PARENT COMPANY FINANCIAL INFORMATION (Condensed Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities:
Net income	$ 11,775	$ 10,783	$ 10,811	$ 6,097	$ 7,863	$ 7,683	$ 6,057	$ 8,531	$ 39,466	$ 30,134
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock based compensation expense									3,312	3,067
Net cash used in operating activities									87,270	38,956
Cash Flows From Financing Activities:
Net cash used in investing activities									(489,035)	(1,014,789)
Cash flows from financing activities:
Redemption of common stock for tax withholdings for restricted stock vesting									(881)	(89)
Net cash provided by financing activities									876,850	1,132,103
Net (decrease) increase in cash and cash equivalents									475,085	156,270
Cash and cash equivalents at the beginning of the period				389,220					389,220
Cash and cash equivalents at the end of the period	864,305				389,220				864,305	389,220
Parent Company
Cash Flows From Operating Activities:
Net income									39,466	30,134
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Undistributed earnings of subsidiary bank									(42,844)	(35,209)
Non-employee stock based compensation									410	400
Amortization of trust preferred issuance costs									56	56
Stock based compensation expense									2,902	2,667
Decrease (increase) in other assets									(1,084)	274
Increase (decrease) in other liabilities									154	56
Net cash used in operating activities									(940)	(1,622)
Cash flows from financing activities:
Redemption of common stock for tax withholdings for restricted stock vesting									(881)	(89)
Net cash provided by financing activities									(881)	(89)
Net (decrease) increase in cash and cash equivalents									(1,821)	(1,711)
Cash and cash equivalents at the beginning of the period				$ 1,836				$ 3,547	1,836	3,547
Cash and cash equivalents at the end of the period	$ 15				$ 1,836				$ 15	$ 1,836