FAIR VALUE - Carrying Amounts and Estimated Fair Values of Financial Instruments - (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial assets
Interest bearing time deposits	$ 1,960	$ 1,960
FHLB and other stock, at cost	21,537	11,300
Interest receivable	6,911	5,878
Carrying Value
Financial assets
Cash and cash equivalents	80,329	67,578
Interest bearing time deposits	1,960	1,960
Loans including loans held for sale, net	2,567,304	2,139,765
FHLB and other stock, at cost	21,537	11,300
Interest receivable	11,995	10,779
Financial liabilities
Deposits	(3,124,028)	(2,650,775)
Other borrowings	(108,076)	(28,363)
FHLB advances	(259,638)	(269,488)
Interest payable	(669)	(560)
Subordinated debentures	(41,239)	(41,239)
Fair Value
Financial assets
Cash and cash equivalents	80,329	67,578
Interest bearing time deposits	1,960	1,960
Loans including loans held for sale, net	2,645,900	2,195,092
Interest receivable	11,995	10,779
Financial liabilities
Deposits	(3,123,928)	(2,648,844)
Other borrowings	(118,876)	(28,363)
FHLB advances	(263,694)	(270,977)
Interest payable	(669)	(560)
Subordinated debentures	(24,212)	(24,212)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Cash and cash equivalents	62,809	56,104
Financial liabilities
Deposits	(705,428)	(641,439)
Significant Other Observable Inputs (Level 2)
Financial assets
Cash and cash equivalents	17,520	11,474
Interest bearing time deposits	1,960	1,960
Loans including loans held for sale, net	7,222	7,726
Interest receivable	5,084	4,901
Financial liabilities
Deposits	(2,418,500)	(2,007,405)
Other borrowings	(118,876)	(28,363)
FHLB advances	(263,694)	(270,977)
Interest payable	(669)	(560)
Subordinated debentures	(24,212)	(24,212)
Significant Unobservable Inputs (Level 3)
Financial assets
Loans including loans held for sale, net	2,638,678	2,187,366
Interest receivable	$ 6,911	$ 5,878