Community Bank System (CBU) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	COMMUNITY BANK SYSTEM, INC.
Entity Central Index Key	723188
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		40,769,536
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15

CONSOLIDATED_STATEMENTS_OF_CON

CONSOLIDATED STATEMENTS OF CONDITION (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets:
Cash and cash equivalents	$150,533	$138,396
Available-for-sale investment securities (cost of $2,516,351 and $2,397,886, respectively)	2,622,779	2,472,925
Other securities, at cost	33,645	40,049
Loans held for sale, at fair value	1,437	1,042
Loans	4,163,911	4,236,206
Allowance for loan losses	-45,005	-45,341
Net loans	4,118,906	4,190,865
Goodwill, net	375,174	375,174
Core deposit intangibles, net	9,284	10,023
Other intangibles, net	1,596	1,776
Intangible assets, net	386,054	386,973
Premises and equipment, net	93,325	93,633
Accrued interest and fees receivable	27,518	24,645
Other assets	141,842	140,912
Total assets	7,576,039	7,489,440
Liabilities:
Noninterest-bearing deposits	1,316,621	1,324,661
Interest-bearing deposits	4,809,926	4,610,603
Total deposits	6,126,547	5,935,264
Borrowings	195,700	338,000
Subordinated debt held by unconsolidated subsidiary trusts	102,128	102,122
Accrued interest and other liabilities	138,262	126,150
Total liabilities	6,562,637	6,501,536
Commitments and contingencies (See Note J)
Shareholders' equity:
Preferred stock, $1.00 par value, 500,000 shares authorized, 0 shares issued	0	0
Common stock, $1.00 par value, 75,000,000 shares authorized; 41,756,657 and 41,606,422 shares issued, respectively	41,757	41,606
Additional paid-in capital	413,925	409,984
Retained earnings	536,056	525,985
Accumulated other comprehensive income	48,933	30,720
Treasury stock, at cost (1,032,382 and 858,701 shares, respectively)	-27,269	-20,391
Total shareholders' equity	1,013,402	987,904
Total liabilities and shareholders' equity	$7,576,039	$7,489,440

CONSOLIDATED_STATEMENTS_OF_CON1

CONSOLIDATED STATEMENTS OF CONDITION (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Assets:
Available-for-sale investment securities, cost	$2,516,351	$2,397,886
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$1	$1
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$1	$1
Common stock, authorized (in shares)	75,000,000	75,000,000
Common stock, issued (in shares)	41,756,657	41,606,422
Treasury stock, shares at cost (in shares)	1,032,382	858,701

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Interest and fees on loans	$45,591	$45,693
Interest and dividends on taxable investments	12,060	12,470
Interest and dividends on nontaxable investments	4,803	5,076
Total interest income	62,454	63,239
Interest expense:
Interest on deposits	1,800	2,235
Interest on borrowings	200	284
Interest on subordinated debt held by unconsolidated subsidiary trusts	614	612
Total interest expense	2,614	3,131
Net interest income	59,840	60,108
Provision for loan losses	623	1,000
Net interest income after provision for loan losses	59,217	59,108
Noninterest income:
Deposit service fees	12,470	12,255
Other banking services	1,055	1,190
Employee benefit services	11,075	10,435
Wealth management services	4,446	4,474
Total noninterest income	29,046	28,354
Noninterest expenses:
Salaries and employee benefits	31,029	30,740
Occupancy and equipment	7,395	7,691
Data processing and communications	6,990	6,803
Amortization of intangible assets	919	1,141
Legal and professional fees	1,746	1,947
Office supplies and postage	1,580	1,551
Business development and marketing	1,564	1,730
FDIC insurance premiums	989	1,019
Acquisition expenses	395	123
Other	3,341	3,176
Total noninterest expenses	55,948	55,921
Income before income taxes	32,315	31,541
Income taxes	10,018	9,368
Net income	$22,297	$22,173
Basic earnings per share (in dollars per share)	$0.55	$0.55
Diluted earnings per share (in dollars per share)	$0.54	$0.54
Cash dividends declared per share (in dollars per share)	$0.30	$0.28

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Pension and other post retirement obligations:
Amortization of actuarial (gains)/losses included in net periodic pension cost, gross	$363	($77)
Tax effect	-140	29
Amortization of actuarial (gains)/losses included in net periodic pension cost, net	223	-48
Amortization of prior service cost included in net periodic pension cost, gross	-43	-44
Tax effect	16	17
Amortization of prior service cost included in net periodic pension cost, net	-27	-27
Other comprehensive income/(loss) related to pension and other post retirement obligations, net of taxes	196	-75
Unrealized gains on available-for-sale securities:
Net unrealized holding gains arising during period, gross	31,389	40,558
Tax effect	-13,372	-15,003
Net unrealized holding gains arising during period, net	18,017	25,555
Other comprehensive income related to unrealized gains on available-for-sale securities, net of taxes	18,017	25,555
Other comprehensive income, net of tax	18,213	25,480
Net income	22,297	22,173
Comprehensive income	40,510	47,653
Accumulated Other Comprehensive Income By Component:
Unrealized loss for pension and other postretirement obligations	-26,621		-26,941
Tax effect	10,102		10,225
Net unrealized loss for pension and other postretirement obligations	-16,519		-16,716
Unrealized gain on available-for-sale securities	106,428		75,039
Tax effect	-40,976		-27,603
Net unrealized gain on available-for-sale securities	65,452		47,436
Accumulated other comprehensive income	$48,933		$30,720

CONSOLIDATED_STATEMENT_OF_CHAN

CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock [Member]	Total
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2014	$41,606	$409,984	$525,985	$30,720	($20,391)	$987,904
Balance (in shares) at Dec. 31, 2014	40,747,721
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			22,297			22,297
Other comprehensive income, net of tax				18,213		18,213
Cash dividends declared:
Common, $0.30 per share			-12,226			-12,226
Common stock issued under employee stock plan, including tax benefits of $696	151	2,790				2,941
Common stock issued under employee stock plan, including tax benefits of $696 (in shares)	150,235
Stock-based compensation		1,151				1,151
Treasury stock purchased					-9,125	-9,125
Treasury stock purchased (in shares)	-265,230					-265,230
Treasury stock issued to benefit plan					2,247	2,247
Treasury stock issued to benefit plan (in shares)	91,549
Balance at Mar. 31, 2015	$41,757	$413,925	$536,056	$48,933	($27,269)	$1,013,402
Balance (in shares) at Mar. 31, 2015	40,724,275

CONSOLIDATED_STATEMENT_OF_CHAN1

CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Cash dividends declared:
Dividends declared per common share (in dollars per share)	$0.30
Common stock issued under employee stock plan, tax benefits	$696

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$22,297	$22,173
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,247	3,286
Amortization of intangible assets	919	1,141
Net accretion/amortization of premiums and discounts on securities, loans, and borrowings	-595	-654
Stock-based compensation	1,151	1,182
Provision for loan losses	623	1,000
Amortization of mortgage servicing rights	104	117
Income from bank-owned life insurance policies	-273	-289
Net (gain) loss from sale of loans and other assets	176	-128
Net change in loans originated for sale	-189	-7
Change in other assets and liabilities	-5,446	105
Net cash provided by operating activities	22,014	27,926
Investing activities:
Proceeds from maturities of available-for-sale investment securities	36,670	19,231
Proceeds from maturities of other investment securities	6,404	11
Purchases of available-for-sale investment securities	-153,211	-260,923
Purchases of other securities	0	-3,384
Net decrease in loans	70,013	10,389
Cash paid for acquisition, net of cash acquired of $0	0	-924
Purchases of premises and equipment, net	-3,321	-1,395
Net cash used in investing activities	-43,445	-236,995
Financing activities:
Net increase in deposits	191,283	142,844
Net change in borrowings, net of payments of $0 and $3	-142,300	75,197
Issuance of common stock	2,941	4,844
Purchase of treasury stock	-9,125	0
Issuance of treasury stock	2,247	0
Cash dividends paid	-12,174	-11,291
Tax benefits from share-based payment arrangements	696	1,245
Net cash provided by financing activities	33,568	212,839
Change in cash and cash equivalents	12,137	3,770
Cash and cash equivalents at beginning of period	138,396	149,647
Cash and cash equivalents at end of period	150,533	153,417
Supplemental disclosures of cash flow information:
Cash paid for interest	2,642	3,182
Cash paid for income taxes	5,707	164
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	12,306	11,355
Transfers from loans to other real estate	$521	$763

CONSOLIDATED_STATEMENTS_OF_CAS1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investing activities:
Cash acquired from acquisition	$0	$0
Financing activities:
Payment made on borrowings	$0	$3

BASIS_OF_PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2015
BASIS OF PRESENTATION [Abstract]
BASIS OF PRESENTATION	NOTE A:  BASIS OF PRESENTATION
	The interim financial data as of and for the three months ended March 31, 2015 is unaudited; however, in the opinion of Community Bank System, Inc. (the “Company”), the interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods in conformity with generally accepted accounting principles (“GAAP”).  The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period.

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Mar. 31, 2015
ACQUISITIONS [Abstract]
ACQUISITIONS	NOTE B:  ACQUISITIONS
	On January 1, 2014, the Company, through its subsidiary, Harbridge Consulting Group, LLC (“Harbridge”), completed its acquisition of a professional services practice from EBS-RMSCO, Inc., a subsidiary of The Lifetime Healthcare Companies (“EBS-RMSCO”).  This professional services practice, which provides actuarial valuation and consulting services to clients who sponsor pension and post-retirement medical and welfare plans, enhances the Company’s participation in the Western New York market.  The effects of the acquired assets and liabilities have been included in the consolidated financial statements since that date.
	The assets and liabilities assumed in the acquisitions were recorded at their estimated fair values based on management's best estimates using information available at the dates of the acquisition, and are subject to adjustment based on updated information not available at the time of acquisition.  The following table summarizes the estimated fair value of the assets acquired and liabilities assumed during 2014:
	(000’s omitted)
	Consideration paid/(received):
	Cash/Total net consideration paid/(received)	$	924
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Other assets/( liabilities), net		163
	Other intangibles		578
	Total identifiable assets/(liabilities), net		741
	Goodwill	$	183
	The core deposit intangible and other intangibles related to the EBS-RMSCO acquisition is being amortized using an accelerated method over their estimated useful life of eight years.  The goodwill, which is not amortized for book purposes, was assigned to the Employee Benefit Services segment for the EBS-RMSCO acquisition and is deductible for tax purposes.
	Direct costs related to the acquisitions were expensed as incurred.  Merger and acquisition integration-related expenses amount to $0.4 million and $0.1 million in the three months ended March 31, 2015 and 2014, respectively, and have been separately stated in the Consolidated Statements of Income.
	Supplemental pro forma financial information related to the EBS-RMSCO acquisition has not been provided as it would be impracticable to do so.  Historical financial information regarding the acquired branches is not accessible and, thus, the amounts would require estimates so significant as to render the disclosure irrelevant.
	On February 24, 2015, the Company announced that it had entered into a definitive agreement to acquire Oneida Financial Corp. (“Oneida”), parent company of Oneida Savings Bank, headquartered in Oneida, NY, for approximately $142 million in Company stock and cash.  The acquisition will extend the Company’s Central New York banking service area and complement and expand the Company’s existing service capacity in insurance, benefits administration and wealth management.  Upon the completion of the merger, Community Bank will add 12 branch locations and approximately $800 million of assets, including loans of $370 million and $690 million of deposits.  The acquisition is expected to close during the third quarter of 2015, pending both customary regulatory and Oneida shareholder approval.  The Company expects to incur certain one-time, transaction-related costs in 2015.

