Operating Expenses (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
Operating Expenses [Abstract]
Salaries and wages									$ 78,014	$ 68,668	$ 61,301
Employee benefits									18,405	15,715	13,192
Occupancy									13,934	12,413	12,974
Equipment and software									13,734	13,112	11,935
Outside processing/service fees									11,134	10,679	9,583
FDIC insurance premiums									4,362	4,320	5,375
Professional fees									3,771	4,347	4,128
Postage and express mail									3,051	3,149	3,147
Advertising and marketing									2,971	3,106	2,850
Donations									2,829	1,892	1,537
Training, travel and other employee expenses									2,512	2,530	2,246
Telephone									1,940	1,693	1,631
Intangible asset amortization									1,909	1,569	1,860
Supplies									1,670	1,567	1,690
Credit-related expenses									707	3,816	9,535
Other									4,005	3,345	1,509
Total Operating Expenses	$ 42,405	$ 39,545	$ 41,041	$ 41,957	$ 42,028	$ 36,723	$ 36,199	$ 36,971	$ 164,948	$ 151,921	$ 144,493