FAIR VALUE MEASUREMENTS (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
Financial assets:
Cash and cash equivalents	$ 108,502	$ 132,365		$ 73,443	$ 100,779
Investment securities available for sale	658,323	672,421	[1]
Investment securities held to maturity	39,511	39,620	[1]
Loans held for sale	32,322	20,205	[1]
Loans, net	2,905,575	2,890,449	[1]
Purchased accounts receivable	62,129	44,821	[1]
Federal Home Loan Bank stock	20,277	19,499	[1]
Derivative assets	1,470	2,368
Accrued interest receivable	11,950	12,071
Financial liabilities:
Deposits	3,209,175	3,247,364	[1]
Short-term borrowings	325,500	250,500	[1]
Long-term debt	137,199	180,164	[1]
Derivative liabilities	4,251	2,497
Accrued interest payable	1,996	2,688
Level 1
Financial assets:
Cash and cash equivalents, Fair Value	108,502	132,365
Investment securities available for sale	63,967	66,028
Investment securities held to maturity, Fair Value	0	0
Loans held for sale, Fair Value	0	0
Loans, net, Fair Value	0	0
Purchased accounts receivable	0	0
Federal Home Loan Bank stock, at cost	0	0
Derivative assets	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, Fair Value	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	582,976	595,103
Investment securities held to maturity, Fair Value	40,607	40,404
Loans held for sale, Fair Value	32,322	20,205
Loans, net, Fair Value	6,472	1,241
Purchased accounts receivable	62,129	44,821
Federal Home Loan Bank stock, at cost	20,277	19,499
Derivative assets	834	2,027
Accrued interest receivable, Fair Value	11,950	12,071
Financial liabilities:
Deposits, Fair Value	3,210,666	3,245,431
Short term borrowings, Fair Value	0	0
Long-term debt, Fair Value	0	0
Derivative liabilities, Fair Value	4,251	2,497
Accrued interest payable, Fair Value	1,996	2,688
Level 3
Financial assets:
Cash and cash equivalents, Fair Value	0	0
Investment securities available for sale	11,380	11,290
Investment securities held to maturity, Fair Value	0	0
Loans held for sale, Fair Value	0	0
Loans, net, Fair Value	2,930,588	2,918,332
Purchased accounts receivable	0	0
Federal Home Loan Bank stock, at cost	0	0
Derivative assets	636	341
Accrued interest receivable, Fair Value	0	0
Financial liabilities:
Deposits, Fair Value	0	0
Short term borrowings, Fair Value	325,500	250,500
Long-term debt, Fair Value	142,499	183,326
Derivative liabilities, Fair Value	0	0
Accrued interest payable, Fair Value	0	0
Estimate of Fair Value Measurement
Financial assets:
Cash and cash equivalents, Fair Value	108,502	132,365
Investment securities available for sale	658,323	672,421
Investment securities held to maturity, Fair Value	40,607	40,404
Loans held for sale, Fair Value	32,322	20,205
Loans, net, Fair Value	2,937,060	2,919,573
Purchased accounts receivable	62,129	44,821
Federal Home Loan Bank stock, at cost	20,277	19,499
Derivative assets	1,470	2,368
Accrued interest receivable, Fair Value	11,950	12,071
Financial liabilities:
Deposits, Fair Value	3,210,666	3,245,431
Short term borrowings, Fair Value	325,500	250,500
Long-term debt, Fair Value	142,499	183,326
Derivative liabilities, Fair Value	4,251	2,497
Accrued interest payable, Fair Value	$ 1,996	$ 2,688

[1] Derived from the audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.