ACCOUNTING_POLICIES

ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2015
ACCOUNTING POLICIES [Abstract]
ACCOUNTING POLICIES	NOTE C:  ACCOUNTING POLICIES
	The accounting policies of the Company, as applied in the consolidated interim financial statements presented herein, are substantially the same as those followed on an annual basis as presented on pages 55 through 60 of the Annual Report on Form 10-K for the year ended December 31, 2014 filed with the Securities and Exchange Commission (“SEC”) on March 2, 2015.
	Critical Accounting Policies
	Acquired loans
	Acquired loans are initially recorded at their acquisition date fair values.  The carryover of allowance for loan losses is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. Fair values for acquired loans are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, prepayment risk, liquidity risk, default rates, loss severity, payment speeds, collateral values and discount rate.
	Acquired impaired loans
	Acquired loans that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments are accounted for as impaired loans under ASC 310-30.  The excess of undiscounted cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized into interest income over the remaining life of the loans using the interest method. The difference between contractually required payments at acquisition and the undiscounted cash flows expected to be collected at acquisition is referred to as the non-accretable discount. The non-accretable discount represents estimated future credit losses and other contractually required payments that the Company does not expect to collect. Subsequent decreases in expected cash flows are recognized as impairments through a charge to the provision for credit losses resulting in an increase in the allowance for loan losses. Subsequent improvements in expected cash flows result in a recovery of previously recorded allowance for loan losses or a reversal of a corresponding amount of the non-accretable discount, which the Company then reclassifies as an accretable discount that is recognized into interest income over the remaining life of the loans using the interest method.
	Acquired loans that met the criteria for non-accrual of interest prior to acquisition may be considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company can reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans. As such, the Company may no longer consider the loan to be non-accrual or non-performing and may accrue interest on these loans, including the impact of any accretable discount.
	Acquired non-impaired loans
	Acquired loans that do not meet the requirements under ASC 310-30 are considered acquired non-impaired loans. The difference between the acquisition date fair value and the outstanding balance represents the fair value adjustment for a loan and includes both credit and interest rate considerations. Fair value adjustments may be discounts (or premiums) to a loan’s cost basis and are accreted (or amortized) to net interest income (or expense) over the loan’s remaining life in accordance with ASC 310- 20. Fair value adjustments for revolving loans are accreted (or amortized) using a straight line method. Term loans are accreted (or amortized) using the constant effective yield method.
	Subsequent to the purchase date, the methods used to estimate the allowance for loan losses for the acquired non-impaired loans is consistent with the policy described below.  However, the Company compares the net realizable value of the loans to the carrying value, for loans collectively evaluated for impairment.  The carrying value represents the net of the loan’s unpaid principal balance and the remaining purchase discount (or premium) that has yet to be accreted into interest income.  When the carrying value exceeds the net realizable value, an allowance for loan losses is recognized.
	Allowance for Loan Losses
	Management continually evaluates the credit quality of the Company’s loan portfolio, and performs a formal review of the adequacy of the allowance for loan losses on a quarterly basis.  The allowance reflects management’s best estimate of probable losses inherent in the loan portfolio.  Determination of the allowance is subjective in nature and requires significant estimates.   The Company’s allowance methodology consists of two broad components - general and specific loan loss allocations.
	The general loan loss allocation is composed of two calculations that are computed on five main loan segments:  business lending, consumer installment - direct, consumer installment - indirect, home equity and consumer mortgage.  The first calculation is quantitative and determines an allowance level based on the latest 36 months of historical net charge-off data for each loan class (commercial loans exclude balances with specific loan loss allocations).  The second calculation is qualitative and takes into consideration eight qualitative environmental factors:  levels and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards, and other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations.    A component of the qualitative calculation is the unallocated allowance for loan loss.  The qualitative and quantitative calculations are added together to determine the general loan loss allocation.  The specific loan loss allocation relates to individual commercial loans that are both greater than $0.5 million and in a nonaccruing status with respect to interest.  Specific loan losses are based on discounted estimated cash flows, including any cash flows resulting from the conversion of collateral or collateral shortfalls.  The allowance levels computed from the specific and general loan loss allocation methods are combined with unallocated allowances and allowances needed for acquired loans to derive the total required allowance for loan losses to be reflected on the Consolidated Statement of Condition.
	Loan losses are charged off against the allowance, while recoveries of amounts previously charged off are credited to the allowance.  A provision for loan losses is charged to operations based on management’s periodic evaluation of factors previously mentioned.
	Investment Securities
	The Company has classified its investments in debt and equity securities as held-to-maturity or available-for-sale.  Held-to-maturity securities are those for which the Company has the positive intent and ability to hold until maturity, and are reported at cost, which is adjusted for amortization of premiums and accretion of discounts.  During December 2013, the Company reclassified its held-to-maturity portfolio to available-for-sale and consequently has not used the held-to-maturity classification since.  Securities classified as available-for-sale are reported at fair value with net unrealized gains and losses reflected as a separate component of shareholders' equity, net of applicable income taxes.  None of the Company's investment securities have been classified as trading securities at March 31, 2015.  Certain equity securities are stated at cost and include restricted stock of the Federal Reserve Bank of New York (“Federal Reserve”) and Federal Home Loan Bank of New York (“FHLB”).
	Fair values for investment securities are based upon quoted market prices, where available.  If quoted market prices are not available, fair values are based upon quoted market prices of comparable instruments, or a discounted cash flow model using market estimates of interest rates and volatility.
	The Company conducts an assessment of all securities in an unrealized loss position to determine if other-than-temporary impairment (“OTTI”) exists on a quarterly basis. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis.  The OTTI assessment considers the security structure, recent security collateral performance metrics, if applicable, external credit ratings, failure of the issuer to make scheduled interest or principal payments, judgment about and expectations of future performance, and relevant independent industry research, analysis and forecasts. The severity of the impairment and the length of time the security has been impaired is also considered in the assessment.  The assessment of whether an OTTI decline exists is performed on each security, regardless of the classification of the security as available-for-sale or held-to-maturity and involves a high degree of subjectivity and judgment that is based on the information available to management at a point in time.
	An OTTI loss must be recognized for a debt security in an unrealized loss position if there is intent to sell the security or it is more likely than not the Company will be required to sell the security prior to recovery of its amortized cost basis. In this situation, the amount of loss recognized in income is equal to the difference between the fair value and the amortized cost basis of the security. Even if management does not have the intent, and it is not more likely than not that the Company will be required to sell the securities, an evaluation of the expected cash flows to be received is performed to determine if a credit loss has occurred. For debt securities, a critical component of the evaluation for OTTI is the identification of credit-impaired securities, where the Company does not expect to receive cash flows sufficient to recover the entire amortized cost basis of the security.  In the event of a credit loss, only the amount of impairment associated with the credit loss would be recognized in income. The portion of the unrealized loss relating to other factors, such as liquidity conditions in the market or changes in market interest rates, is recorded in accumulated other comprehensive loss.
	Equity securities are also evaluated to determine whether the unrealized loss is expected to be recoverable based on whether evidence exists to support a realizable value equal to or greater than the amortized cost basis. If it is probable that the amortized cost basis will not be recovered, taking into consideration the estimated recovery period and the ability to hold the equity security until recovery, OTTI is recognized in earnings equal to the difference between the fair value and the amortized cost basis of the security.
	The specific identification method is used in determining the realized gains and losses on sales of investment securities and OTTI charges.  Premiums and discounts on securities are amortized and accreted, respectively, on the interest method basis over the period to maturity or estimated life of the related security.  Purchases and sales of securities are recognized on a trade date basis.
	Intangible Assets
	Intangible assets include core deposit intangibles, customer relationship intangibles and goodwill arising from acquisitions. Core deposit intangibles and customer relationship intangibles are amortized on either an accelerated or straight-line basis over periods ranging from seven to 20 years. The initial and ongoing carrying value of goodwill and other intangible assets is based upon discounted cash flow modeling techniques that require management to make estimates regarding the amount and timing of expected future cash flows.  It also requires use of a discount rate that reflects the current return requirements of the market in relation to present risk-free interest rates, required equity market premiums, peer volatility indicators, and company-specific risk indicators.
	The Company evaluates goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment.  The implied fair value of a reporting unit’s goodwill is compared to its carrying amount and the impairment loss is measured by the excess of the carrying value over fair value.  The fair value of each reporting unit is compared to the carrying amount of that reporting unit in order to determine if impairment is indicated.
	Retirement Benefits
	The Company provides defined benefit pension benefits to eligible employees and post-retirement health and life insurance benefits to certain eligible retirees.  The Company also provides deferred compensation and supplemental executive retirement plans for selected current and former employees, officers, and directors.  Expense under these plans is charged to current operations and consists of several components of net periodic benefit cost based on various actuarial assumptions regarding future experience under the plans, including discount rate, rate of future compensation increases and expected return on plan assets.
	New Accounting Pronouncements
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606).  This new guidance supersedes the revenue recognition requirements in ASC 605, Revenue Recognition, and is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects consideration to which the entity expects to be entitled in exchange for those goods and services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  This guidance is effective prospectively for the Company for annual and interim periods beginning after December 15, 2016.  The Company is currently evaluating the effect the guidance will have on the Company’s consolidated financial statements.

INVESTMENT_SECURITIES

INVESTMENT SECURITIES	3 Months Ended
	Mar. 31, 2015
INVESTMENT SECURITIES [Abstract]
INVESTMENT SECURITIES	NOTE D:  INVESTMENT SECURITIES
	The amortized cost and estimated fair value of investment securities as of March 31, 2015 and December 31, 2014 are as follows:
		31-Mar-15								31-Dec-14
				Gross		Gross						Gross		Gross
		Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
	(000's omitted)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
	Available-for-Sale Portfolio:
	U.S. Treasury and agency securities	$	1,606,766	$	69,346	$	0	$	1,676,112	$	1,479,134	$	39,509	$	910	$	1,517,733
	Obligations of state and political subdivisions		645,979		27,041		311		672,709		645,398		26,749		244		671,903
	Government agency mortgage-backed securities		220,279		10,016		769		229,526		228,971		9,782		1,025		237,728
	Corporate debt securities		26,770		277		21		27,026		26,803		363		75		27,091
	Government agency collateralized mortgage obligations		16,307		673		0		16,980		17,330		695		0		18,025
	Marketable equity securities		250		178		2		426		250		195		0		445
	Total available-for-sale portfolio	$	2,516,351	$	107,531	$	1,103	$	2,622,779	$	2,397,886	$	77,293	$	2,254	$	2,472,925
	Other Securities:
	Federal Home Loan Bank common stock	$	13,149					$	13,149	$	19,553					$	19,553
	Federal Reserve Bank common stock		16,050						16,050		16,050						16,050
	Other equity securities		4,446						4,446		4,446						4,446
	Total other securities	$	33,645					$	33,645	$	40,049					$	40,049
	A summary of investment securities that have been in a continuous unrealized loss position for less than, or greater than, twelve months is as follows:
	As of March 31, 2015
		Less than 12 Months						12 Months or Longer						Total
						Gross						Gross						Gross
				Fair		Unrealized				Fair		Unrealized				Fair		Unrealized
	(000's omitted)		#	Value		Losses			#	Value		Losses			#	Value		Losses
	Available-for-Sale Portfolio:
	Obligations of state and political subdivisions		31	$	18,327	$	271		3	$	1,209	$	40		34	$	19,536	$	311
	Government agency mortgage-backed securities		2		2		0		19		34,302		769		21		34,304		769
	Corporate debt securities		0		0		0		1		2,792		21		1		2,792		21
	Government agency collateralized mortgage obligations		1		0		0		1		5		0		2		5		0
	Marketable equity securities		1		99		2		0		0		0		1		99		2
	Total available-for-sale/investment portfolio		35	$	18,428	$	273		24	$	38,308	$	830		59	$	56,736	$	1,103
	As of December 31, 2014
		Less than 12 Months						12 Months or Longer						Total
						Gross						Gross						Gross
				Fair		Unrealized				Fair		Unrealized				Fair		Unrealized
	(000's omitted)		#	Value		Losses			#	Value		Losses			#	Value		Losses
	Available-for-Sale Portfolio:
	U.S. Treasury and agency obligations		0	$	0	$	0		4	$	102,363	$	910		4	$	102,363	$	910
	Obligations of state and political subdivisions		23		13,413		34		46		26,490		210		69		39,903		244
	Government agency mortgage-backed securities		3		5		0		19		34,770		1,025		22		34,775		1,025
	Corporate debt securities		1		3,040		1		1		2,755		74		2		5,795		75
	Government agency collateralized mortgage obligations		1		0		0		1		5		0		2		5		0
	Total available-for-sale/investment portfolio		28	$	16,458	$	35		71	$	166,383	$	2,219		99	$	182,841	$	2,254
	The unrealized losses reported pertaining to securities issued by the U.S. government and its sponsored entities, include treasuries, agencies, and mortgage-backed securities issued by GNMA, FNMA and FHLMC which are currently rated AAA by Moody’s Investor Services, AA+ by Standard & Poor’s and are guaranteed by the U.S. government. The majority of the obligations of state and political subdivisions and corporations carry a credit rating of A or better.  Additionally, a majority of the obligations of state and political subdivisions carry a secondary level of credit enhancement. The Company does not intend to sell these securities, nor is it more likely than not that the Company will be required to sell these securities prior to recovery of the amortized cost. The unrealized losses in the portfolios are primarily attributable to changes in interest rates.  As such, management does not believe any individual unrealized loss as of March 31, 2015 represents OTTI.
	The amortized cost and estimated fair value of debt securities at March 31, 2015, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Securities not due at a single maturity date are shown separately.
		Available-for-Sale
		Amortized		Fair
	(000's omitted)	Cost		Value
	Due in one year or less	$	40,781	$	41,170
	Due after one through five years		163,322		167,984
	Due after five years through ten years		1,834,409		1,914,623
	Due after ten years		241,003		252,070
	Subtotal		2,279,515		2,375,847
	Government agency mortgage-backed securities		220,279		229,526
	Government agency collateralized mortgage obligations		16,307		16,980
	Total	$	2,516,101	$	2,622,353

