Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 11,992		$ 12,059	$ 9,636
Transfers		0
Provision for loan losses, acquired loans		3,757		3,425	6,171
Loans charged-off		(6,616)		(7,200)	(6,147)
Recoveries		2,264		3,708	2,399
Net (charge-offs) recoveries		(4,352)		(3,492)	(3,748)
Balance at end of period		11,397		11,992	12,059
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		11,259		10,541	7,249
Transfers	[1]	215
Provision for loan losses, acquired loans		4,084		3,854	7,149
Loans charged-off		(6,534)		(6,722)	(6,274)
Recoveries		2,288		3,586	2,417
Net (charge-offs) recoveries		(4,246)		(3,136)	(3,857)
Balance at end of period		11,312		11,259	10,541
Covered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		733		1,518	2,387
Transfers		(215)
Provision for loan losses, acquired loans		(327)		(429)	(978)
Loans charged-off		(82)		(478)	127
Recoveries		(24)		122	(18)
Net (charge-offs) recoveries		(106)		(356)	109
Balance at end of period		$ 85	[2]	$ 733	$ 1,518

[1] The allowance for loan losses on acquired covered loans, excluding the acquired covered loans secured by 1-4 family residential property, transferred to the allowance for loan losses on acquired noncovered loans as a result of the expiration of the related loss share agreement with the FDIC on June 30, 2016.

[2] Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential property expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential property will expire in 2021. Effective July 1, 2016, all acquired covered loans, excluding the acquired covered loans secured by 1-4 family residential property, were reclassified to acquired noncovered loans.