FAIR VALUE MEASUREMENTS AND DISCLOSURES - Measured on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	$ 437,754	$ 307,130
U.S. Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	3,072
State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	44,088	22,809
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	365,877	259,519
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	24,717	24,802
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,067	1,078
Assets at fair value	438,821	308,208
Recurring | U.S. Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	3,072
Recurring | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	44,088	22,809
Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	365,877	259,519
Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	24,717	24,802
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,086	10,227
Loans held-for-sale	23,876	15,737
Other real estate	1,067	2,001
Assets held-for-sale	1,024	3,572
Assets at fair value	29,053	31,537
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Assets at fair value	0	0
Level 1 | Recurring | U.S. Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0
Level 1 | Recurring | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 1 | Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 1 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 1 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Loans held-for-sale	0	0
Other real estate	0	0
Assets held-for-sale	0	0
Assets at fair value	0	0
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,067	1,078
Assets at fair value	438,821	308,208
Level 2 | Recurring | U.S. Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	3,072
Level 2 | Recurring | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	44,088	22,809
Level 2 | Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	365,877	259,519
Level 2 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	24,717	24,802
Level 2 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Loans held-for-sale	23,876	15,737
Other real estate	0	0
Assets held-for-sale	1,024	3,572
Assets at fair value	24,900	19,309
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Assets at fair value	0	0
Level 3 | Recurring | U.S. Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0
Level 3 | Recurring | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 3 | Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 3 | Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value (cost $443,928 and $310,484)	0	0
Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,086	10,227
Loans held-for-sale	0	0
Other real estate	1,067	2,001
Assets held-for-sale	0	0
Assets at fair value	$ 4,153	$ 12,228