FAIR VALUE (Schedule of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial Assets:
Securities available for sale	$ 378,839	$ 377,936
FHLB and FRB stock	18,338	18,533
Loans held for sale, at fair value	2,343	1,576
Loans held for sale, at lower of cost or fair value	926	3,542
Accrued interest receivable	11,594	10,814
Financial Liabilities:
Federal home loan bank advances	105,000	108,000
Carrying Value [Member]
Financial Assets:
Cash and cash equivalents	304,027	160,773
Securities available for sale	378,839	377,936
CRA investment fund	4,847	4,719
FHLB and FRB stock	18,338	18,533
Loans held for sale, at fair value	2,343	1,576
Loans held for sale, at lower of cost or fair value	926	3,542
Loans, net of allowance for loan and lease losses	3,989,548	3,889,427
Accrued interest receivable	11,594	10,814
Financial Liabilities:
Deposits	4,095,655	3,895,340
Federal home loan bank advances	105,000	108,000
Subordinated debt	83,305	83,193
Accrued interest payable	2,494	2,868
Carrying Value [Member] | Designated as Hedging Instrument [Member]
Financial Assets:
Derivatives	175	1,657
Financial Liabilities:
Derivatives	4,074	849
Carrying Value [Member] | Not Designated as Hedging Instrument [Member]
Financial Assets:
Derivatives	30,569	9,689
Financial Liabilities:
Derivatives	30,569	9,689
Fair value [Member]
Financial Assets:
Cash and cash equivalents	304,027	160,773
Securities available for sale	378,839	377,936
CRA investment fund	4,847	4,719
Loans held for sale, at fair value	2,343	1,576
Loans held for sale, at lower of cost or fair value	1,000	3,654
Loans, net of allowance for loan and lease losses	3,946,808	3,852,004
Accrued interest receivable	11,594	10,814
Financial Liabilities:
Deposits	4,098,621	3,890,271
Federal home loan bank advances	108,401	108,950
Subordinated debt	84,400	82,207
Accrued interest payable	2,494	2,868
Fair value [Member] | Quoted Prices in Active Market For Identical Assets (Level 1) [Member]
Financial Assets:
Cash and cash equivalents	304,027	160,773
CRA investment fund	4,847	4,719
Financial Liabilities:
Deposits	3,433,048	3,249,274
Accrued interest payable	430	331
Fair value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Securities available for sale	378,839	377,936
Loans held for sale, at fair value	2,343	1,576
Loans held for sale, at lower of cost or fair value	1,000	3,654
Accrued interest receivable	1,708	1,875
Financial Liabilities:
Deposits	665,573	640,997
Federal home loan bank advances	108,401	108,950
Accrued interest payable	2,009	2,482
Fair value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial Assets:
Loans, net of allowance for loan and lease losses	3,946,808	3,852,004
Accrued interest receivable	9,886	8,939
Financial Liabilities:
Subordinated debt	84,400	82,207
Accrued interest payable	55	55
Fair value [Member] | Designated as Hedging Instrument [Member]
Financial Assets:
Derivatives	175	1,657
Financial Liabilities:
Derivatives	4,074	849
Fair value [Member] | Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Derivatives	175	1,657
Financial Liabilities:
Derivatives	4,074	849
Fair value [Member] | Not Designated as Hedging Instrument [Member]
Financial Assets:
Derivatives	30,569	9,689
Financial Liabilities:
Derivatives	30,569	9,689
Fair value [Member] | Not Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Derivatives	30,569	9,689
Financial Liabilities:
Derivatives	$ 30,569	$ 9,689