2016 ACQUISITION OF CORNERSTONE BANCORP, INC. - ACQUISITION SUMMARY (Details) - USD ($)		3 Months Ended	9 Months Ended
	May 17, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Deposits
Goodwill				$ 16,300,000	$ 16,300,000
Fair Value Adjustments
Assets acquired:
Loans	$ (5,525,000)
Allowance for loan and lease losses	1,955,000
Loans, net	(3,570,000)
Premises and equipment, net	4,457,000
Core deposit intangible	1,205,000
Deferred income taxes	(74,000)
Total assets acquired	2,018,000
Deposits
Deposits	92,000
Other liabilities and accrued interest payable	787,000
Total liabilities assumed	879,000
Net assets acquired	1,139,000
Recast Adjustments
Assets acquired:
Loans	13,000
Loans, net	13,000
Total assets acquired	13,000
Deposits
Net assets acquired	13,000
Deposits: Interest-bearing | Fair Value Adjustments
Deposits
Deposits	92,000
Cornerstone
Assets acquired:
Cash and cash equivalents	22,707,000
Investment securities	329,000
Loans	195,136,000
Allowance for loan and lease losses	(1,955,000)
Loans, net	193,181,000
Federal Home Loan Bank Stock	224,000
Premises and equipment, net	7,770,000
Deferred income taxes	3,714,000
Bank owned life insurance	7,461,000
Other assets and accrued interest receivable	658,000
Total assets acquired	236,044,000
Deposits
Deposits	205,165,000
Subordinated note	4,124,000
Other liabilities and accrued interest payable	2,244,000
Total liabilities assumed	211,533,000
Net assets acquired	24,511,000
Cornerstone | Deposits: Non interest-bearing
Deposits
Deposits	52,908,000
Cornerstone | Deposits: Interest-bearing
Deposits
Deposits	152,257,000
Cornerstone
Assets acquired:
Cash and cash equivalents	22,707,000
Investment securities	329,000
Loans	189,624,000
Loans, net	189,624,000
Federal Home Loan Bank Stock	224,000
Premises and equipment, net	12,227,000
Core deposit intangible	1,205,000
Deferred income taxes	3,640,000
Bank owned life insurance	7,461,000
Other assets and accrued interest receivable	658,000
Total assets acquired	238,075,000
Deposits
Deposits	205,257,000
Subordinated note	4,124,000
Other liabilities and accrued interest payable	3,031,000
Total liabilities assumed	212,412,000
Net assets acquired	25,663,000
Cash consideration paid	(31,795,000)
Goodwill	6,132,000
Acquisition-related noninterest expense		$ 257,000	$ 1,200,000
Cornerstone | Deposits: Non interest-bearing
Deposits
Deposits	52,908,000
Cornerstone | Deposits: Interest-bearing
Deposits
Deposits	$ 152,349,000