FAIR VALUE MEASUREMENTS- Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and cash equivalents	$ 111,918	$ 132,365	$ 100,780	$ 50,513
Investment securities available for sale	689,132	672,421
Investment securities held to maturity	39,182	39,620
Loans held for sale	47,287	20,205
Loans, net	3,066,775	2,890,449
Federal Home Loan Bank stock	24,844	19,499
Derivative assets	996	2,368
Purchased accounts receivable	52,688	44,821
Accrued interest receivable	12,695	12,071
Financial liabilities:
Deposits	3,310,297	3,247,364
Short-term borrowings	375,500	250,500
Long-term debt	194,967	180,164
Derivative liabilities	4,376	2,497
Accrued interest payable	2,550	2,688
Level 1
Financial assets:
Cash and cash equivalents, Fair Value	111,918	132,365
Investment securities available for sale	16,532	66,028
SBA loans held for investment	0	0
Loans held for sale, Fair Value	0	0
Loans, net, Fair Value	0	0
Federal Home Loan Bank stock, at cost	0	0
Derivative assets	0	0
Purchased accounts receivable, fair value	0	0
Accrued interest receivable, Fair Value	0	0
Financial liabilities:
Deposits, Fair Value	0	0
Short term borrowings, Fair Value	0	0
Long-term debt, Fair Value	0	0
Derivative liabilities	0	0
Accrued interest payable, Fair Value	0	0
Level 2
Financial assets:
Cash and cash equivalents, Fair Value	0	0
Investment securities available for sale	665,872	595,103
SBA loans held for investment	40,500	40,404
Loans held for sale, Fair Value	47,287	20,205
Loans, net, Fair Value	23,664	1,241
Federal Home Loan Bank stock, at cost	24,844	19,499
Derivative assets	588	2,027
Purchased accounts receivable, fair value	52,688	44,821
Accrued interest receivable, Fair Value	12,695	12,071
Financial liabilities:
Deposits, Fair Value	3,310,306	3,245,431
Short term borrowings, Fair Value	0	0
Long-term debt, Fair Value	0	0
Derivative liabilities	4,376	2,497
Accrued interest payable, Fair Value	2,550	2,688
Level 3
Financial assets:
Cash and cash equivalents, Fair Value	0	0
Investment securities available for sale	6,728	11,290
SBA loans held for investment	0	0
Loans held for sale, Fair Value	0	0
Loans, net, Fair Value	3,068,797	2,918,332
Federal Home Loan Bank stock, at cost	0	0
Derivative assets	408	342
Purchased accounts receivable, fair value	0	0
Accrued interest receivable, Fair Value	0	0
Financial liabilities:
Deposits, Fair Value	0	0
Short term borrowings, Fair Value	375,500	250,500
Long-term debt, Fair Value	198,928	183,326
Derivative liabilities		0
Accrued interest payable, Fair Value	0	0
Estimate of Fair Value Measurement
Financial assets:
Cash and cash equivalents, Fair Value	111,918	132,365
Investment securities available for sale	689,132	672,421
SBA loans held for investment	40,500	40,404
Loans held for sale, Fair Value	47,287	20,205
Loans, net, Fair Value	3,092,461	2,919,573
Federal Home Loan Bank stock, at cost	24,844	19,499
Derivative assets	996	2,368
Purchased accounts receivable, fair value	52,688	44,821
Accrued interest receivable, Fair Value	12,695	12,071
Financial liabilities:
Deposits, Fair Value	3,310,306	3,245,431
Short term borrowings, Fair Value	375,500	250,500
Long-term debt, Fair Value	198,928	183,326
Derivative liabilities	4,376	2,497
Accrued interest payable, Fair Value	$ 2,550	$ 2,688