Condensed Consolidated Statement of Changes in Stockholders Equity (USD $) In Thousands, except Share data, unless otherwise specified		Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Returned Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2012		$ 546,924	$ 35	$ 280	$ 546,065	$ 574	$ (30)
Beginning balance, Shares at Dec. 31, 2012			3,450,000	28,044,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital increase related to Equity Incentive Plan		2,065			2,065
Issuance of restricted common stock	[1]	0		0
Issuance of restricted common stock, Shares				34,361
Issuance of common stock		148,804		89	148,715
Issuance of common stock, Shares				8,805,000
Offering costs		(508)			(508)
Net income		36,621				36,621
Change in net unrealized gain on securities available-for-sale		(589)					(589)
Dividends on common stock		(44,850)				(44,850)
Dividends on preferred stock		(5,580)				(5,580)
Ending balance at Sep. 30, 2013		$ 682,887	$ 35	$ 369	$ 696,337	$ (13,235)	$ (619)
Ending balance, Shares at Sep. 30, 2013			3,450,000	36,883,467

[1] Rounds to zero.