FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 82,953	$ 150,183	$ 154,459	$ 115,471
Securities held to maturity	85,694	119,674
Securities held to maturity	85,749	120,093
FHLB stock	4,976	3,797
Liabilities:
Short-term borrowings	40,000
Securities sold under agreement to repurchase	312,118	286,639
Other long-term debt	3,651	5,238
Level 1
Assets:
Cash and cash equivalents	82,953	150,183
Total assets	82,953	150,183
Liabilities:
Deposits	1,328,262	1,296,867
Accrued interest payable	11	13
Total liabilities	1,328,273	1,296,880
Level 2
Assets:
Securities available for sale	333,998	283,454
Securities held to maturity	85,749	120,093
Interest rate swap agreement	422	1,084
Accrued interest receivable	1,232	1,085
Total assets	421,401	405,716
Liabilities:
Deposits	198,364	254,179
Short-term borrowings	40,000
Securities sold under agreement to repurchase	312,019	286,586
Other long-term debt	3,600	5,191
Junior subordinated debentures issued to unconsolidated subsidiary trust	14,775	14,975
Interest rate swap agreement	194	1,004
Accrued interest payable	99	139
Total liabilities	569,051	562,074
Level 3
Assets:
Loans, net of allowance for loan losses	1,484,718	1,397,877
Accrued interest receivable	3,490	3,289
Total assets	1,488,208	1,401,166
Carrying Amount
Assets:
Cash and cash equivalents	82,953	150,183
Securities available for sale	333,998	283,454
Securities held to maturity	85,694	119,674
FHLB stock	4,976	3,797
Loans, net of allowance for loan losses	1,501,550	1,402,240
Interest rate swap agreement	422	1,084
Accrued interest receivable	4,722	4,374
Liabilities:
Deposits	1,527,470	1,551,439
Short-term borrowings	40,000
Securities sold under agreement to repurchase	312,118	286,639
Other long-term debt	3,651	5,238
Junior subordinated debentures issued to unconsolidated subsidiary trust	20,619	20,619
Interest rate swap agreement	194	1,004
Accrued interest payable	110	152
Total liabilities	1,904,162	1,865,091
Fair Value
Assets:
Cash and cash equivalents	82,953	150,183
Securities available for sale	333,998	283,454
Securities held to maturity	85,749	120,093
Loans, net of allowance for loan losses	1,484,718	1,397,877
Interest rate swap agreement	422	1,084
Accrued interest receivable	4,722	4,374
Total assets	1,992,562	1,957,065
Liabilities:
Deposits	1,526,626	1,551,046
Short-term borrowings	40,000
Securities sold under agreement to repurchase	312,019	286,586
Other long-term debt	3,600	5,191
Junior subordinated debentures issued to unconsolidated subsidiary trust	14,775	14,975
Interest rate swap agreement	194	1,004
Accrued interest payable	110	152
Total liabilities	$ 1,897,324	$ 1,858,954