Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period		$ 1,000	$ 1,000
Provision for putback expenses		0	0
Other	[1]	(423)	0
Balance at end of period		$ 577	$ 1,000

[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.