Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period		$ 1,130	$ 1,685
Provision for putback expenses		210	210
Other	[1]	706	(944)
Balance at end of period		$ 2,046	$ 951

[1] Includes fair value adjustments for loans transferred due to underwriting issues as well as adjustments based on Trustmark’s mortgage loan servicing putback reserve analysis.