Condensed Parent Company Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Securities available for sale	$ 2,516,908	$ 2,093,404
Total assets	23,975,302	22,833,605
Long-term debt	436,280	490,145
Other liabilities	160,008	151,152
Stockholders' equity	2,719,768	2,413,143	$ 2,472,402	$ 2,425,069
Total liabilities and stockholders' equity	23,975,302	22,833,605
Hancock [Member]
Cash	316,457	36,364
Securities available for sale	69,210	83,835
Investment in bank subsidiaries	2,547,224	2,534,299
Investment in non-bank subsidiaries	11,204	3,051
Due from subsidiaries and other assets	27,941	31,168
Total assets	2,972,036	2,688,717
Long-term debt	251,573	275,000
Other liabilities	695	574
Stockholders' equity	2,719,768	2,413,143
Total liabilities and stockholders' equity	$ 2,972,036	$ 2,688,717