FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets:
Cash and cash equivalents	$ 59,762	$ 82,953	$ 80,640	$ 150,183
Securities held to maturity	80,991	85,694
Securities held to maturity	81,088	85,749
FHLB stock	7,044	4,976
Liabilities:
Short-term borrowings	75,000	40,000
Securities sold under agreement to repurchase	249,582	312,118
Other long-term debt	3,630	3,651
Level 1
Assets:
Cash and cash equivalents	59,762	82,953
Total assets	59,762	82,953
Liabilities:
Deposits	1,321,166	1,328,262
Accrued interest payable	11	11
Total liabilities	1,321,177	1,328,273
Level 2
Assets:
Securities available for sale	287,989	333,998
Securities held to maturity	81,088	85,749
Interest rate swap agreement	973	422
Accrued interest receivable	1,096	1,232
Total assets	371,146	421,401
Liabilities:
Deposits	189,528	198,364
Short-term borrowings	75,000	40,000
Securities sold under agreement to repurchase	249,651	312,019
Other long-term debt	3,585	3,600
Junior subordinated debentures issued to unconsolidated subsidiary trust	14,721	14,775
Interest rate swap agreement	774	194
Accrued interest payable	112	99
Total liabilities	533,371	569,051
Level 3
Assets:
Loans, net of allowance for loan losses	1,511,073	1,484,718
Accrued interest receivable	3,989	3,490
Total assets	1,515,062	1,488,208
Carrying Amount
Assets:
Cash and cash equivalents	59,762	82,953
Securities available for sale	287,989	333,998
Securities held to maturity	80,991	85,694
FHLB stock	7,044	4,976
Loans, net of allowance for loan losses	1,529,531	1,501,550
Interest rate swap agreement	973	422
Accrued interest receivable	5,085	4,722
Total assets	1,971,375	2,014,315
Liabilities:
Deposits	1,511,676	1,527,470
Short-term borrowings	75,000	40,000
Securities sold under agreement to repurchase	249,582	312,118
Other long-term debt	3,630	3,651
Junior subordinated debentures issued to unconsolidated subsidiary trust	20,619	20,619
Interest rate swap agreement	774	194
Accrued interest payable	123	110
Total liabilities	1,861,404	1,904,162
Fair Value
Assets:
Cash and cash equivalents	59,762	82,953
Securities available for sale	287,989	333,998
Securities held to maturity	81,088	85,749
Loans, net of allowance for loan losses	1,511,073	1,484,718
Interest rate swap agreement	973	422
Accrued interest receivable	5,085	4,722
Total assets	1,945,970	1,992,562
Liabilities:
Deposits	1,510,694	1,526,626
Short-term borrowings	75,000	40,000
Securities sold under agreement to repurchase	249,651	312,019
Other long-term debt	3,585	3,600
Junior subordinated debentures issued to unconsolidated subsidiary trust	14,721	14,775
Interest rate swap agreement	774	194
Accrued interest payable	123	110
Total liabilities	$ 1,854,548	$ 1,897,324