,500