CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents
Cash and non-interest-bearing deposits due from banks	$ 46,886subk_NonInterestBearingDeposits	$ 41,140subk_NonInterestBearingDeposits
Interest-bearing deposits due from banks	12,138us-gaap_InterestBearingDepositsInBanks	13,376us-gaap_InterestBearingDepositsInBanks
Federal funds sold	0us-gaap_FederalFundsSold	1,000us-gaap_FederalFundsSold
Total cash and cash equivalents	59,024	55,516
Interest-bearing time deposits in other banks	10,000	10,000
Federal Reserve Bank, Federal Home Loan Bank and other stock	6,800	8,600
Investment securities:
Available for sale, at fair value	291,557us-gaap_AvailableForSaleSecurities	298,670us-gaap_AvailableForSaleSecurities
Held to maturity (fair value of $65,414 and $64,796, respectively)	62,191us-gaap_HeldToMaturitySecurities	62,270us-gaap_HeldToMaturitySecurities
Total investment securities	353,748us-gaap_MarketableSecuritiesCurrent	360,940us-gaap_MarketableSecuritiesCurrent
Loans	1,382,160	1,355,427
Allowance for loan losses	19,325	19,200
Net loans	1,362,835	1,336,227
Loans held for sale	2,836us-gaap_LoansReceivableHeldForSaleNet	26,495us-gaap_LoansReceivableHeldForSaleNet
Premises and equipment, net	23,219us-gaap_PropertyPlantAndEquipmentNet	23,641us-gaap_PropertyPlantAndEquipmentNet
Bank owned life insurance	45,418us-gaap_BankOwnedLifeInsurance	45,109us-gaap_BankOwnedLifeInsurance
Deferred taxes	14,886	15,714
Accrued interest and loan fees receivable	6,482us-gaap_InterestReceivable	5,676us-gaap_InterestReceivable
Goodwill and other intangibles	3,043subk_GoodwillAndOtherIntangibles	2,991subk_GoodwillAndOtherIntangibles
Other assets	3,666us-gaap_OtherAssets	4,374us-gaap_OtherAssets
TOTAL ASSETS	1,891,957us-gaap_Assets	1,895,283us-gaap_Assets
LIABILITIES & STOCKHOLDERS' EQUITY
Demand deposits	682,593us-gaap_DemandDepositAccounts	683,634us-gaap_DemandDepositAccounts
Savings, N.O.W. and money market deposits	685,891	653,667
Subtotal core deposits	1,368,484subk_SubtotalCoreDeposit	1,337,301subk_SubtotalCoreDeposit
Time deposits	223,188us-gaap_TimeDeposits	218,759us-gaap_TimeDeposits
Total deposits	1,591,672us-gaap_Deposits	1,556,060us-gaap_Deposits
Borrowings	90,000us-gaap_LongTermDebt	130,000us-gaap_LongTermDebt
Unfunded pension liability	6,192	6,303
Capital leases	4,483us-gaap_CapitalLeaseObligations	4,511us-gaap_CapitalLeaseObligations
Other liabilities	12,050us-gaap_OtherLiabilities	15,676us-gaap_OtherLiabilities
TOTAL LIABILITIES	1,704,397us-gaap_Liabilities	1,712,550us-gaap_Liabilities
COMMITMENTS AND CONTINGENT LIABILITIES
STOCKHOLDERS' EQUITY
Common stock (par value $2.50; 15,000,000 shares authorized; 13,891,390 shares and 13,836,508 shares issued at March 31, 2015 and December 31, 2014, respectively; 11,725,652 shares and 11,670,770 shares outstanding at March 31, 2015 and December 31, 2014, respectively)	34,728us-gaap_CommonStockValue	34,591us-gaap_CommonStockValue
Surplus	44,495	44,230
Retained earnings	119,478	116,169
Treasury stock at par (2,165,738 shares)	(5,414)us-gaap_TreasuryStockValue	(5,414)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss, net of tax	(5,727)	(6,843)
TOTAL STOCKHOLDERS' EQUITY	187,560us-gaap_StockholdersEquity	182,733us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,891,957	$ 1,895,283

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