Parent Company Financial Information (Condensed Statements of Income) (Details) (USD $) In Thousands, 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, 2013	Dec. 31, 2012	Dec. 31, 2011
Expense
Compensation and employee benefits									$ 125,432	$ 85,434	$ 81,552
Long-term obligations									0	0	579
Other borrowings									734	479	498
Other expense									29,684	21,015	17,154
Income (loss) before income taxes	27,884	20,010	22,005	17,111	18,804	16,535	16,266	12,100	87,010	63,705	65,942
Income tax expense (benefit)	7,911	6,734	7,414	4,935	5,342	4,655	4,367	3,198	26,994	17,562	17,905
Net Income (Loss)	19,973	13,276	14,591	12,176	13,462	11,880	11,899	8,902	60,016	46,143	48,037
Parent [Member]
Income
Dividend from banking subsidiaries									183,000	48,950	0
Interest-earning deposits									68	153	712
Other income									7	0	17
Total Income									183,075	49,103	729
Expense
Compensation and employee benefits									658	182	88
Long-term obligations									0	0	579
Other borrowings									258	0	0
Other expense									4,162	1,193	1,114
Total Expenses									5,078	1,375	1,781
Income (loss) before income taxes									177,997	47,728	(1,052)
Income tax expense (benefit)									(1,552)	(435)	91
Income before equity in undistributed net income (loss) of subsidiaries									179,549	48,163	(1,143)
Equity in undistributed net income (loss) of subsidiaries									(119,533)	(2,020)	49,180
Net Income (Loss)									$ 60,016	$ 46,143	$ 48,037