FAIR VALUE MEASUREMENT (Schedule of Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill, Impairment Loss	$ 2,800,000
Financial assets:
Available-for-sale Securities	797,242,000		808,477,000
Held-to-maturity Securities	6,973,000		0
Held-to-maturity Securities, Fair Value	6,967,000
Trading account assets	2,308,000		2,488,000
Impaired Financing Receivable, Unpaid Principal Balance	28,512,000		30,251,000		28,510,000
Readily Available Market Prices (Level 1)
Financial assets:
Cash and due from banks	51,877,000		51,355,000
FHLB and Federal Reserve Bank stock	20,417,000		19,724,000
Trading account assets	2,308,000		2,488,000
Financial liabilities:
Deposits	1,315,062,000		1,324,221,000
Other borrowed funds	411,282,000		400,144,000
Interest payable	531,000		567,000
Observable Market Data (Level 2)
Financial assets:
Available-for-sale Securities	797,242,000		808,477,000
Held-to-maturity Securities, Fair Value	6,967,000
Mortgage servicing rights	1,617,000	[1]	1,494,000	[1]
Interest receivable	6,061,000		5,808,000
Customer interest rate swap agreements	142,000		114,000
Financial liabilities:
Deposits	524,568,000		492,978,000
FHLB advances	59,000,000		59,118,000
Commercial repurchase agreements	31,990,000		32,038,000
Junior subordinated debentures	43,947,000		43,922,000
Interest rate swap agreements	5,577,000		3,911,000
Customer interest rate swap agreements	142,000		114,000
Company Determined Fair Value (Level 3)
Financial assets:
Investment in trust preferred securities affiliates	1,331,000		1,331,000
Company Determined Fair Value (Level 3) | Residential real estate loans
Financial assets:
Loans receivable, net of allowance	574,105,000		577,153,000
Company Determined Fair Value (Level 3) | Commercial real estate loans
Financial assets:
Loans receivable, net of allowance	569,543,000		535,961,000
Company Determined Fair Value (Level 3) | Commercial loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage Collateral To Loans	75.00%
Financial assets:
Loans receivable, net of allowance	182,310,000		171,432,000
Company Determined Fair Value (Level 3) | Home equity loans
Financial assets:
Loans receivable, net of allowance	268,161,000		271,041,000
Company Determined Fair Value (Level 3) | Consumer loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage Collateral To Loans	80.00%
Financial assets:
Loans receivable, net of allowance	16,773,000		17,662,000
Carrying Amount
Financial assets:
Cash and due from banks	51,877,000		51,355,000
Available-for-sale Securities	797,242,000		808,477,000
Held-to-maturity Securities	6,973,000
FHLB and Federal Reserve Bank stock	20,417,000		19,724,000
Trading account assets	2,308,000		2,488,000
Mortgage servicing rights	664,000	[1]	726,000	[1]
Interest receivable	6,061,000		5,808,000
Investment in trust preferred securities affiliates	1,331,000		1,331,000
Customer interest rate swap agreements	142,000		114,000
Financial liabilities:
Deposits	1,836,679,000		1,813,824,000
FHLB advances	56,094,000		56,112,000
Commercial repurchase agreements	30,131,000		30,142,000
Other borrowed funds	411,218,000		399,916,000
Junior subordinated debentures	43,947,000		43,922,000
Interest payable	531,000		567,000
Interest rate swap agreements	5,577,000		3,911,000
Customer interest rate swap agreements	142,000		114,000
Carrying Amount | Residential real estate loans
Financial assets:
Loans receivable, net of allowance	561,639,000		563,425,000
Carrying Amount | Commercial real estate loans
Financial assets:
Loans receivable, net of allowance	569,588,000		536,107,000
Carrying Amount | Commercial loans
Financial assets:
Loans receivable, net of allowance	183,976,000		172,105,000
Carrying Amount | Home equity loans
Financial assets:
Loans receivable, net of allowance	266,896,000		269,888,000
Carrying Amount | Consumer loans
Financial assets:
Loans receivable, net of allowance	16,417,000		17,287,000
Fair Value
Financial assets:
Cash and due from banks	51,877,000		51,355,000
Available-for-sale Securities	797,242,000		808,477,000
Held-to-maturity Securities, Fair Value	6,967,000
FHLB and Federal Reserve Bank stock	20,417,000		19,724,000
Trading account assets	2,308,000		2,488,000
Mortgage servicing rights	1,617,000	[1]	1,494,000	[1]
Interest receivable	6,061,000		5,808,000
Investment in trust preferred securities affiliates	1,331,000		1,331,000
Customer interest rate swap agreements	142,000		114,000
Financial liabilities:
Deposits	1,839,630,000		1,817,199,000
FHLB advances	59,000,000		59,118,000
Commercial repurchase agreements	31,990,000		32,038,000
Other borrowed funds	411,282,000		400,144,000
Junior subordinated debentures	43,947,000		43,922,000
Interest payable	531,000		567,000
Interest rate swap agreements	5,577,000		3,911,000
Customer interest rate swap agreements	142,000		114,000
Fair Value | Residential real estate loans
Financial assets:
Loans receivable, net of allowance	574,105,000		577,153,000
Fair Value | Commercial real estate loans
Financial assets:
Loans receivable, net of allowance	569,543,000		535,961,000
Fair Value | Commercial loans
Financial assets:
Loans receivable, net of allowance	182,310,000		171,432,000
Fair Value | Home equity loans
Financial assets:
Loans receivable, net of allowance	268,161,000		271,041,000
Fair Value | Consumer loans
Financial assets:
Loans receivable, net of allowance	16,773,000		17,662,000
Servicing Contracts [Member]
Financial assets:
Servicing Asset At Amortized Value Net Of Valuation Allowance	376,000		322,000
Impaired Loans Specifically Reserved [Member]
Financial assets:
Impaired Financing Receivable, Unpaid Principal Balance	21,100,000		19,400,000
Other Real Estate Owned [Member]
Financial assets:
Other Real Estate	613,000		612,000
Financial Services [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill, Fair Value Disclosure	$ 3,900,000

[1] (1) Reported fair value represents all MSRs currently being serviced by the Company, regardless of carrying amount.