Cost Savings Initiatives and Acquisition and Integration Activities (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Restructuring charges	$ 5,341	$ 141
Restructuring Reserve	14,705	1,411	16,425	2,696
Cost Savings and Other Restructuring [Member]
Segment Reporting Information [Line Items]
Restructuring charges	2,713	47
Number of Branches closed or consolidated	94
Restructuring Reserve	5,932	628	6,722	1,685
Acquisition & Integration [Member]
Segment Reporting Information [Line Items]
Restructuring charges	2,628	94
Restructuring Reserve	$ 8,773	$ 783	$ 9,703	$ 1,011