LOANS

LOANS	3 Months Ended
	Mar. 31, 2015
LOANS [Abstract]
LOANS	NOTE E:  LOANS
	The segments of the Company’s loan portfolio are disaggregated into the following classes that allow management to monitor risk and performance:
		·	Consumer mortgages consist primarily of fixed rate residential instruments, typically 10 – 30 years in contractual term, secured by first liens on real property.
		·	Business lending is comprised of general purpose commercial and industrial loans including, but not limited to agricultural-related and dealer floor plans, as well as mortgages on commercial properties.
		·	Consumer indirect consists primarily of installment loans originated through selected dealerships and are secured by automobiles, marine and other recreational vehicles.
		·	Consumer direct consists of all other loans to consumers such as personal installment loans and lines of credit.
		·	Home equity products are consumer purpose installment loans or lines of credit most often secured by a first or second lien position on residential real estate with terms up to 30 years.
	The balances of these classes are summarized as follows:
			March 31,			December 31,
	(000's omitted)		2015			2014
	Consumer mortgage		$	1,605,019		$	1,613,384
	Business lending			1,239,529			1,262,484
	Consumer indirect			804,300			833,968
	Consumer direct			176,084			184,028
	Home equity			338,979			342,342
	Gross loans, including deferred origination costs			4,163,911			4,236,206
	Allowance for loan losses			(45,005	)		(45,341	)
	Loans, net of allowance for loan losses		$	4,118,906		$	4,190,865
	The outstanding balance related to credit impaired acquired loans was $5.9 million and $6.1 million at March 31, 2015 and December 31, 2014, respectively.  The changes in the accretable discount related to the credit impaired acquired loans are as follows:
	(000’s omitted)
	Balance at December 31, 2014		$	705
	Accretion recognized, year-to-date			(151	)
	Net reclassification to accretable from nonaccretable			28
	Balance at March 31, 2015		$	582
	Credit Quality
	Management monitors the credit quality of its loan portfolio on an ongoing basis.  Measurement of delinquency and past due status are based on the contractual terms of each loan.  Past due loans are reviewed on a monthly basis to identify loans for non-accrual status.  The following is an aged analysis of the Company’s past due loans, by class as of March 31, 2015:
	Legacy Loans (excludes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Current			Total Loans
	Consumer mortgage		$	9,841		$	1,105		$	13,467		$	24,413		$	1,514,128		$	1,538,541
	Business lending			4,779			90			2,731			7,600			1,099,128			1,106,728
	Consumer indirect			6,419			51			0			6,470			796,892			803,362
	Consumer direct			863			29			2			894			170,276			171,170
	Home equity			1,642			50			2,078			3,770			277,685			281,455
	Total		$	23,544		$	1,325		$	18,278		$	43,147		$	3,858,109		$	3,901,256
	Acquired Loans (includes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total			Acquired
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Impaired(1)			Current		Total Loans
	Consumer mortgage		$	1,671		$	210		$	1,974		$	3,855		$	0		$	62,623	$	66,478
	Business lending			939			0			300			1,239			5,280			126,282		132,801
	Consumer indirect			29			0			0			29			0			909		938
	Consumer direct			80			0			18			98			0			4,816		4,914
	Home equity			401			164			414			979			0			56,545		57,524
	Total		$	3,120		$	374		$	2,706		$	6,200		$	5,280		$	251,175	$	262,655
	-1	Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30.  As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.
	The following is an aged analysis of the Company’s past due loans by class as of December 31, 2014:
	Legacy Loans (excludes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Current			Total Loans
	Consumer mortgage		$	13,978		$	2,165		$	13,201		$	29,344		$	1,515,057		$	1,544,401
	Business lending			6,738			350			2,291			9,379			1,115,215			1,124,594
	Consumer indirect			10,529			82			10			10,621			822,124			832,745
	Consumer direct			1,389			36			2			1,427			177,158			178,585
	Home equity			1,802			195			2,172			4,169			278,904			283,073
	Total		$	34,436		$	2,828		$	17,676		$	54,940		$	3,908,458		$	3,963,398
	Acquired Loans (includes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total			Acquired
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Impaired(1)			Current		Total Loans
	Consumer mortgage		$	1,892		$	232		$	2,122		$	4,246		$	0		$	64,737	$	68,983
	Business lending			608			0			489			1,097			5,312			131,481		137,890
Consumer indirect			40			0			0			40			0			1,183		1,223
Consumer direct			174			0			18			192			0			5,251		5,443
Home equity			674			46			426			1,146			0			58,123		59,269
Total		$	3,388		$	278		$	3,055		$	6,721		$	5,312		$	260,775	$	272,808
-1	Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30.  As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.
The Company uses several credit quality indicators to assess credit risk in an ongoing manner.  The Company’s primary credit quality indicator for its business lending portfolio is an internal credit risk rating system that categorizes loans as “pass”, “special mention”, or “classified”.  Credit risk ratings are applied individually to those classes of loans that have significant or unique credit characteristics that benefit from a case-by-case evaluation.  In general, the following are the definitions of the Company’s credit quality indicators:
Pass	The condition of the borrower and the performance of the loans are satisfactory or better.
Special Mention	The condition of the borrower has deteriorated although the loan performs as agreed.
Classified	The condition of the borrower has significantly deteriorated and the performance of the loan could further deteriorate, if deficiencies are not corrected.
Doubtful	The condition of the borrower has deteriorated to the point that collection of the balance is improbable based on current facts and conditions.
The following table shows the amount of business lending loans by credit quality category:
		31-Mar-15									31-Dec-14
(000’s omitted)		Legacy			Acquired			Total			Legacy			Acquired			Total
Pass		$	936,556		$	90,340		$	1,026,896		$	949,960		$	93,510		$	1,043,470
Special mention			100,507			16,785			117,292			103,176			18,038			121,214
Classified			69,665			20,396			90,061			71,458			21,030			92,488
Doubtful			0			0			0			0			0			0
Acquired impaired			0			5,280			5,280			0			5,312			5,312
Total		$	1,106,728		$	132,801		$	1,239,529		$	1,124,594		$	137,890		$	1,262,484
All other loans are underwritten and structured using standardized criteria and characteristics, primarily payment performance, and are normally risk rated and monitored collectively on a monthly basis.  These are typically loans to individuals in the consumer categories and are delineated as either performing or nonperforming.   Performing loans include current, 30 - 89 days past due and acquired impaired loans.  Nonperforming loans include 90+ days past due and still accruing and nonaccrual loans. The following table details the balances in all other loan categories at March 31, 2015:
Legacy loans (excludes loans acquired after January 1, 2009)
		Consumer			Consumer			Consumer			Home
(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
Performing		$	1,523,969		$	803,311		$	171,139		$	279,327		$	2,777,746
Nonperforming			14,572			51			31			2,128			16,782
Total		$	1,538,541		$	803,362		$	171,170		$	281,455		$	2,794,528
Acquired loans (includes loans acquired after January 1, 2009)
		Consumer			Consumer			Consumer			Home
(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
Performing		$	64,294		$	938		$	4,896		$	56,946		$	127,074
Nonperforming			2,184			0			18			578			2,780
Total		$	66,478		$	938		$	4,914		$	57,524		$	129,854
The following table details the balances in all other loan categories at December 31, 2014:
Legacy loans (excludes loans acquired after January 1, 2009)
		Consumer			Consumer			Consumer			Home
(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
Performing		$	1,529,035		$	832,653		$	178,547		$	280,706		$	2,820,941
Nonperforming			15,366			92			38			2,367			17,863
Total		$	1,544,401		$	832,745		$	178,585		$	283,073		$	2,838,804
Acquired loans (includes loans acquired after January 1, 2009)
		Consumer			Consumer			Consumer			Home
(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
Performing		$	66,629		$	1,223		$	5,425		$	58,797		$	132,074
Nonperforming			2,354			0			18			472			2,844
Total		$	68,983		$	1,223		$	5,443		$	59,269		$	134,918
All loan classes are collectively evaluated for impairment except business lending, as described in Note C.  A summary of individually evaluated impaired loans as of March 31, 2015 and December 31, 2014 follows:
		March 31,			December 31,
(000’s omitted)		2015			2014
Loans with allowance allocation		$	0		$	0
Loans without allowance allocation			645			0
Carrying balance			645			0
Contractual balance			645			0
Specifically allocated allowance			0			0
In the course of working with borrowers, the Company may choose to restructure the contractual terms of certain loans.  In this scenario, the Company attempts to work-out an alternative payment schedule with the borrower in order to optimize collectability of the loan.  Any loans that are modified are reviewed by the Company to identify if a troubled debt restructuring (“TDR”) has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Company grants a concession to the borrower that it would not otherwise consider.  Terms may be modified to fit the ability of the borrower to repay in line with its current financial standing and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms, or a combination of the two.  With regard to determination of the amount of the allowance for loan losses, troubled debt restructured loans are considered to be impaired.  As a result, the determination of the amount of allowance for loan losses related to impaired loans for each portfolio segment within TDRs is the same as detailed previously.
In accordance with the clarified guidance issued by the Office of the Comptroller of the Currency (“OCC”), loans that have been discharged in Chapter 7 bankruptcy but not reaffirmed by the borrower, are classified as TDRs, irrespective of payment history or delinquency status, even if the repayment terms for the loan have not been otherwise modified.  The Company’s lien position against the underlying collateral remains unchanged.  Pursuant to that guidance, the Company records a charge-off equal to any portion of the carrying value that exceeds the net realizable value of the collateral.  The amount of loss incurred in 2015 and 2014 was immaterial.
TDRs less than $0.5 million are collectively included in the general loan loss allocation and the qualitative review, if necessary.  Commercial loans greater than $0.5 million are individually evaluated for impairment, and if necessary, a specific allocation of the allowance for loan losses is provided.
Information regarding TDRs as of March 31, 2015 and December 31, 2014 is as follows:
		31-Mar-15																	31-Dec-14
(000’s omitted)		Nonaccrual						Accruing						Total					Nonaccrual						Accruing				Total
			#		Amount				#		Amount				#		Amount			#		Amount				#	Amount			#	Amount
Consumer mortgage			49		$	2,059			36		$	1,641			85		$	3,700		49		$	2,092			37	$	1,770		86	$	3,862
Business lending			4			307			3			463			7			770		6			442			3		468		9		910
Consumer indirect			0			0			75			649			75			649		0			0			79		615		79		615
Consumer direct			0			0			22			62			22			62		0			0			25		69		25		69
Home equity			13			127			13			271			26			398		13			218			13		278		26		496
Total			66		$	2,493			149		$	3,086			215		$	5,579		68		$	2,752			157	$	3,200		225	$	5,952
The following table presents information related to loans modified in a TDR during the three months ended March 31, 2015 and 2014.  Of the loans noted in the table below, all loans for the three months ended March 31, 2015 and 2014 were modified due to a Chapter 7 bankruptcy as described previously.  The financial effects of these restructurings were immaterial.
		Three Month Ended March 31, 2015						Three Month Ended March 31, 2014
(000’s omitted)		Number of loans modified			Outstanding Balance			Number of loans modified			Outstanding Balance
Consumer mortgage			4		$	213			11		$	533
Business lending			0			0			4			192
Consumer indirect			7			101			12			112
Consumer direct			1			4			2			10
Home equity			1			15			1			30
Total			13		$	333			30		$	877
Allowance for Loan Losses
The allowance for loan losses is general in nature and is available to absorb losses from any loan type despite the analysis below.  The following presents by class the activity in the allowance for loan losses:
		Three Months Ended March 31, 2015
		Consumer			Business			Consumer			Consumer			Home					Acquired
(000’s omitted)		Mortgage			Lending			Indirect			Direct			Equity			Unallocated		Impaired			Total
Beginning balance		$	10,286		$	15,787		$	11,544		$	3,083		$	2,701		$	1,767	$	173		$	45,341
Charge-offs			(443	)		(133	)		(1,427	)		(345	)		(66	)		0		0			(2,414	)
Recoveries			21			82			1,152			193			7			0		0			1,455
Provision			369			(331	)		(23	)		(52	)		21			616		23			623
Ending balance		$	10,233		$	15,405		$	11,246		$	2,879		$	2,663		$	2,383	$	196		$	45,005
		Three Months Ended March 31, 2014
		Consumer			Business			Consumer			Consumer			Home					Acquired
(000’s omitted)		Mortgage			Lending			Indirect			Direct			Equity			Unallocated		Impaired			Total
Beginning balance		$	8,994		$	17,507		$	10,248		$	3,181		$	1,830		$	2,029	$	530		$	44,319
Charge-offs			(167	)		(120	)		(1,427	)		(492	)		(129	)		0		(13	)		(2,348	)
Recoveries			41			171			796			212			6			0		0			1,226
Provision			413			(512	)		969			186			111			149		(316	)		1,000
Ending balance		$	9,281		$	17,046		$	10,586		$	3,087		$	1,818		$	2,178	$	201		$	44,197

GOODWILL_AND_IDENTIFIABLE_INTA

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2015
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS [Abstract]
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	NOTE F:  GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
	The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows:
		31-Mar-15									31-Dec-14
		Gross						Net			Gross					Net
		Carrying			Accumulated			Carrying			Carrying		Accumulated			Carrying
	(000's omitted)	Amount			Amortization			Amount			Amount		Amortization			Amount
	Amortizing intangible assets:
	Core deposit intangibles	$	40,326		$	(31,042	)	$	9,284		$	40,326	$	(30,303	)	$	10,023
	Other intangibles		10,019			(8,423	)		1,596			10,019		(8,243	)		1,776
	Total amortizing intangibles	$	50,345		$	(39,465	)	$	10,880		$	50,345	$	(38,546	)	$	11,799
	The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows:
	Apr - Dec 2015	$	2,489
	2016		2,612
	2017		1,908
	2018		1,424
	2019		1,002
	Thereafter		1,445
	Total	$	10,880
	Shown below are the components of the Company’s goodwill at December 31, 2014 and March 31, 2015:
	(000’s omitted)	31-Dec-14			Activity			31-Mar-15
	Goodwill	$	379,998		$	0		$	379,998
	Accumulated impairment		(4,824	)		0			(4,824	)
	Goodwill, net	$	375,174		$	0		$	375,174

MANDATORILY_REDEEMABLE_PREFERR

MANDATORILY REDEEMABLE PREFERRED SECURITIES	3 Months Ended
	Mar. 31, 2015
MANDATORILY REDEEMABLE PREFERRED SECURITIES [Abstract]
MANDATORILY REDEEMABLE PREFERRED SECURITIES	NOTE G:  MANDATORILY REDEEMABLE PREFERRED SECURITIES
	The Company sponsors two business trusts, Community Statutory Trust III and Community Capital Trust IV, of which 100% of the common stock is owned by the Company.  The trusts were formed for the purpose of issuing company-obligated mandatorily redeemable preferred securities to third-party investors and investing the proceeds from the sale of such preferred securities solely in junior subordinated debt securities of the Company.  The debentures held by each trust are the sole assets of that trust.  Distributions on the preferred securities issued by each trust are payable quarterly at a rate per annum equal to the interest rate being earned by the trust on the debentures held by that trust and are recorded as interest expense in the consolidated financial statements.  The preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the debentures.  The Company has entered into agreements which, taken collectively, fully and unconditionally guarantee the preferred securities subject to the terms of each of the guarantees.  The terms of the preferred securities of each trust are as follows:
		Issuance	Par			Maturity
	Trust	Date	Amount		Interest Rate	Date	Call Price
	III	7/31/01	$	24.5 million	3 month LIBOR plus 3.58% (3.83%)	7/31/31	Par
	IV	12/8/06	$	75 million	3 month LIBOR plus 1.65% (1.92%)	12/15/36	Par

BENEFIT_PLANS

BENEFIT PLANS	3 Months Ended
	Mar. 31, 2015
BENEFIT PLANS [Abstract]
BENEFIT PLANS	NOTE H:  BENEFIT PLANS
	The Company provides a qualified defined benefit pension to eligible employees and retirees, other post-retirement health and life insurance benefits to certain retirees, an unfunded supplemental pension plan for certain key executives, and an unfunded stock balance plan for certain of its nonemployee directors.  The Company accrues for the estimated cost of these benefits through charges to expense during the years that employees earn these benefits.  No contributions to the defined benefit pension plan are required or planned for 2015.
	The net periodic benefit cost for the three months ended March 31, 2015 and 2014 is as follows:
		Pension Benefits						Post-retirement Benefits
		Three Months Ended						Three Months Ended
		March 31,						March 31,
	(000's omitted)	2015			2014			2015			2014
	Service cost	$	831		$	882		$	0		$	0
	Interest cost		1,375			1,318			22			27
	Expected return on plan assets		(3,042	)		(2,980	)		0			0
	Amortization of unrecognized net loss		366			(77	)		(3	)		0
	Amortization of prior service cost		2			1			(45	)		(45	)
	Net periodic benefit cost	$	(468	)	$	(856	)	$	(26	)	$	(18	)

