PARENT COMPANY - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 59,255	$ 53,000
Deferred tax asset, net	5,780	9,031
Other assets	14,802	11,709
Total assets	3,081,083	2,951,522
Liabilities
Junior subordinated debt	6,726	6,726
Note payable		27,679
Other liabilities	23,646	16,377
Total liabilities	2,634,869	2,593,885
Shareholders’ equity
Preferred stock
Common stock	257	230
Additional paid-in capital	343,249	278,501
Retained earnings	118,353	95,274
Treasury stock	(15,256)	(15,446)
Accumulated other comprehensive loss	(389)	(922)
Total shareholders’ equity	446,214	357,637	$ 344,313	$ 329,253
Total liabilities and shareholders’ equity	3,081,083	2,951,522
Parent Company
Assets
Cash and due from banks	45,636	5,057
Investment in subsidiary	407,305	387,179
Deferred tax asset, net	141	464
Other assets	2,460	1,244
Total assets	455,542	393,944
Liabilities
Junior subordinated debt	6,726	6,726
Note payable		27,679
Other liabilities	2,602	1,902
Total liabilities	9,328	36,307
Shareholders’ equity
Common stock	257	230
Additional paid-in capital	343,249	278,501
Retained earnings	118,353	95,274
Treasury stock	(15,256)	(15,446)
Accumulated other comprehensive loss	(389)	(922)
Total shareholders’ equity	446,214	357,637
Total liabilities and shareholders’ equity	$ 455,542	$ 393,944