Condensed Financial Information (parent company only) - Statement of Operations (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
Income
Other income									$ 4,197	$ 1,808	$ 1,761
Expenses
Interest Expense	4,572	3,714	4,003	4,280	4,699	5,445	6,116	7,353	16,569	23,613	37,890
Salaries and Employee Benefits									85,413	79,398	74,735
Other expenses									11,142	11,505	10,475
INCOME BEFORE INCOME TAX	14,634	13,070	14,970	16,533	13,463	15,162	12,493	19,871	59,207	60,989	33,907
Income Tax Benefit	(3,187)	(2,667)	(4,155)	(4,668)	(3,153)	(3,926)	(3,288)	(5,500)	(14,677)	(15,867)	(8,655)
Loss on CPP unamortized discount											(1,401)
Loss on extinguishment of trust preferred securities											(10,857)
Preferred stock dividends and discount accretion	(241)	(430)	(852)	(857)	(1,135)	(1,134)	(1,135)	(1,135)	(2,380)	(4,539)	(3,981)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	11,206	9,973	9,963	11,008	9,175	10,102	8,070	13,236	42,150	40,583	9,013
Net income	11,447	10,403	10,815	11,865	10,310	11,236	9,205	14,371	44,530	45,122	25,252
Other Comprehensive Income (Loss)									(911)	(1,897)	6,555
Comprehensive income									43,619	43,225	31,807
Parent [Member]
Income
Dividends from Subsidiaries									63,732	30,096	4,677
Other income									45	85	(11)
Total Income									63,777	30,181	4,666
Expenses
Interest Expense									3,531	4,655	7,661
Salaries and Employee Benefits									3,284	3,194	2,688
Net Occupancy and Equipment Expenses									258	312	31
Telephone Expenses									42	30	21
Postage and Courier Expenses										1	2
Other expenses									2,617	1,502	1,501
Total Expenses									9,732	9,694	11,904
INCOME BEFORE INCOME TAX									54,045	20,487	(7,238)
Income Tax Benefit									3,153	3,316	3,256
Income (Loss) Before Equity in Undistributed Income of Subsidiaries									57,198	23,803	(3,982)
Equity in Undistributed (Distributions in Excess of) Income of Subsidiaries									(12,668)	21,319	29,234
Net Income									44,530	45,122	25,252
Loss on CPP unamortized discount											(1,401)
Loss on extinguishment of trust preferred securities											(10,857)
Preferred stock dividends and discount accretion									(2,380)	(4,539)	(3,981)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS									42,150	40,583	9,013
Net income									44,530	45,122	25,252
Other Comprehensive Income (Loss)									(911)	(1,897)	6,555
Comprehensive income									$ 43,619	$ 43,225	$ 31,807