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2015
EARNINGS PER SHARE [Abstract]
EARNINGS PER SHARE	NOTE I:  EARNINGS PER SHARE
	Basic earnings per share are computed based on the weighted-average of the common shares outstanding for the period.  Diluted earnings per share are based on the weighted-average of the shares outstanding adjusted for the dilutive effect of restricted stock and the assumed exercise of stock options during the year.  The dilutive effect of options is calculated using the treasury stock method of accounting.  The treasury stock method determines the number of common shares that would be outstanding if all the dilutive options (those where the average market price is greater than the exercise price) were exercised and the proceeds were used to repurchase common shares in the open market at the average market price for the applicable time period.  There were approximately 0.3 million weighted-average anti-dilutive stock options outstanding for the three months ended March 31, 2015, compared to approximately 0.04 million weighted-average anti-dilutive stock options outstanding for the three months ended March 31, 2014 that were not included in the computation below.
	The following is a reconciliation of basic to diluted earnings per share for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31,
	(000's omitted, except per share data)	2015			2014
	Net income	$	22,297		$	22,173
	Income attributable to unvested stock-based compensation awards		(100	)		(99	)
	Income available to common shareholders		22,197		$	22,074
	Weighted-average common shares outstanding – basic		40,659			40,458
	Basic earnings per share	$	0.55		$	0.55
	Net income	$	22,297		$	22,173
	Income attributable to unvested stock-based compensation awards		(100	)		(99	)
	Income available to common shareholders		22,197		$	22,074
	Weighted-average common shares outstanding – basic		40,659			40,458
	Assumed exercise of stock options		405			512
	Weighted-average common shares outstanding – diluted		41,064			40,970
	Diluted earnings per share	$	0.54		$	0.54
	Stock Repurchase Program
	At its December 2014 meeting, the Company’s Board of Directors (the “Board”) approved a new repurchase program authorizing the repurchase of up to 2,000,000 shares of the Company’s common stock, in accordance with securities laws and regulations, through December 31, 2015.  Any repurchased shares will be used for general corporate purposes, including those related to stock plan activities.  The timing and extent of repurchases will depend on market conditions and other corporate considerations as determined at the Company’s discretion.  During the first three months of 2015 the Company repurchased 265,230 shares of its common stock in open market transactions, compared to 123,000 shares repurchased during 2014.

COMMITMENTS_CONTINGENT_LIABILI

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS	3 Months Ended
	Mar. 31, 2015
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS [Abstract]
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS	NOTE J:  COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS
	The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments consist primarily of commitments to extend credit and standby letters of credit.  Commitments to extend credit are agreements to lend to customers, generally having fixed expiration dates or other termination clauses that may require payment of a fee.  These commitments consist principally of unused commercial and consumer credit lines.  Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of an underlying contract with a third party.  The credit risks associated with commitments to extend credit and standby letters of credit are essentially the same as that involved with extending loans to customers and are subject to the Company’s normal credit policies.  Collateral may be obtained based on management’s assessment of the customer’s creditworthiness.  The fair value of the standby letters of credit is immaterial for disclosure.
	The contract amount of commitments and contingencies are as follows:
	(000's omitted)	March 31,		December 31,
		2015		2014
	Commitments to extend credit	$	786,327	$	733,827
	Standby letters of credit		22,788		23,916
	Total	$	809,115	$	757,743
	The Company and its subsidiaries are subject in the normal course of business to various pending and threatened legal proceedings in which claims for monetary damages are asserted. As of March 31, 2015, management, after consultation with legal counsel, does not anticipate that the aggregate ultimate liability arising out of litigation pending or threatened against the Company or its subsidiaries will be material to the Company’s consolidated financial position. On at least a quarterly basis the Company assesses its liabilities and contingencies in connection with such legal proceedings. For those matters where it is probable that the Company will incur losses and the amounts of the losses can be reasonably estimated, the Company records an expense and corresponding liability in its consolidated financial statements. To the extent the pending or threatened litigation could result in exposure in excess of that liability, the amount of such excess is not currently estimable. The range of reasonably possible losses for matters where an exposure is not currently estimable or considered probable, beyond the existing recorded liabilities, is between $0 and $1 million in the aggregate. Although the Company does not believe that the outcome of pending litigation will be material to the Company’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future.
	The Bank reached an agreement in principle to settle the first of two related class actions pending in the United States District Court for the Middle District of Pennsylvania which were commenced October 30, 2013 and May 29, 2014, respectively.  The first action alleged that notices provided by the Bank in connection with the repossession of the named plaintiff’s automobile failed to comply with certain requirements of the Pennsylvania and New York Uniform Commercial Code (UCC) and related statutes.  The plaintiff sought to pursue the action as a class action on behalf of herself and similarly situated plaintiffs who had their automobiles repossessed and sought to recover statutory damages under the UCC. The second action filed May 29, 2014 contained similar allegations, which the plaintiff also sought to pursue as a class action for statutory damages. In response to these actions, the Bank has contested the allegations that the notices were deficient, asserted various legal defenses and counterclaims, and opposed class certification.  On September 30, 2014, the Bank reached an agreement in principle to settle the first action for $2.8 million in exchange for release of all claims of the class members covered by these actions.  A litigation settlement charge of $2.8 million with respect to the settlement of the class actions was recorded in the third quarter of 2014.  In connection with this settlement, on March 25, 2015, the parties executed a settlement agreement and the plaintiff’s counsel filed a motion with the Court for preliminary approval.  The settlement is subject to the Court’s final approval following notice to the class members, including the ability of class members to oppose or opt-out of the settlement.
	On March 4, 2015, in connection with the pending merger of Oneida Financial Corp. into Community Bank System, Inc., a purported stockholder of Oneida Financial filed a lawsuit in New York Supreme Court, Oneida County, captioned Paul Parshall v. Richard B. Myers, et al.   On March 13, 2015, another purported stockholder filed a lawsuit in New York Supreme Court, Oneida County, captioned John Solak, v. Richard B. Myers et al.  On April 24, 2015, a third purported shareholder filed a lawsuit in the Circuit Court for Baltimore City, Maryland, captioned Linda Colvin v. Oneida Financial Corp, et al.  These lawsuits are brought on behalf of a putative class of Oneida Financial’s common stockholders and seek an order that they are properly maintainable as class actions.
	These complaints name Oneida Financial, Oneida Financial’s directors, and Community Bank System as defendants and generally allege that the Director Defendants breached their fiduciary duties by failing to maximize shareholder value in connection with the Merger, and that Community Bank System and/or Oneida Financial aided and abetted those alleged breaches of fiduciary duty.  The complaints allege that the director Defendants improperly favored Community Bank System and discouraged alternative bids by agreeing to the Merger Agreement’s non-solicitation provision and termination fee provision.  Plaintiffs cite that Community Bank System agreed in the Merger Agreement to appoint two of Oneida’s directors to the boards of Community Bank System and Community Bank, effective upon the closing of the Merger.  The complaints allege that the voting agreements entered into by Oneida Financial’s directors and certain executive officers to vote their shares in favor of the Merger Agreement were improper.  In addition, the complaints allege that the consideration to be received by Oneida Financial common stockholders is unreasonable, inadequate and unfair.  The complaints seek declaratory and injunctive relief to invalidate the Merger Agreement and prevent the consummation of the Merger. The complaints further seek unspecified damages, as well as costs including plaintiffs’ attorneys’ and experts’ fees.
	On or about April 10, 2015, plaintiffs in the Parshall and Solak actions filed amended complaints and moved to consolidate the actions and to appoint co-lead interim counsel for the Plaintiffs.  Community Bank did not oppose such motion and answered the amended complaints filed by plaintiffs in these actions.  The parties in these actions have further agreed to an expedited discovery and briefing schedule.
	Each of Community Bank System and Oneida Financial believes that the claims asserted are without merit and intends to vigorously defend against these lawsuits.

