Consolidated Statements of Stockholders' Equity - Unaudited - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Performance Based Restricted Stock Units and Stock, Restricted Stock Units and Restricted Stock Awards	Performance Based Restricted Stock Units and Stock, Restricted Stock Units and Restricted Stock Awards Additional Paid-in Capital
Beginning balance (in shares) at Dec. 31, 2018		1,200,000	45,074,322
Beginning balance at Dec. 31, 2018	$ 490,336	$ 12	$ 451	$ 454,512	$ 38,371	$ (3,010)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,350				9,350
Change in unrealized appreciation on available-for-sale securities	9,298					9,298
Issuance of shares (in shares)			101,203
Issuance of shares	827		$ 1	826
Issuance of shares from equity based awards (in shares)			36,845
Issuance of shares from equity-based awards	(134)			(134)
Retired shares (in shares)		(1,200,000)	(10,000)
Retired shares	(30,155)	$ (12)		(30,088)	(55)
Preferred dividends declared	(175)				(175)
Employee receivables from sale of stock	32			2	30
Share-based compensation							$ 1,098	$ 1,098
Employee stock purchase plan additions	37			37
Ending balance (in shares) at Mar. 31, 2019		0	45,202,370
Ending balance at Mar. 31, 2019	480,514	$ 0	$ 452	428,412	45,293	6,357
Beginning balance (in shares) at Dec. 31, 2019		0	51,969,203
Beginning balance at Dec. 31, 2019	601,644	$ 0	$ 520	519,870	64,803	16,451
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,857				3,857
Change in unrealized appreciation on available-for-sale securities	6,151					6,151
Issuance of shares from equity based awards (in shares)			128,859
Issuance of shares from equity-based awards	(670)		$ 1	(671)
Employee receivables from sale of stock	30			1	29
Share-based compensation							$ 934	$ 934
Ending balance (in shares) at Mar. 31, 2020		0	52,098,062
Ending balance at Mar. 31, 2020	$ 611,946	$ 0	$ 521	$ 520,134	$ 68,689	$ 22,602