Other Real Estate Owned (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($) property
OREO
Balance at the beginning of the period	$ 18,316	$ 24,803	$ 24,803
Acquired in Southeastern Bank acquisition	385
Additions, net	8,375	9,296
Transfers		4,222
Write-downs	(2,220)	(1,939)
Sold	(11,329)	(14,171)
Balance at the end of the period	13,527	22,211	18,316
Number of properties uncovered | property					17
Carrying Value of uncovered OREO assets	18,316	24,803	24,803	$ 13,527	$ 22,211
Covered OREO
Balance at the beginning of the period		5,751	5,751
Additions, net		2,151
Transfers		(4,222)
Write-downs		(2,131)
Sold		(1,549)
Total
Balance at the beginning of the period	18,316	30,554	30,554
Acquired in Southeastern Bank acquisition	385
Additions, net	8,375	11,447
Write-downs	(2,220)	(4,070)
Sold	(11,329)	(15,720)
Balance at the end of the period	13,527	22,211	18,316
Number of properties held | property				67	108
Residential real estate included in OREO	1,400	3,700	3,600
Residential real estate consumer mortgage loans in foreclosure process	$ 7,000	$ 4,700	$ 5,100