FAIR_VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2015
FAIR VALUE [Abstract]
FAIR VALUE	NOTE K:  FAIR VALUE
	Accounting standards allow entities an irrevocable option to measure certain financial assets and financial liabilities at fair value.  Unrealized gains and losses on items for which the fair value option has been elected are reported in earnings.  The Company has elected to value loans held for sale at fair value in order to more closely match the gains and losses associated with loans held for sale with the gains and losses on forward sales contracts.  Accordingly, the impact on the valuation will be recognized in the Company’s consolidated statement of income.  All mortgage loans held for sale are current and in performing status.
	Accounting standards establish a framework for measuring fair value and require certain disclosures about such fair value instruments.  It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e. exit price).  Inputs used to measure fair value are classified into the following hierarchy:
	●	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	●	Level 2 – Quoted prices in active markets for similar assets or liabilities, or quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability.
	●	Level 3 – Significant valuation assumptions not readily observable in a market.
	A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.  The following tables set forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis.  There were no transfers between any of the levels for the periods presented.
			31-Mar-15
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value
	Available-for-sale investment securities:
	U.S. Treasury and agency securities		$	1,676,112			$	0			$	0	$	1,676,112
	Obligations of state and political subdivisions			0				672,709				0		672,709
	Government agency mortgage-backed securities			0				229,526				0		229,526
	Corporate debt securities			0				27,026				0		27,026
	Government agency collateralized mortgage obligations			0				16,980				0		16,980
	Marketable equity securities			426				0				0		426
	Total available-for-sale investment securities			1,676,538				946,241				0		2,622,779
	Mortgage loans held for sale			0				1,437				0		1,437
	Commitments to originate real estate loans for sale			0				0				152		152
	Forward sales commitments			0				(22	)			0		(22	)
	Total		$	1,676,538			$	947,656			$	152	$	2,624,346
			31-Dec-14
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value
	Available-for-sale investment securities:
	U.S. Treasury and agency securities		$	1,496,667			$	21,066			$	0	$	1,517,733
	Obligations of state and political subdivisions			0				671,903				0		671,903
	Government agency mortgage-backed securities			0				237,728				0		237,728
	Corporate debt securities			0				27,091				0		27,091
	Government agency collateralized mortgage obligations			0				18,025				0		18,025
	Marketable equity securities			445				0				0		445
	Total available-for-sale investment securities			1,497,112				975,813				0		2,472,925
	Mortgage loans held for sale			0				1,042				0		1,042
	Commitments to originate real estate loans for sale			0				0				185		185
	Forward sales commitments			0				(43	)			0		(43	)
	Total		$	1,497,112			$	976,812			$	185	$	2,474,109
	The valuation techniques used to measure fair value for the items in the table above are as follows:
	·	Available for sale investment securities – The fair values of available-for-sale investment securities are based upon quoted prices, if available.  If quoted prices are not available, fair values are measured using quoted market prices for similar securities or model-based valuation techniques.  Level 1 securities include U.S. Treasury obligations and marketable equity securities that are traded by dealers or brokers in active over-the-counter markets.  Level 2 securities include U.S. agency securities, mortgage-backed securities issued by government-sponsored entities, municipal securities and corporate debt securities that are valued by reference to prices for similar securities or through model-based techniques in which all significant inputs, such as reported trades, trade execution data, LIBOR swap yield curve, market prepayment speeds, credit information, market spreads, and security’s terms and conditions, are observable.  See Note D for further disclosure of the fair value of investment securities.
	·	Mortgage loans held for sale – Mortgage loans held for sale are carried at fair value, which is determined using quoted secondary-market prices of loans with similar characteristics and, as such, have been classified as a Level 2 valuation.  The unpaid principal value of mortgage loans held for sale at March 31, 2015 is approximately $1.4 million.  The unrealized gain on mortgage loans held for sale of approximately $52,000 was recognized in mortgage banking and other income in the consolidated statement.
	·	Forward sales commitments – The Company enters into forward sales commitments to sell certain residential real estate loans.  Such commitments are considered to be derivative financial instruments and, therefore, are carried at estimated fair value in the other asset or other liability section of the consolidated balance sheet.  The fair value of these forward sales commitments is primarily measured by obtaining pricing from certain government-sponsored entities and reflects the underlying price the entity would pay the Company for an immediate sale on these mortgages.  As such, these instruments are classified as Level 2 in the fair value hierarchy.
	·	Commitments to originate real estate loans for sale – The Company enters into various commitments to originate residential real estate loans for sale.  Such commitments are considered to be derivative financial instruments and, therefore, are carried at estimated fair value in the other asset or other liability section of the consolidated balance sheet.  The estimated fair value of these commitments is determined using quoted secondary market prices obtained from certain government-sponsored entities.  Additionally, accounting guidance requires the expected net future cash flows related to the associated servicing of the loan to be included in the fair value measurement of the derivative.  The expected net future cash flows are based on a valuation model that calculates the present value of estimated net servicing income.  The valuation model incorporates assumptions that market participants would use in estimating future net servicing income.  Such assumptions include estimates of the cost of servicing loans, appropriate discount rate and prepayment speeds.  The determination of expected net cash flows is considered a significant unobservable input contributing to the Level 3 classification of commitments to originate real estate loans for sale.
	The changes in Level 3 assets measured at fair value on a recurring basis are summarized in the following tables:
			Three Months Ended
			March 31,
			2015				2014
	(000's omitted)		Commitments to Originate Real				Commitments to Originate Real
			Estate Loans for Sale				Estate Loans for Sale
	Beginning balance		$	185			$	44
	Total (losses)/gains included in earnings (1)			(185	)			(44	)
	Commitments to originate real estate loans held for sale, net			152				67
	Ending balance		$	152			$	67
	-1	Amounts included in earnings associated with the commitments to originate real estate loans for sale are reported as a component of other banking services in the Consolidated Statement of Income.
	Assets and liabilities measured on a non-recurring basis:
			31-Mar-15													31-Dec-14
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value			Level 1		Level 2		Level 3		Total Fair Value
	Other real estate owned		$	0			$	0			$	1,767	$	1,767		$	0	$	0	$	1,855	$	1,855
	Loans are generally not recorded at fair value on a recurring basis.  Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans.  Nonrecurring adjustments also include certain impairment amounts for collateral-dependent loans calculated when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation amount does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using independent appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace, adjusted for non-observable inputs.  Thus, the resulting nonrecurring fair value measurements are generally classified as Level 3. Estimates of fair value used for other collateral supporting commercial loans generally are based on assumptions not observable in the marketplace and, therefore, such valuations classify as Level 3.
	Other real estate owned (“OREO”) is valued at the time the loan is foreclosed upon and the asset is transferred to OREO. The value is based primarily on third party appraisals, less costs to sell. The appraisals are sometimes further discounted based on management’s historical knowledge, changes in market conditions from the time of valuation, and/or management’s expertise and knowledge of the customer and customer’s business. Such discounts are significant, ranging from 10% to 49% at March 31, 2015 and result in a Level 3 classification of the inputs for determining fair value. OREO is reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on the same factors identified above. The Company recovers the carrying value of OREO through the sale of the property. The ability to affect future sales prices is subject to market conditions and factors beyond the Company’s control and may impact the estimated fair value of a property.
	Originated mortgage servicing rights are recorded at their fair value at the time of sale of the underlying loan, and are amortized in proportion to and over the estimated period of net servicing income.  The fair value of mortgage servicing rights is based on a valuation model incorporating inputs that market participants would use in estimating future net servicing income.  Such inputs include estimates of the cost of servicing loans, appropriate discount rate and prepayment speeds and are considered to be unobservable and contribute to the Level 3 classification of mortgage servicing rights.  In accordance with GAAP, the Company must record impairment charges, on a nonrecurring basis, when the carrying value of a stratum exceeds its estimated fair value.  Impairment is recognized through a valuation allowance.  There is no valuation allowance at March 31, 2015 as the fair value of mortgage servicing rights of approximately $1.4 million exceeded the carrying value of approximately $1.1 million.
	The Company evaluates goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment.  The fair value of each reporting unit is compared to the carrying amount of that reporting unit in order to determine if impairment is indicated.  If so, the implied fair value of the reporting unit’s goodwill is compared to its carrying amount and the impairment loss is measured by the excess of the carrying value of the goodwill over fair value of the goodwill.  In such situations, the Company performs a discounted cash flow modeling technique that requires management to make estimates regarding the amount and timing of expected future cash flows of the assets and liabilities of the reporting unit that enable the Company to calculate the implied fair value of the goodwill.  It also requires use of a discount rate that reflects the current return expectation of the market in relation to present risk-free interest rates, expected equity market premiums, peer volatility indicators and company-specific risk indicators.  The Company did not recognize an impairment charge during 2014 or thus far in 2015.
	The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis are as follows:
	(000's omitted)		Fair Value at March 31, 2015			Valuation Technique	Significant Unobservable Inputs		Significant Unobservable Input Range
									(Weighted Average)
	Other real estate owned		$	1,767		Fair Value of Collateral	Estimated cost of disposal/market adjustment			10.0%-49.2% (23.3	%)
	Commitments to originate real estate loans for sale			152		Discounted cash flow	Embedded servicing value			1	%
The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis as of December 31, 2014 are as follows:
(000's omitted)		Fair Value at December 31, 2014			Valuation Technique	Significant Unobservable Inputs		Significant Unobservable Input Range
								(Weighted Average)
Other real estate owned		$	1,855		Fair value of collateral	Estimated cost of disposal/market adjustment			10.0% - 77.5% (30.6	%)
Commitments to originate real estate loans for sale			185		Discounted cash flow	Embedded servicing value			1	%
The Company determines fair values based on quoted market values, where available, estimates of present values, or other valuation techniques.  Those techniques are significantly affected by the assumptions used, including, but not limited to, the discount rate and estimates of future cash flows.  In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, may not be realized in immediate settlement of the instrument.  Certain financial instruments and all nonfinancial instruments are excluded from fair value disclosure requirements.  Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.
The carrying amounts and estimated fair values of the Company’s other financial instruments that are not accounted for at fair value at March 31, 2015 and December 31, 2014 are as follows:
		31-Mar-15								31-Dec-14
		Carrying				Fair				Carrying		Fair
(000's omitted)		Value				Value				Value		Value
Financial assets:
Net loans		$	4,118,906			$	4,167,605			$	4,190,865	$	4,251,565
Financial liabilities:
Deposits			6,126,547				6,126,431				5,935,264		5,935,690
Borrowings			195,700				195,700				338,000		338,000
Subordinated debt held by unconsolidated subsidiary trusts			102,128				86,116				102,122		85,189
The following is a further description of the principal valuation methods used by the Company to estimate the fair values of its financial instruments.
Loans have been classified as a Level 3 valuation.  Fair values for variable rate loans that reprice frequently are based on carrying values.  Fair values for fixed rate loans are estimated using discounted cash flows and interest rates currently being offered for loans with similar terms to borrowers of similar credit quality.
Deposits have been classified as a Level 2 valuation.  The fair value of demand deposits, interest-bearing checking deposits, savings accounts and money market deposits is the amount payable on demand at the reporting date.  The fair value of time deposit obligations are based on current market rates for similar products.
Borrowings have been classified as a Level 2 valuation.  The fair value of FHLB overnight advances is the amount payable on demand at the reporting date.  Fair values for long-term borrowings are estimated using discounted cash flows and interest rates currently being offered on similar borrowings, and are immaterial as of the reporting dates.
Subordinated debt held by unconsolidated subsidiary trusts have been classified as a Level 2 valuation.   The fair value of subordinated debt held by unconsolidated subsidiary trusts are estimated using discounted cash flows and interest rates currently being offered on similar securities.
Other financial assets and liabilities – Cash and cash equivalents have been classified as a Level 1 valuation, while accrued interest receivable and accrued interest payable have been classified as a Level 2 valuation.  The fair values of each approximate the respective carrying values because the instruments are payable on demand or have short-term maturities and present relatively low credit risk and interest rate risk.

DERIVATIVE_INSTRUMENTS

DERIVATIVE INSTRUMENTS	3 Months Ended
	Mar. 31, 2015
DERIVATIVE INSTRUMENTS [Abstract]
DERIVATIVE INSTRUMENTS	NOTE L:  DERIVATIVE INSTRUMENTS
	The Company is party to derivative financial instruments in the normal course of its business to meet the financing needs of its customers and to manage its own exposure to fluctuations in interest rates.  These financial instruments have been limited to commitments to originate real estate loans held for sale and forward sales commitments.  The Company does not hold or issue derivative financial instruments for trading or other speculative purposes.
	The Company enters into forward sales commitments for the future delivery of residential mortgage loans, and interest rate lock commitments to fund loans at a specified interest rate.  The forward sales commitments are utilized to reduce interest rate risk associated with interest rate lock commitments and loans held for sale.  Changes in the estimated fair value of the forward sales commitments and interest rate lock commitments subsequent to inception are based on changes in the fair value of the underlying loan resulting from the fulfillment of the commitment and changes in the probability that the loan will fund within the terms of the commitment, which is affected primarily by changes in interest rates and the passage of time.  At inception and during the life of the interest rate lock commitment, the Company includes the expected net future cash flows related to the associated servicing of the loan as part of the fair value measurement of the interest rate lock commitments.  These derivatives are recorded at fair value.
	The following table presents the Company’s derivative financial instruments, their estimated fair values, and balance sheet location as of March 31, 2015:
	(000's omitted)	Location	Notional			Fair Value
	Derivatives not designated as hedging instruments:
	Forward sales commitments	Other liabilities	$	5,236		$	(22	)
	Commitments to originate real estate loans for sale	Other assets		5,035			152
	Total derivatives , net					$	130
	The following table presents the Company’s derivative financial instruments and the location of the net gain or loss recognized in the statement of income for the three months ended March 31, 2015:
	(000's omitted)	Location	Loss recognized in the Statement of
			Income for the Three Months
			Ending
			31-Mar-15
	Forward sales commitments	Mortgage banking and other services	$	21
	Commitments to originate real estate loans for sale	Mortgage banking and other services		(33	)
	Total, net		$	(12	)

SEGMENT_INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2015
SEGMENT INFORMATION [Abstract]
SEGMENT INFORMATION	NOTE M:  SEGMENT INFORMATION
	Operating segments are components of an enterprise, which are evaluated regularly by the “chief operating decision maker” in deciding how to allocate resources and assess performance.  The Company’s chief operating decision maker is the President and Chief Executive Officer of the Company. The Company has identified Banking, Employee Benefit Services and Wealth Management as its reportable operating business segments.  CBNA operates the banking segment that provides full-service banking to consumers, businesses and governmental units in northern, central and western New York as well as northern Pennsylvania.  Employee benefit services, which includes Benefit Plans Administrative Services, Inc. (“BPAS”) and subsidiaries with offices throughout the U.S. and Puerto Rico, provides employee benefit trust, collective investment fund, retirement plan administration, actuarial, VEBA/HRA and health and welfare consulting services.  Wealth management services activities include trust services provided by the personal trust unit within the Bank, investment and insurance products and services provided by Community Investment Services, Inc. (“CISI”) and CBNA Insurance Agency, Inc., and asset management provided by Nottingham Advisors, Inc.  The accounting policies used in the disclosure of business segments are the same as those described in the summary of significant accounting policies (See Note A, Summary of Significant Accounting Policies of the most recent Form 10-K for the year ended December 31, 2014 filed with the SEC on March 2, 2015).
	Information about reportable segments and reconciliation of the information to the consolidated financial statements follows:
	(000's omitted)	Banking		Employee Benefit Services		Wealth Management		Eliminations			Consolidated Total
	Three Months Ended March 31, 2015
	Net interest income	$	59,785	$	29	$	26	$	0		$	59,840
	Provision for loan losses		623		0		0		0			623
	Noninterest income		13,524		11,353		4,633		(464	)		29,046
	Amortization of intangible assets		739		133		47		0			919
	Other operating expenses		43,819		8,451		3,223		(464	)		55,029
	Income before income taxes	$	28,128	$	2,798	$	1,389	$	0		$	32,315
	Assets	$	7,549,811	$	32,206	$	16,329	$	(22,307	)	$	7,576,039
	Goodwill	$	364,495	$	8,019	$	2,660	$	0		$	375,174
	Three Months Ended March 31, 2014
	Net interest income	$	60,063	$	23	$	22	$	0		$	60,108
	Provision for loan losses		1,000		0		0		0			1,000
	Noninterest income		13,444		10,721		4,663		(474	)		28,354
	Amortization of intangible assets		912		172		57		0			1,141
	Other operating expenses		43,711		8,297		3,246		(474	)		54,780
	Income before income taxes	$	27,884	$	2,275	$	1,382	$	0		$	31,541
	Assets	$	7,370,190	$	30,719	$	14,383	$	(18,064	)	$	7,397,228
	Goodwill	$	364,495	$	8,019	$	2,660	$	0		$	375,174

