CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Series A Preferred dividends	Series B Preferred dividends	Preferred Stock	Common Stock	Preferred Stock	Preferred Stock Preferred Stock	Common Stock	Common Stock Common Stock	Additional Paid-in- Capital	Additional Paid-in- Capital Preferred Stock	Additional Paid-in- Capital Common Stock	Treasury Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Series A Preferred dividends	Retained Earnings Series B Preferred dividends	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2017	$ 391,698						$ 9,658		$ 209		$ 264,855			$ (1,784)	$ 119,356				$ (596)
Beginning Balance (in shares) at Dec. 31, 2017									20,820,445					91,951
Issuance of common stock, net of issuance costs (in shares)									5,405,000
Issuance of common stock, net of issuance costs	192,053								$ 54		191,999
Issuance of restricted stock awards (in shares)									65,001
Issuance of restricted stock awards	0								$ 1		(1)
Stock based compensation	2,735										2,735
Forfeiture of restricted stock awards (in shares)									2,448					2,448
Forfeiture of restricted stock awards	0										106			$ (106)
Stock option exercises, net (in shares)									1,366
Stock option exercises, net	(4)										(4)
Purchase of treasury stock (in shares)									9,664					9,664
Purchase of treasury stock	(398)													$ (398)
Preferred stock converted to common stock	0						(9,658)		$ 7		9,651
Preferred stock converted to common stock (in shares)									670,236
Preferred stock dividends			$ (273)	$ (305)													$ (273)	$ (305)
Net income	51,708														51,708
Other comprehensive income (loss)	(607)																		(607)
Ending Balance at Dec. 31, 2018	636,607						0		$ 271		469,341			$ (2,288)	170,486				(1,203)
Ending Balance (in shares) at Dec. 31, 2018									26,949,936					104,063
Issuance of restricted stock awards (in shares)									104,413
Issuance of restricted stock awards	0								$ 1		(1)
Stock based compensation	3,654										3,654
Forfeiture of restricted stock awards (in shares)									8,602					8,602
Forfeiture of restricted stock awards	0										257			$ (257)
Stock option exercises, net (in shares)									5,230
Stock option exercises, net	0
Purchase of treasury stock (in shares)									2,086,016					2,086,016
Purchase of treasury stock	(64,524)													$ (64,524)
Net income	58,544														58,544
Other comprehensive income (loss)	2,309																		2,309
Ending Balance at Dec. 31, 2019	$ 636,590	$ (1,770)					0		$ 272		473,251			$ (67,069)	229,030	$ (1,770)			1,106
Ending Balance (in shares) at Dec. 31, 2019									24,964,961					2,198,681
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Issuance of common stock, net of issuance costs (in shares)										630,268
Issuance of common stock, net of issuance costs					$ 42,364	$ 13,942		$ 45,000		$ 7		$ (2,636)	$ 13,935
Issuance of restricted stock awards (in shares)									138,417
Issuance of restricted stock awards	$ 0								$ 1		(1)
Stock based compensation	4,618										4,618
Forfeiture of restricted stock awards (in shares)									6,067					6,067
Forfeiture of restricted stock awards	0										211			$ (211)
Stock option exercises, net (in shares)									19,394
Stock option exercises, net	$ (227)										(227)
Purchase of treasury stock (in shares)	871,319								878,755					878,755
Purchase of treasury stock	$ (35,772)													$ (35,772)
Preferred stock dividends	(1,701)														(1,701)
Net income	64,024														64,024
Other comprehensive income (loss)	4,713																		4,713
Ending Balance at Dec. 31, 2020	$ 726,781						$ 45,000		$ 280		$ 489,151			$ (103,052)	$ 289,583				$ 5,819
Ending Balance (in shares) at Dec. 31, 2020									24,868,218					3,083,503