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FAIR VALUE MEASUREMENT AND DISCLOSURE (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Loans held for sale	$ 16,630	$ 4,314
Available-for-sale Securities	913,523	910,692
Obligations of states and political subdivisions
Financial assets:
Available-for-sale Securities	111,999	93,752
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	454,073	453,672
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	337,716	342,894
Fair Value, Measurements, Recurring
Financial assets:
Loans held for sale	16,449	4,403
Customer loan swaps	24,260
Financial liabilities:
Junior subordinated debt interest rate swaps		5,682
Customer loan swaps	6
Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Financial assets:
Available-for-sale Securities	111,999	93,752
Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	454,073	453,672
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	337,716	342,894
Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]
Financial assets:
Available-for-sale Securities	9,735	20,374
Fair Value, Measurements, Recurring | Equity investments
Financial assets:
Available-for-sale Securities	808	746
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring
Financial assets:
Loans held for sale	0	0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]
Financial assets:
Available-for-sale Securities	0	0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Equity investments
Financial assets:
Available-for-sale Securities	0	0
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial assets:
Loans held for sale	16,449	4,403
Customer loan swaps	24,260
Financial liabilities:
Junior subordinated debt interest rate swaps		5,682
Customer loan swaps	6
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Financial assets:
Available-for-sale Securities	111,999	93,752
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	454,073	453,672
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Financial assets:
Available-for-sale Securities	337,716	342,894
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]
Financial assets:
Available-for-sale Securities	9,735	20,374
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Equity investments
Financial assets:
Available-for-sale Securities	808	746
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring
Financial assets:
Loans held for sale	0	0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]
Financial assets:
Available-for-sale Securities	0	0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Equity investments
Financial assets:
Available-for-sale Securities	0	0
Interest Rate Swap On Loans [Member] | Fair Value, Measurements, Recurring
Financial liabilities:
Junior subordinated debt interest rate swaps	1,507
Interest Rate Swap On Loans [Member] | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial liabilities:
Junior subordinated debt interest rate swaps	1,507
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps	968	95
Financial liabilities:
Customer loan swaps	30	28
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps	968	95
Financial liabilities:
Customer loan swaps	30	28
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring
Financial liabilities:
Customer loan swaps	0	0
Forward Contracts [Member] | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps	501	32
Financial liabilities:
Customer loan swaps		17
Forward Contracts [Member] | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps	501	32
Financial liabilities:
Customer loan swaps		17
Interest rate swaps | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps		7,841
Financial liabilities:
Junior subordinated debt interest rate swaps	9,602
Customer loan swaps		7,841
Interest rate swaps | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial assets:
Customer loan swaps		7,841
Financial liabilities:
Junior subordinated debt interest rate swaps	9,602
Customer loan swaps		7,841
Forward-Starting Interest Rate Swap | Fair Value, Measurements, Recurring
Financial liabilities:
Junior subordinated debt interest rate swaps		30
Forward-Starting Interest Rate Swap | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring
Financial liabilities:
Junior subordinated debt interest rate swaps		0
Forward-Starting Interest Rate Swap | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial liabilities:
Junior subordinated debt interest rate swaps		$ 30
Customer Loan Swaps | Fair Value, Measurements, Recurring
Financial liabilities:
Customer loan swaps	24,260
Customer Loan Swaps | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring
Financial liabilities:
Customer loan swaps	0
Customer Loan Swaps | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
Financial liabilities:
Customer loan swaps	24,260
Customer Loan Swaps | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring
Financial liabilities:
Customer loan swaps	$ 0

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