CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning of the period, shares at Dec. 31, 2016		33,193,387
Balance, beginning of the period at Dec. 31, 2016	$ 1,305,710		$ 1,213,837	$ 95,328	$ (3,455)
Net income	60,776			60,776
Other comprehensive income (loss)	(786)				(786)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax				795	(795)
Accrual of dividends on common stock	(66,364)			(66,364)
Stock Repurchased and Retired During Period, Shares		545,166
Cash paid for repurchase of common stock	(31,045)		(31,045)
Issuance of unvested restricted common stock, net, shares		78,264
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	4,335		4,335
Balance, end of the period, shares at Dec. 31, 2017		32,726,485
Balance, end of the period at Dec. 31, 2017	1,272,626		1,187,127	90,535	(5,036)
Net income	136,515			136,515
Other comprehensive income (loss)	(16,064)				(16,064)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax				(28,204)	28,204
Accrual of dividends on common stock	(64,791)			(64,791)
Stock Repurchased and Retired During Period, Shares		594,711
Cash paid for repurchase of common stock	(34,401)		(34,401)
Issuance of unvested restricted common stock, net, shares		(57,073)
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	5,001		5,001
Balance, end of the period, shares at Dec. 31, 2018		35,182,772
Balance, end of the period at Dec. 31, 2018	1,478,595		1,337,436	134,055	7,104
Net income	146,278			146,278
Other comprehensive income (loss)	26,152				26,152
Accrual of dividends on common stock	(93,495)			93,495
Stock Repurchased and Retired During Period, Shares		1,000,000
Cash paid for repurchase of common stock	(53,922)		(53,922)
Issuance of unvested restricted common stock, net, shares		(9,547)
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	5,226		5,226
Stock Issued During Period, Shares, Acquisitions		1,578,351
Stock Issued During Period, Value, Acquisitions	85,200
Balance, end of the period, shares at Dec. 31, 2019		35,751,576
Balance, end of the period at Dec. 31, 2019	$ 1,594,034		$ 1,373,940	$ 186,838	$ 33,256