Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock Voting	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Impact of ASC 326 Adoption	Impact of ASC 326 Adoption Retained Earnings
Beginning Balance at Dec. 31, 2018	$ 945,534	$ 231,128	$ 518	$ 5	$ 625,834	$ 140,952	$ (28,786)	$ (24,117)
Comprehensive income (loss):
Net (loss) income	9,487					9,487
Other comprehensive income, net	14,546							14,546
Issuance of common stock	0		2		(2)
Redemption of preferred stock	(46,396)	(41,303)				(5,093)
Share-based compensation expense	3,844				3,844
Restricted stock surrendered due to employee tax liability	(902)				(902)
Shares purchased under the Dividend Reinvestment Plan	(99)					(99)
Stock appreciation right dividend equivalents	(390)					(390)
Dividends declared	(12,617)					(12,617)
Preferred stock dividends	(12,019)					(12,019)
Ending Balance at Sep. 30, 2019	900,988	189,825	520	5	628,774	120,221	(28,786)	(9,571)
Beginning Balance at Dec. 31, 2018	945,534	231,128	518	5	625,834	140,952	(28,786)	(24,117)
Ending Balance at Dec. 31, 2019	$ 907,245	189,825	520	5	629,848	127,733	(28,786)	(11,900)	$ (4,503)	$ (4,503)
Comprehensive income (loss):
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Jun. 30, 2019	$ 963,544	231,128	520	5	627,306	146,039	(28,786)	(12,668)
Comprehensive income (loss):
Net (loss) income	(14,132)					(14,132)
Other comprehensive income, net	3,097							3,097
Redemption of preferred stock	(46,396)	(41,303)				(5,093)
Share-based compensation expense	1,494				1,494
Restricted stock surrendered due to employee tax liability	(26)				(26)
Shares purchased under the Dividend Reinvestment Plan	(23)					(23)
Stock appreciation right dividend equivalents	(94)					(94)
Dividends declared	(3,073)					(3,073)
Preferred stock dividends	(3,403)					(3,403)
Ending Balance at Sep. 30, 2019	900,988	189,825	520	5	628,774	120,221	(28,786)	(9,571)
Beginning Balance at Dec. 31, 2019	907,245	189,825	520	5	629,848	127,733	(28,786)	(11,900)	$ (4,503)	$ (4,503)
Comprehensive income (loss):
Net (loss) income	(9,129)					(9,129)
Other comprehensive income, net	13,166							13,166
Issuance of common stock	0		2		(2)
Redemption of preferred stock	(4,379)	(4,947)				568
Purchase of treasury shares	(12,041)						(12,041)
Share-based compensation expense	4,392				4,392
Restricted stock surrendered due to employee tax liability	(829)				(829)
Shares purchased under the Dividend Reinvestment Plan	(74)					(74)
Stock appreciation right dividend equivalents	(282)					(282)
Dividends declared	(8,890)					(8,890)
Preferred stock dividends	(10,422)					(10,422)
Ending Balance at Sep. 30, 2020	$ 874,254	184,878	522	5	633,409	95,001	(40,827)	1,266
Comprehensive income (loss):
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Jun. 30, 2020	$ 846,959	185,037	522	5	632,117	85,670	(40,827)	(15,565)
Comprehensive income (loss):
Net (loss) income	15,913					15,913
Other comprehensive income, net	16,831							16,831
Redemption of preferred stock	(166)	(159)				(7)
Share-based compensation expense	1,346				1,346
Restricted stock surrendered due to employee tax liability	(54)				(54)
Shares purchased under the Dividend Reinvestment Plan	(27)					(27)
Stock appreciation right dividend equivalents	(94)					(94)
Dividends declared	(3,007)					(3,007)
Preferred stock dividends	(3,447)					(3,447)
Ending Balance at Sep. 30, 2020	$ 874,254	$ 184,878	$ 522	$ 5	$ 633,409	$ 95,001	$ (40,827)	$ 1,266