ACCOUNTING_POLICIES_Policies

ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2015
ACCOUNTING POLICIES [Abstract]
Acquired loans	Acquired loans
	Acquired loans are initially recorded at their acquisition date fair values.  The carryover of allowance for loan losses is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. Fair values for acquired loans are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, prepayment risk, liquidity risk, default rates, loss severity, payment speeds, collateral values and discount rate.
	Acquired impaired loans
	Acquired loans that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments are accounted for as impaired loans under ASC 310-30.  The excess of undiscounted cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized into interest income over the remaining life of the loans using the interest method. The difference between contractually required payments at acquisition and the undiscounted cash flows expected to be collected at acquisition is referred to as the non-accretable discount. The non-accretable discount represents estimated future credit losses and other contractually required payments that the Company does not expect to collect. Subsequent decreases in expected cash flows are recognized as impairments through a charge to the provision for credit losses resulting in an increase in the allowance for loan losses. Subsequent improvements in expected cash flows result in a recovery of previously recorded allowance for loan losses or a reversal of a corresponding amount of the non-accretable discount, which the Company then reclassifies as an accretable discount that is recognized into interest income over the remaining life of the loans using the interest method.
	Acquired loans that met the criteria for non-accrual of interest prior to acquisition may be considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company can reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans. As such, the Company may no longer consider the loan to be non-accrual or non-performing and may accrue interest on these loans, including the impact of any accretable discount.
	Acquired non-impaired loans
	Acquired loans that do not meet the requirements under ASC 310-30 are considered acquired non-impaired loans. The difference between the acquisition date fair value and the outstanding balance represents the fair value adjustment for a loan and includes both credit and interest rate considerations. Fair value adjustments may be discounts (or premiums) to a loan’s cost basis and are accreted (or amortized) to net interest income (or expense) over the loan’s remaining life in accordance with ASC 310- 20. Fair value adjustments for revolving loans are accreted (or amortized) using a straight line method. Term loans are accreted (or amortized) using the constant effective yield method.
	Subsequent to the purchase date, the methods used to estimate the allowance for loan losses for the acquired non-impaired loans is consistent with the policy described below.  However, the Company compares the net realizable value of the loans to the carrying value, for loans collectively evaluated for impairment.  The carrying value represents the net of the loan’s unpaid principal balance and the remaining purchase discount (or premium) that has yet to be accreted into interest income.  When the carrying value exceeds the net realizable value, an allowance for loan losses is recognized.
Allowance for Loan Losses	Allowance for Loan Losses
	Management continually evaluates the credit quality of the Company’s loan portfolio, and performs a formal review of the adequacy of the allowance for loan losses on a quarterly basis.  The allowance reflects management’s best estimate of probable losses inherent in the loan portfolio.  Determination of the allowance is subjective in nature and requires significant estimates.   The Company’s allowance methodology consists of two broad components - general and specific loan loss allocations.
	The general loan loss allocation is composed of two calculations that are computed on five main loan segments:  business lending, consumer installment - direct, consumer installment - indirect, home equity and consumer mortgage.  The first calculation is quantitative and determines an allowance level based on the latest 36 months of historical net charge-off data for each loan class (commercial loans exclude balances with specific loan loss allocations).  The second calculation is qualitative and takes into consideration eight qualitative environmental factors:  levels and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards, and other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations.    A component of the qualitative calculation is the unallocated allowance for loan loss.  The qualitative and quantitative calculations are added together to determine the general loan loss allocation.  The specific loan loss allocation relates to individual commercial loans that are both greater than $0.5 million and in a nonaccruing status with respect to interest.  Specific loan losses are based on discounted estimated cash flows, including any cash flows resulting from the conversion of collateral or collateral shortfalls.  The allowance levels computed from the specific and general loan loss allocation methods are combined with unallocated allowances and allowances needed for acquired loans to derive the total required allowance for loan losses to be reflected on the Consolidated Statement of Condition.
	Loan losses are charged off against the allowance, while recoveries of amounts previously charged off are credited to the allowance.  A provision for loan losses is charged to operations based on management’s periodic evaluation of factors previously mentioned.
Investment Securities	Investment Securities
	The Company has classified its investments in debt and equity securities as held-to-maturity or available-for-sale.  Held-to-maturity securities are those for which the Company has the positive intent and ability to hold until maturity, and are reported at cost, which is adjusted for amortization of premiums and accretion of discounts.  During December 2013, the Company reclassified its held-to-maturity portfolio to available-for-sale and consequently has not used the held-to-maturity classification since.  Securities classified as available-for-sale are reported at fair value with net unrealized gains and losses reflected as a separate component of shareholders' equity, net of applicable income taxes.  None of the Company's investment securities have been classified as trading securities at March 31, 2015.  Certain equity securities are stated at cost and include restricted stock of the Federal Reserve Bank of New York (“Federal Reserve”) and Federal Home Loan Bank of New York (“FHLB”).
	Fair values for investment securities are based upon quoted market prices, where available.  If quoted market prices are not available, fair values are based upon quoted market prices of comparable instruments, or a discounted cash flow model using market estimates of interest rates and volatility.
	The Company conducts an assessment of all securities in an unrealized loss position to determine if other-than-temporary impairment (“OTTI”) exists on a quarterly basis. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis.  The OTTI assessment considers the security structure, recent security collateral performance metrics, if applicable, external credit ratings, failure of the issuer to make scheduled interest or principal payments, judgment about and expectations of future performance, and relevant independent industry research, analysis and forecasts. The severity of the impairment and the length of time the security has been impaired is also considered in the assessment.  The assessment of whether an OTTI decline exists is performed on each security, regardless of the classification of the security as available-for-sale or held-to-maturity and involves a high degree of subjectivity and judgment that is based on the information available to management at a point in time.
	An OTTI loss must be recognized for a debt security in an unrealized loss position if there is intent to sell the security or it is more likely than not the Company will be required to sell the security prior to recovery of its amortized cost basis. In this situation, the amount of loss recognized in income is equal to the difference between the fair value and the amortized cost basis of the security. Even if management does not have the intent, and it is not more likely than not that the Company will be required to sell the securities, an evaluation of the expected cash flows to be received is performed to determine if a credit loss has occurred. For debt securities, a critical component of the evaluation for OTTI is the identification of credit-impaired securities, where the Company does not expect to receive cash flows sufficient to recover the entire amortized cost basis of the security.  In the event of a credit loss, only the amount of impairment associated with the credit loss would be recognized in income. The portion of the unrealized loss relating to other factors, such as liquidity conditions in the market or changes in market interest rates, is recorded in accumulated other comprehensive loss.
	Equity securities are also evaluated to determine whether the unrealized loss is expected to be recoverable based on whether evidence exists to support a realizable value equal to or greater than the amortized cost basis. If it is probable that the amortized cost basis will not be recovered, taking into consideration the estimated recovery period and the ability to hold the equity security until recovery, OTTI is recognized in earnings equal to the difference between the fair value and the amortized cost basis of the security.
	The specific identification method is used in determining the realized gains and losses on sales of investment securities and OTTI charges.  Premiums and discounts on securities are amortized and accreted, respectively, on the interest method basis over the period to maturity or estimated life of the related security.  Purchases and sales of securities are recognized on a trade date basis.
Intangible Assets	Intangible Assets
	Intangible assets include core deposit intangibles, customer relationship intangibles and goodwill arising from acquisitions. Core deposit intangibles and customer relationship intangibles are amortized on either an accelerated or straight-line basis over periods ranging from seven to 20 years. The initial and ongoing carrying value of goodwill and other intangible assets is based upon discounted cash flow modeling techniques that require management to make estimates regarding the amount and timing of expected future cash flows.  It also requires use of a discount rate that reflects the current return requirements of the market in relation to present risk-free interest rates, required equity market premiums, peer volatility indicators, and company-specific risk indicators.
	The Company evaluates goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment.  The implied fair value of a reporting unit’s goodwill is compared to its carrying amount and the impairment loss is measured by the excess of the carrying value over fair value.  The fair value of each reporting unit is compared to the carrying amount of that reporting unit in order to determine if impairment is indicated.
Retirement Benefits	Retirement Benefits
	The Company provides defined benefit pension benefits to eligible employees and post-retirement health and life insurance benefits to certain eligible retirees.  The Company also provides deferred compensation and supplemental executive retirement plans for selected current and former employees, officers, and directors.  Expense under these plans is charged to current operations and consists of several components of net periodic benefit cost based on various actuarial assumptions regarding future experience under the plans, including discount rate, rate of future compensation increases and expected return on plan assets.
New Accounting Pronouncements	New Accounting Pronouncements
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606).  This new guidance supersedes the revenue recognition requirements in ASC 605, Revenue Recognition, and is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects consideration to which the entity expects to be entitled in exchange for those goods and services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  This guidance is effective prospectively for the Company for annual and interim periods beginning after December 15, 2016.  The Company is currently evaluating the effect the guidance will have on the Company’s consolidated financial statements.

ACQUISITIONS_Tables

ACQUISITIONS (Tables)	3 Months Ended
	Mar. 31, 2015
ACQUISITIONS [Abstract]
Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed during 2014:
	(000’s omitted)
	Consideration paid/(received):
	Cash/Total net consideration paid/(received)	$	924
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Other assets/( liabilities), net		163
	Other intangibles		578
	Total identifiable assets/(liabilities), net		741
	Goodwill	$	183

INVESTMENT_SECURITIES_Tables

INVESTMENT SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2015
INVESTMENT SECURITIES [Abstract]
Amortized Cost and Estimated Fair Value of Investment Securities	The amortized cost and estimated fair value of investment securities as of March 31, 2015 and December 31, 2014 are as follows:
		31-Mar-15								31-Dec-14
				Gross		Gross						Gross		Gross
		Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
	(000's omitted)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
	Available-for-Sale Portfolio:
	U.S. Treasury and agency securities	$	1,606,766	$	69,346	$	0	$	1,676,112	$	1,479,134	$	39,509	$	910	$	1,517,733
	Obligations of state and political subdivisions		645,979		27,041		311		672,709		645,398		26,749		244		671,903
	Government agency mortgage-backed securities		220,279		10,016		769		229,526		228,971		9,782		1,025		237,728
	Corporate debt securities		26,770		277		21		27,026		26,803		363		75		27,091
	Government agency collateralized mortgage obligations		16,307		673		0		16,980		17,330		695		0		18,025
	Marketable equity securities		250		178		2		426		250		195		0		445
	Total available-for-sale portfolio	$	2,516,351	$	107,531	$	1,103	$	2,622,779	$	2,397,886	$	77,293	$	2,254	$	2,472,925
	Other Securities:
	Federal Home Loan Bank common stock	$	13,149					$	13,149	$	19,553					$	19,553
	Federal Reserve Bank common stock		16,050						16,050		16,050						16,050
	Other equity securities		4,446						4,446		4,446						4,446
	Total other securities	$	33,645					$	33,645	$	40,049					$	40,049
Summary of Investment Securities That Have Been in a Continuous Unrealized Loss Position for Less Than or Greater Than Twelve Months	A summary of investment securities that have been in a continuous unrealized loss position for less than, or greater than, twelve months is as follows:
	As of March 31, 2015
		Less than 12 Months						12 Months or Longer						Total
						Gross						Gross						Gross
				Fair		Unrealized				Fair		Unrealized				Fair		Unrealized
	(000's omitted)		#	Value		Losses			#	Value		Losses			#	Value		Losses
	Available-for-Sale Portfolio:
	Obligations of state and political subdivisions		31	$	18,327	$	271		3	$	1,209	$	40		34	$	19,536	$	311
	Government agency mortgage-backed securities		2		2		0		19		34,302		769		21		34,304		769
	Corporate debt securities		0		0		0		1		2,792		21		1		2,792		21
	Government agency collateralized mortgage obligations		1		0		0		1		5		0		2		5		0
	Marketable equity securities		1		99		2		0		0		0		1		99		2
	Total available-for-sale/investment portfolio		35	$	18,428	$	273		24	$	38,308	$	830		59	$	56,736	$	1,103
	As of December 31, 2014
		Less than 12 Months						12 Months or Longer						Total
						Gross						Gross						Gross
				Fair		Unrealized				Fair		Unrealized				Fair		Unrealized
	(000's omitted)		#	Value		Losses			#	Value		Losses			#	Value		Losses
	Available-for-Sale Portfolio:
	U.S. Treasury and agency obligations		0	$	0	$	0		4	$	102,363	$	910		4	$	102,363	$	910
	Obligations of state and political subdivisions		23		13,413		34		46		26,490		210		69		39,903		244
	Government agency mortgage-backed securities		3		5		0		19		34,770		1,025		22		34,775		1,025
	Corporate debt securities		1		3,040		1		1		2,755		74		2		5,795		75
	Government agency collateralized mortgage obligations		1		0		0		1		5		0		2		5		0
	Total available-for-sale/investment portfolio		28	$	16,458	$	35		71	$	166,383	$	2,219		99	$	182,841	$	2,254
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	The amortized cost and estimated fair value of debt securities at March 31, 2015, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Securities not due at a single maturity date are shown separately.
		Available-for-Sale
		Amortized		Fair
	(000's omitted)	Cost		Value
	Due in one year or less	$	40,781	$	41,170
	Due after one through five years		163,322		167,984
	Due after five years through ten years		1,834,409		1,914,623
	Due after ten years		241,003		252,070
	Subtotal		2,279,515		2,375,847
	Government agency mortgage-backed securities		220,279		229,526
	Government agency collateralized mortgage obligations		16,307		16,980
	Total	$	2,516,101	$	2,622,353

