PARENT COMPANY ONLY FINANCIAL STATEMENTS - Condensed Cash Flow Statement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 22,851 $ 15,786 $ 9,005
Adjustments to reconcile net income to net cash provided by operating activities:      
Net amortization of discount on subordinated debentures 107 218 0
Increase (decrease) in accrued interest payable and other liabilities (851) 503 (215)
Net cash provided by operating activities 27,435 20,421 13,670
CASH FLOWS FROM INVESTING ACTIVITIES:      
Net cash used in investing activities (408,494) (243,516) (164,231)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from initial public offering 0 57,138 0
Stock based compensation expense 2,006 133 11,088
Proceeds from other borrowed funds 200,000 18,000 15,069
Paydowns of other borrowed funds 0 (45,500) (10,000)
Redemption of preferred stock 0 (11,550) 0
Preferred stock dividends 0 (559) 0
Issuance (repurchase) of treasury stock 38 (52) 0
Net cash provided by financing activities 374,726 203,986 105,025
NET CHANGE IN CASH AND CASH EQUIVALENTS (6,333) (19,109) (45,536)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 148,431 167,540 213,076
CASH AND CASH EQUIVALENTS, END OF PERIOD 142,098 148,431 167,540
Parent Company      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income 22,851 15,786 9,005
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed earnings of subsidiaries (23,646) (16,748) (9,691)
Net amortization of discount on subordinated debentures 107 218 0
(Increase) decrease in other assets (399) 220 28
Increase (decrease) in accrued interest payable and other liabilities 186 (462) (441)
Net cash provided by operating activities (901) (986) (1,099)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Net cash and cash equivalents acquired in the purchase of F&M Bancshares, Inc. 0 (818) 0
Capital investment in bank subsidiary 0 (12,000) (9,000)
Net cash used in investing activities 0 (11,182) (9,000)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of common stock 2,006 133 11,088
Proceeds from initial public offering 0 57,138 0
Stock based compensation expense 1,501 1,351 0
Proceeds from other borrowed funds 0 18,000 15,069
Paydowns of other borrowed funds 0 (45,500) (10,000)
Redemption of preferred stock 0 (11,550) 0
Preferred stock dividends 0 (559) 0
Issuance (repurchase) of treasury stock 38 (52) 0
Net cash provided by financing activities 3,545 18,961 16,157
NET CHANGE IN CASH AND CASH EQUIVALENTS 2,644 6,793 6,058
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 18,562 11,769 5,711
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 21,206 $ 18,562 $ 11,769