Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income													$ 68,069	$ 74,042	$ 39,812
Preferred Stock Dividends													(7,902)	(2,036)	0
Net income to common shareholders	19,266	(6,921)	29,442	18,381	18,330	18,353	18,847	16,476	14,406	1,532	13,594	10,280	60,167	72,006	39,812
Effect of dilutive stock options, income													0
Diluted net income													$ 60,167	$ 72,006
Weighted Average Common Shares													54,647,643	53,146,416	38,579,780
Effect of dilutive stock options, number of shares													0		799
Diluted, Weighted Average Number Common Shares													54,647,643	53,146,416	38,580,579
Basic Net Income Per Common Share	$ 0.35	$ (0.13)	$ 0.54	$ 0.34	$ 0.34	$ 0.34	$ 0.35	$ 0.33	$ 0.36	$ 0.04	$ 0.34	$ 0.31	$ 1.10	$ 1.35	$ 1.03
Diluted Net Income Per Common Share	$ 0.35	$ (0.13)	$ 0.54	$ 0.34	$ 0.34	$ 0.34	$ 0.35	$ 0.33	$ 0.36	$ 0.04	$ 0.34	$ 0.31	$ 1.10	$ 1.35	$ 1.03
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					15,000