LOANS_Tables

LOANS (Tables)	3 Months Ended
	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Loans Receivable, Net	The balances of these classes are summarized as follows:
			March 31,			December 31,
	(000's omitted)		2015			2014
	Consumer mortgage		$	1,605,019		$	1,613,384
	Business lending			1,239,529			1,262,484
	Consumer indirect			804,300			833,968
	Consumer direct			176,084			184,028
	Home equity			338,979			342,342
	Gross loans, including deferred origination costs			4,163,911			4,236,206
	Allowance for loan losses			(45,005	)		(45,341	)
	Loans, net of allowance for loan losses		$	4,118,906		$	4,190,865
Schedule of Accretable Discount Related to Credit Impaired Acquired Loans	The outstanding balance related to credit impaired acquired loans was $5.9 million and $6.1 million at March 31, 2015 and December 31, 2014, respectively.  The changes in the accretable discount related to the credit impaired acquired loans are as follows:
	(000’s omitted)
	Balance at December 31, 2014		$	705
	Accretion recognized, year-to-date			(151	)
	Net reclassification to accretable from nonaccretable			28
	Balance at March 31, 2015		$	582
Aged Analysis of the Company's Past Due Loans by Class	The following is an aged analysis of the Company’s past due loans, by class as of March 31, 2015:
	Legacy Loans (excludes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Current			Total Loans
	Consumer mortgage		$	9,841		$	1,105		$	13,467		$	24,413		$	1,514,128		$	1,538,541
	Business lending			4,779			90			2,731			7,600			1,099,128			1,106,728
	Consumer indirect			6,419			51			0			6,470			796,892			803,362
	Consumer direct			863			29			2			894			170,276			171,170
	Home equity			1,642			50			2,078			3,770			277,685			281,455
	Total		$	23,544		$	1,325		$	18,278		$	43,147		$	3,858,109		$	3,901,256
	Acquired Loans (includes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total			Acquired
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Impaired(1)			Current		Total Loans
	Consumer mortgage		$	1,671		$	210		$	1,974		$	3,855		$	0		$	62,623	$	66,478
	Business lending			939			0			300			1,239			5,280			126,282		132,801
	Consumer indirect			29			0			0			29			0			909		938
	Consumer direct			80			0			18			98			0			4,816		4,914
	Home equity			401			164			414			979			0			56,545		57,524
	Total		$	3,120		$	374		$	2,706		$	6,200		$	5,280		$	251,175	$	262,655
	-1	Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30.  As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.
	The following is an aged analysis of the Company’s past due loans by class as of December 31, 2014:
	Legacy Loans (excludes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Current			Total Loans
	Consumer mortgage		$	13,978		$	2,165		$	13,201		$	29,344		$	1,515,057		$	1,544,401
	Business lending			6,738			350			2,291			9,379			1,115,215			1,124,594
	Consumer indirect			10,529			82			10			10,621			822,124			832,745
	Consumer direct			1,389			36			2			1,427			177,158			178,585
	Home equity			1,802			195			2,172			4,169			278,904			283,073
	Total		$	34,436		$	2,828		$	17,676		$	54,940		$	3,908,458		$	3,963,398
	Acquired Loans (includes loans acquired after January 1, 2009)
			Past Due			90+ Days Past
			30 – 89			Due and						Total			Acquired
	(000’s omitted)		Days			Still Accruing			Nonaccrual			Past Due			Impaired(1)			Current		Total Loans
	Consumer mortgage		$	1,892		$	232		$	2,122		$	4,246		$	0		$	64,737	$	68,983
	Business lending			608			0			489			1,097			5,312			131,481		137,890
	Consumer indirect			40			0			0			40			0			1,183		1,223
	Consumer direct			174			0			18			192			0			5,251		5,443
	Home equity			674			46			426			1,146			0			58,123		59,269
	Total		$	3,388		$	278		$	3,055		$	6,721		$	5,312		$	260,775	$	272,808
	-1	Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30.  As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.
Summary of Non-business Impaired Loans	All loan classes are collectively evaluated for impairment except business lending, as described in Note C.  A summary of individually evaluated impaired loans as of March 31, 2015 and December 31, 2014 follows:
			March 31,			December 31,
	(000’s omitted)		2015			2014
	Loans with allowance allocation		$	0		$	0
	Loans without allowance allocation			645			0
	Carrying balance			645			0
	Contractual balance			645			0
	Specifically allocated allowance			0			0
Troubled Debt Restructurings on Financing Receivables	Information regarding TDRs as of March 31, 2015 and December 31, 2014 is as follows:
			31-Mar-15																	31-Dec-14
	(000’s omitted)		Nonaccrual						Accruing						Total					Nonaccrual						Accruing				Total
				#		Amount				#		Amount				#		Amount			#		Amount				#	Amount			#	Amount
	Consumer mortgage			49		$	2,059			36		$	1,641			85		$	3,700		49		$	2,092			37	$	1,770		86	$	3,862
	Business lending			4			307			3			463			7			770		6			442			3		468		9		910
	Consumer indirect			0			0			75			649			75			649		0			0			79		615		79		615
	Consumer direct			0			0			22			62			22			62		0			0			25		69		25		69
	Home equity			13			127			13			271			26			398		13			218			13		278		26		496
	Total			66		$	2,493			149		$	3,086			215		$	5,579		68		$	2,752			157	$	3,200		225	$	5,952
	The following table presents information related to loans modified in a TDR during the three months ended March 31, 2015 and 2014.  Of the loans noted in the table below, all loans for the three months ended March 31, 2015 and 2014 were modified due to a Chapter 7 bankruptcy as described previously.  The financial effects of these restructurings were immaterial.
			Three Month Ended March 31, 2015						Three Month Ended March 31, 2014
	(000’s omitted)		Number of loans modified			Outstanding Balance			Number of loans modified			Outstanding Balance
	Consumer mortgage			4		$	213			11		$	533
	Business lending			0			0			4			192
	Consumer indirect			7			101			12			112
	Consumer direct			1			4			2			10
	Home equity			1			15			1			30
	Total			13		$	333			30		$	877
Schedule of Allowance for Loan Losses by Class	The allowance for loan losses is general in nature and is available to absorb losses from any loan type despite the analysis below.  The following presents by class the activity in the allowance for loan losses:
			Three Months Ended March 31, 2015
			Consumer			Business			Consumer			Consumer			Home					Acquired
	(000’s omitted)		Mortgage			Lending			Indirect			Direct			Equity			Unallocated		Impaired			Total
	Beginning balance		$	10,286		$	15,787		$	11,544		$	3,083		$	2,701		$	1,767	$	173		$	45,341
	Charge-offs			(443	)		(133	)		(1,427	)		(345	)		(66	)		0		0			(2,414	)
	Recoveries			21			82			1,152			193			7			0		0			1,455
	Provision			369			(331	)		(23	)		(52	)		21			616		23			623
	Ending balance		$	10,233		$	15,405		$	11,246		$	2,879		$	2,663		$	2,383	$	196		$	45,005
			Three Months Ended March 31, 2014
			Consumer			Business			Consumer			Consumer			Home					Acquired
	(000’s omitted)		Mortgage			Lending			Indirect			Direct			Equity			Unallocated		Impaired			Total
	Beginning balance		$	8,994		$	17,507		$	10,248		$	3,181		$	1,830		$	2,029	$	530		$	44,319
	Charge-offs			(167	)		(120	)		(1,427	)		(492	)		(129	)		0		(13	)		(2,348	)
	Recoveries			41			171			796			212			6			0		0			1,226
	Provision			413			(512	)		969			186			111			149		(316	)		1,000
	Ending balance		$	9,281		$	17,046		$	10,586		$	3,087		$	1,818		$	2,178	$	201		$	44,197
Business Lending [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Loans by Credit Quality Indicator	The following table shows the amount of business lending loans by credit quality category:
			31-Mar-15									31-Dec-14
	(000’s omitted)		Legacy			Acquired			Total			Legacy			Acquired			Total
	Pass		$	936,556		$	90,340		$	1,026,896		$	949,960		$	93,510		$	1,043,470
	Special mention			100,507			16,785			117,292			103,176			18,038			121,214
	Classified			69,665			20,396			90,061			71,458			21,030			92,488
	Doubtful			0			0			0			0			0			0
	Acquired impaired			0			5,280			5,280			0			5,312			5,312
	Total		$	1,106,728		$	132,801		$	1,239,529		$	1,124,594		$	137,890		$	1,262,484
All Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Loans by Credit Quality Indicator	The following table details the balances in all other loan categories at March 31, 2015:
	Legacy loans (excludes loans acquired after January 1, 2009)
			Consumer			Consumer			Consumer			Home
	(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
	Performing		$	1,523,969		$	803,311		$	171,139		$	279,327		$	2,777,746
	Nonperforming			14,572			51			31			2,128			16,782
	Total		$	1,538,541		$	803,362		$	171,170		$	281,455		$	2,794,528
	Acquired loans (includes loans acquired after January 1, 2009)
			Consumer			Consumer			Consumer			Home
	(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
	Performing		$	64,294		$	938		$	4,896		$	56,946		$	127,074
	Nonperforming			2,184			0			18			578			2,780
	Total		$	66,478		$	938		$	4,914		$	57,524		$	129,854
	The following table details the balances in all other loan categories at December 31, 2014:
	Legacy loans (excludes loans acquired after January 1, 2009)
			Consumer			Consumer			Consumer			Home
	(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
	Performing		$	1,529,035		$	832,653		$	178,547		$	280,706		$	2,820,941
	Nonperforming			15,366			92			38			2,367			17,863
	Total		$	1,544,401		$	832,745		$	178,585		$	283,073		$	2,838,804
	Acquired loans (includes loans acquired after January 1, 2009)
			Consumer			Consumer			Consumer			Home
	(000’s omitted)		Mortgage			Indirect			Direct			Equity			Total
	Performing		$	66,629		$	1,223		$	5,425		$	58,797		$	132,074
	Nonperforming			2,354			0			18			472			2,844
	Total		$	68,983		$	1,223		$	5,443		$	59,269		$	134,918

GOODWILL_AND_IDENTIFIABLE_INTA1

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2015
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS [Abstract]
Gross Carrying Amount and Accumulated Amortization of Identifiable Intangible Assets	The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows:
		31-Mar-15									31-Dec-14
		Gross						Net			Gross					Net
		Carrying			Accumulated			Carrying			Carrying		Accumulated			Carrying
	(000's omitted)	Amount			Amortization			Amount			Amount		Amortization			Amount
	Amortizing intangible assets:
	Core deposit intangibles	$	40,326		$	(31,042	)	$	9,284		$	40,326	$	(30,303	)	$	10,023
	Other intangibles		10,019			(8,423	)		1,596			10,019		(8,243	)		1,776
	Total amortizing intangibles	$	50,345		$	(39,465	)	$	10,880		$	50,345	$	(38,546	)	$	11,799
Estimated Aggregate Amortization Expense	The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows:
	Apr - Dec 2015	$	2,489
	2016		2,612
	2017		1,908
	2018		1,424
	2019		1,002
	Thereafter		1,445
	Total	$	10,880
Components of Goodwill	Shown below are the components of the Company’s goodwill at December 31, 2014 and March 31, 2015:
	(000’s omitted)	31-Dec-14			Activity			31-Mar-15
	Goodwill	$	379,998		$	0		$	379,998
	Accumulated impairment		(4,824	)		0			(4,824	)
	Goodwill, net	$	375,174		$	0		$	375,174

MANDATORILY_REDEEMABLE_PREFERR1

MANDATORILY REDEEMABLE PREFERRED SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2015
MANDATORILY REDEEMABLE PREFERRED SECURITIES [Abstract]
Terms of Preferred Securities for Each Trust	The terms of the preferred securities of each trust are as follows:
		Issuance	Par			Maturity
	Trust	Date	Amount		Interest Rate	Date	Call Price
	III	7/31/01	$	24.5 million	3 month LIBOR plus 3.58% (3.83%)	7/31/31	Par
	IV	12/8/06	$	75 million	3 month LIBOR plus 1.65% (1.92%)	12/15/36	Par

BENEFIT_PLANS_Tables

BENEFIT PLANS (Tables)	3 Months Ended
	Mar. 31, 2015
BENEFIT PLANS [Abstract]
Net Periodic Benefit Cost	The net periodic benefit cost for the three months ended March 31, 2015 and 2014 is as follows:
		Pension Benefits						Post-retirement Benefits
		Three Months Ended						Three Months Ended
		March 31,						March 31,
	(000's omitted)	2015			2014			2015			2014
	Service cost	$	831		$	882		$	0		$	0
	Interest cost		1,375			1,318			22			27
	Expected return on plan assets		(3,042	)		(2,980	)		0			0
	Amortization of unrecognized net loss		366			(77	)		(3	)		0
	Amortization of prior service cost		2			1			(45	)		(45	)
	Net periodic benefit cost	$	(468	)	$	(856	)	$	(26	)	$	(18	)

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2015
EARNINGS PER SHARE [Abstract]
Reconciliation of Basic to Diluted Earnings per Share	The following is a reconciliation of basic to diluted earnings per share for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31,
	(000's omitted, except per share data)	2015			2014
	Net income	$	22,297		$	22,173
	Income attributable to unvested stock-based compensation awards		(100	)		(99	)
	Income available to common shareholders		22,197		$	22,074
	Weighted-average common shares outstanding – basic		40,659			40,458
	Basic earnings per share	$	0.55		$	0.55
	Net income	$	22,297		$	22,173
	Income attributable to unvested stock-based compensation awards		(100	)		(99	)
	Income available to common shareholders		22,197		$	22,074
	Weighted-average common shares outstanding – basic		40,659			40,458
	Assumed exercise of stock options		405			512
	Weighted-average common shares outstanding – diluted		41,064			40,970
	Diluted earnings per share	$	0.54		$	0.54

COMMITMENTS_CONTINGENT_LIABILI1

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Tables)	3 Months Ended
	Mar. 31, 2015
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS [Abstract]
Off-Balance-Sheet Financial Instruments Contract Amount	The contract amount of commitments and contingencies are as follows:
	(000's omitted)	March 31,		December 31,
		2015		2014
	Commitments to extend credit	$	786,327	$	733,827
	Standby letters of credit		22,788		23,916
	Total	$	809,115	$	757,743

FAIR_VALUE_Tables

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2015
FAIR VALUE [Abstract]
Summary of Fair Value Measured on a Recurring Basis	The following tables set forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis.  There were no transfers between any of the levels for the periods presented.
			31-Mar-15
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value
	Available-for-sale investment securities:
	U.S. Treasury and agency securities		$	1,676,112			$	0			$	0	$	1,676,112
	Obligations of state and political subdivisions			0				672,709				0		672,709
	Government agency mortgage-backed securities			0				229,526				0		229,526
	Corporate debt securities			0				27,026				0		27,026
	Government agency collateralized mortgage obligations			0				16,980				0		16,980
	Marketable equity securities			426				0				0		426
	Total available-for-sale investment securities			1,676,538				946,241				0		2,622,779
	Mortgage loans held for sale			0				1,437				0		1,437
	Commitments to originate real estate loans for sale			0				0				152		152
	Forward sales commitments			0				(22	)			0		(22	)
	Total		$	1,676,538			$	947,656			$	152	$	2,624,346
			31-Dec-14
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value
	Available-for-sale investment securities:
	U.S. Treasury and agency securities		$	1,496,667			$	21,066			$	0	$	1,517,733
	Obligations of state and political subdivisions			0				671,903				0		671,903
	Government agency mortgage-backed securities			0				237,728				0		237,728
	Corporate debt securities			0				27,091				0		27,091
	Government agency collateralized mortgage obligations			0				18,025				0		18,025
	Marketable equity securities			445				0				0		445
	Total available-for-sale investment securities			1,497,112				975,813				0		2,472,925
	Mortgage loans held for sale			0				1,042				0		1,042
	Commitments to originate real estate loans for sale			0				0				185		185
	Forward sales commitments			0				(43	)			0		(43	)
	Total		$	1,497,112			$	976,812			$	185	$	2,474,109
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis are summarized in the following tables:
			Three Months Ended
			March 31,
			2015				2014
	(000's omitted)		Commitments to Originate Real				Commitments to Originate Real
			Estate Loans for Sale				Estate Loans for Sale
	Beginning balance		$	185			$	44
	Total (losses)/gains included in earnings (1)			(185	)			(44	)
	Commitments to originate real estate loans held for sale, net			152				67
	Ending balance		$	152			$	67
	-1	Amounts included in earnings associated with the commitments to originate real estate loans for sale are reported as a component of other banking services in the Consolidated Statement of Income.
Assets and Liabilities Measured on a Non-Recurring Basis	Assets and liabilities measured on a non-recurring basis:
			31-Mar-15													31-Dec-14
	(000's omitted)		Level 1				Level 2				Level 3		Total Fair Value			Level 1		Level 2		Level 3		Total Fair Value
	Other real estate owned		$	0			$	0			$	1,767	$	1,767		$	0	$	0	$	1,855	$	1,855
Significant Unobservable Inputs, Fair Value Valuation Techniques	The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis are as follows:
	(000's omitted)		Fair Value at March 31, 2015			Valuation Technique	Significant Unobservable Inputs		Significant Unobservable Input Range
									(Weighted Average)
	Other real estate owned		$	1,767		Fair Value of Collateral	Estimated cost of disposal/market adjustment			10.0%-49.2% (23.3	%)
	Commitments to originate real estate loans for sale			152		Discounted cash flow	Embedded servicing value			1	%
	The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis as of December 31, 2014 are as follows:
	(000's omitted)		Fair Value at December 31, 2014			Valuation Technique	Significant Unobservable Inputs		Significant Unobservable Input Range
									(Weighted Average)
	Other real estate owned		$	1,855		Fair value of collateral	Estimated cost of disposal/market adjustment			10.0% - 77.5% (30.6	%)
	Commitments to originate real estate loans for sale			185		Discounted cash flow	Embedded servicing value			1	%
Carrying Amounts and Estimated Fair Values of Other Financial Instruments	The carrying amounts and estimated fair values of the Company’s other financial instruments that are not accounted for at fair value at March 31, 2015 and December 31, 2014 are as follows:
			31-Mar-15								31-Dec-14
			Carrying				Fair				Carrying		Fair
	(000's omitted)		Value				Value				Value		Value
	Financial assets:
	Net loans		$	4,118,906			$	4,167,605			$	4,190,865	$	4,251,565
	Financial liabilities:
	Deposits			6,126,547				6,126,431				5,935,264		5,935,690
	Borrowings			195,700				195,700				338,000		338,000
	Subordinated debt held by unconsolidated subsidiary trusts			102,128				86,116				102,122		85,189

