Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	Feb. 15, 2013 BancTrust Financial Group, Inc. [Member]	Mar. 31, 2013 Oxford, Mississippi Branches [Member]	Mar. 31, 2013 Acquisition [Member] Oxford, Mississippi Branches [Member] Branch
Business Acquisition [Line Items]
Number of branches acquired			2
Business Acquisition Purchase Price Allocation Deposits acquired	$ 1,740,254	$ 11,800