DERIVATIVE_INSTRUMENTS_Tables

DERIVATIVE INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2015
DERIVATIVE INSTRUMENTS [Abstract]
Derivative Instruments Fair Value and Balance Sheet Location	The following table presents the Company’s derivative financial instruments, their estimated fair values, and balance sheet location as of March 31, 2015:
	(000's omitted)	Location	Notional			Fair Value
	Derivatives not designated as hedging instruments:
	Forward sales commitments	Other liabilities	$	5,236		$	(22	)
	Commitments to originate real estate loans for sale	Other assets		5,035			152
	Total derivatives , net					$	130
Derivative Instruments and Location of Net Gain or Loss In Statement of Income	The following table presents the Company’s derivative financial instruments and the location of the net gain or loss recognized in the statement of income for the three months ended March 31, 2015:
	(000's omitted)	Location	Loss recognized in the Statement of
			Income for the Three Months
			Ending
			31-Mar-15
	Forward sales commitments	Mortgage banking and other services	$	21
	Commitments to originate real estate loans for sale	Mortgage banking and other services		(33	)
	Total, net		$	(12	)

SEGMENT_INFORMATION_Tables

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2015
SEGMENT INFORMATION [Abstract]
Schedule of Segment Reporting Information by Segment	Information about reportable segments and reconciliation of the information to the consolidated financial statements follows:
	(000's omitted)	Banking		Employee Benefit Services		Wealth Management		Eliminations			Consolidated Total
	Three Months Ended March 31, 2015
	Net interest income	$	59,785	$	29	$	26	$	0		$	59,840
	Provision for loan losses		623		0		0		0			623
	Noninterest income		13,524		11,353		4,633		(464	)		29,046
	Amortization of intangible assets		739		133		47		0			919
	Other operating expenses		43,819		8,451		3,223		(464	)		55,029
	Income before income taxes	$	28,128	$	2,798	$	1,389	$	0		$	32,315
	Assets	$	7,549,811	$	32,206	$	16,329	$	(22,307	)	$	7,576,039
	Goodwill	$	364,495	$	8,019	$	2,660	$	0		$	375,174
	Three Months Ended March 31, 2014
	Net interest income	$	60,063	$	23	$	22	$	0		$	60,108
	Provision for loan losses		1,000		0		0		0			1,000
	Noninterest income		13,444		10,721		4,663		(474	)		28,354
	Amortization of intangible assets		912		172		57		0			1,141
	Other operating expenses		43,711		8,297		3,246		(474	)		54,780
	Income before income taxes	$	27,884	$	2,275	$	1,382	$	0		$	31,541
	Assets	$	7,370,190	$	30,719	$	14,383	$	(18,064	)	$	7,397,228
	Goodwill	$	364,495	$	8,019	$	2,660	$	0		$	375,174

ACQUISITIONS_Details

ACQUISITIONS (Details) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Feb. 24, 2015
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract]
Goodwill	$375,174,000	$375,174,000	$375,174,000
Merger and acquisition integration-related expenses	400,000	100,000
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of core deposit intangible and other intangible	8 years
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of core deposit intangible and other intangible	8 years
EBS-RMSCO, Inc. [Member]
Consideration paid/(received) [Abstract]
Cash/Total net consideration paid/(received)			924,000
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract]
Other assets/( liabilities), net			163,000
Other intangibles			578,000
Total identifiable assets/(liabilities), net			741,000
Goodwill			183,000
Oneida Financial Corp [Member]
Consideration paid/(received) [Abstract]
Cash/Total net consideration paid/(received)				142,000,000
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract]
Number of new branch locations included in acquisition or purchase agreement				12
Assets acquired				800,000,000
Loans acquired				370,000,000
Deposits acquired				$690,000,000

ACCOUNTING_POLICIES_Details

ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
	Factor
	Segment
	Component
	Calculation
Allowance for Loan Losses [Abstract]
Number of broad components used in allowance methodology	2
Number of calculations used for general loan loss allocation	2
Number of main loan segments	5
Period of historical net charge-off data for each loan class used in determining allowance level	36 months
Number of qualitative environmental factors used in qualitative calculation for loan loss allocation	8
Threshold amount for specific loan losses of individual commercial loans	$0.50
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life (amortization period)	8 years
Core Deposits [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life (amortization period)	7 years
Core Deposits [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life (amortization period)	20 years
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life (amortization period)	7 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life (amortization period)	20 years

INVESTMENT_SECURITIES_Details

INVESTMENT SECURITIES (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Position	Position
Available-for-Sale Portfolio [Abstract]
Amortized Cost	$2,516,351	$2,397,886
Gross Unrealized Gains	107,531	77,293
Gross Unrealized Losses	1,103	2,254
Fair Value	2,622,779	2,472,925
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Fair Value	2,622,353
Other Securities [Abstract]
Amortized Cost	33,645	40,049
Fair Value	33,645	40,049
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	35	28
12 months or longer	24	71
Total	59	99
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	18,428	16,458
12 months or longer	38,308	166,383
Total	56,736	182,841
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	273	35
12 months or longer	830	2,219
Total	1,103	2,254
Available-for-Sale, Debt Maturities, Amortized Cost [Abstract]
Due in one year or less	40,781
Due in one to five years	163,322
Due in five through ten years	1,834,409
Due after ten years	241,003
Subtotal	2,279,515
Amortized cost	2,516,101
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Due in one year or less	41,170
Due in one to five years	167,984
Due in five through ten years	1,914,623
Due after ten years	252,070
Subtotal	2,375,847
Fair value	2,622,353
U.S. Treasury and Agency Obligations [Member]
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Amortized Cost	1,606,766	1,479,134
Gross Unrealized Gains	69,346	39,509
Gross Unrealized Losses	0	910
Fair Value	1,676,112	1,517,733
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months		0
12 months or longer		4
Total		4
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months		0
12 months or longer		102,363
Total		102,363
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months		0
12 months or longer		910
Total		910
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Fair value	1,676,112	1,517,733
Obligations of State and Political Subdivisions [Member]
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Amortized Cost	645,979	645,398
Gross Unrealized Gains	27,041	26,749
Gross Unrealized Losses	311	244
Fair Value	672,709	671,903
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	31	23
12 months or longer	3	46
Total	34	69
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	18,327	13,413
12 months or longer	1,209	26,490
Total	19,536	39,903
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	271	34
12 months or longer	40	210
Total	311	244
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Fair value	672,709	671,903
Government Agency Mortgage-Backed Securities [Member]
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Amortized Cost	220,279	228,971
Gross Unrealized Gains	10,016	9,782
Gross Unrealized Losses	769	1,025
Fair Value	229,526	237,728
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	2	3
12 months or longer	19	19
Total	21	22
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	2	5
12 months or longer	34,302	34,770
Total	34,304	34,775
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	769	1,025
Total	769	1,025
Available-for-Sale, Debt Maturities, Amortized Cost [Abstract]
Without single maturity date	220,279
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Without single maturity date	229,526
Fair value	229,526	237,728
Corporate Debt Securities [Member]
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Amortized Cost	26,770	26,803
Gross Unrealized Gains	277	363
Gross Unrealized Losses	21	75
Fair Value	27,026	27,091
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	0	1
12 months or longer	1	1
Total	1	2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	0	3,040
12 months or longer	2,792	2,755
Total	2,792	5,795
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	0	1
12 months or longer	21	74
Total	21	75
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Fair value	27,026	27,091
Government Agency Collateralized Mortgage Obligations [Member]
Available For Sale Debt Securities Amortized Cost Basis [Abstract]
Amortized Cost	16,307	17,330
Gross Unrealized Gains	673	695
Gross Unrealized Losses	0	0
Fair Value	16,980	18,025
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	1	1
12 months or longer	1	1
Total	2	2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	0	0
12 months or longer	5	5
Total	5	5
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
Available-for-Sale, Debt Maturities, Amortized Cost [Abstract]
Without single maturity date	16,307
Available-for-Sale, Debt Maturities, Fair Value [Abstract]
Without single maturity date	16,980
Fair value	16,980	18,025
Marketable Equity Securities [Member]
Available For Sale Equity Securities Amortized Cost Basis [Abstract]
Amortized Cost	250	250
Gross Unrealized Gains	178	195
Gross Unrealized Losses	2	0
Fair Value	426	445
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months	1
12 months or longer	0
Total	1
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]
Less than 12 months	99
12 months or longer	0
Total	99
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]
Less than 12 months	2
12 months or longer	0
Total	2
Federal Home Loan Bank Common Stock [Member]
Other Securities [Abstract]
Amortized Cost	13,149	19,553
Fair Value	13,149	19,553
Federal Reserve Bank Common Stock [Member]
Other Securities [Abstract]
Amortized Cost	16,050	16,050
Fair Value	16,050	16,050
Other Equity Securities [Member]
Other Securities [Abstract]
Amortized Cost	4,446	4,446
Fair Value	$4,446	$4,446

LOANS_Loan_Summary_Details

LOANS, Loan Summary (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Loans receivable, net [Abstract]
Typical contract term of consumer mortgages, minimum	10 years
Typical contract term of consumer mortgages, maximum	30 years
Typical contract term of home equity loans, maximum	30 years
Gross loans, including deferred origination costs	$4,163,911,000	$4,236,206,000
Allowance for loan losses	-45,005,000	-45,341,000	-44,197,000	-44,319,000
Net loans	4,118,906,000	4,190,865,000
Credit impaired acquired loans, outstanding balance	5,900,000	6,100,000
Accretable discount related to credit impaired acquired loans [Roll forward]
Beginning Balance	705,000
Accretion recognized, year-to-date	-151,000
Net reclassification to accretable from nonaccretable	28,000
Ending Balance	582,000
Consumer Mortgage [Member]
Loans receivable, net [Abstract]
Gross loans, including deferred origination costs	1,605,019,000	1,613,384,000
Allowance for loan losses	-10,233,000	-10,286,000	-9,281,000	-8,994,000
Business Lending [Member]
Loans receivable, net [Abstract]
Gross loans, including deferred origination costs	1,239,529,000	1,262,484,000
Allowance for loan losses	-15,405,000	-15,787,000	-17,046,000	-17,507,000
Consumer Indirect [Member]
Loans receivable, net [Abstract]
Gross loans, including deferred origination costs	804,300,000	833,968,000
Allowance for loan losses	-11,246,000	-11,544,000	-10,586,000	-10,248,000
Consumer Direct [Member]
Loans receivable, net [Abstract]
Gross loans, including deferred origination costs	176,084,000	184,028,000
Allowance for loan losses	-2,879,000	-3,083,000	-3,087,000	-3,181,000
Home Equity [Member]
Loans receivable, net [Abstract]
Gross loans, including deferred origination costs	338,979,000	342,342,000
Allowance for loan losses	($2,663,000)	($2,701,000)	($1,818,000)	($1,830,000)

LOANS_Credit_Quality_By_Past_D

LOANS, Credit Quality By Past Due Status (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Aged analysis of the company's loans [Abstract]
Total Loans	$4,163,911		$4,236,206
Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	23,544		34,436
90 + Days Past Due and Still Accruing	1,325		2,828
Nonaccrual	18,278		17,676
Total Past Due	43,147		54,940
Current	3,858,109		3,908,458
Total Loans	3,901,256		3,963,398
Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	3,120		3,388
90 + Days Past Due and Still Accruing	374		278
Nonaccrual	2,706		3,055
Total Past Due	6,200		6,721
Acquired Impaired	5,280	[1]	5,312	[1]
Current	251,175		260,775
Total Loans	262,655		272,808
Consumer Mortgage [Member]
Aged analysis of the company's loans [Abstract]
Total Loans	1,605,019		1,613,384
Consumer Mortgage [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	9,841		13,978
90 + Days Past Due and Still Accruing	1,105		2,165
Nonaccrual	13,467		13,201
Total Past Due	24,413		29,344
Current	1,514,128		1,515,057
Total Loans	1,538,541		1,544,401
Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	1,671		1,892
90 + Days Past Due and Still Accruing	210		232
Nonaccrual	1,974		2,122
Total Past Due	3,855		4,246
Acquired Impaired	0	[1]	0	[1]
Current	62,623		64,737
Total Loans	66,478		68,983
Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total Loans	1,239,529		1,262,484
Business Lending [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	4,779		6,738
90 + Days Past Due and Still Accruing	90		350
Nonaccrual	2,731		2,291
Total Past Due	7,600		9,379
Current	1,099,128		1,115,215
Total Loans	1,106,728		1,124,594
Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	939		608
90 + Days Past Due and Still Accruing	0		0
Nonaccrual	300		489
Total Past Due	1,239		1,097
Acquired Impaired	5,280	[1]	5,312	[1]
Current	126,282		131,481
Total Loans	132,801		137,890
Consumer Indirect [Member]
Aged analysis of the company's loans [Abstract]
Total Loans	804,300		833,968
Consumer Indirect [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	6,419		10,529
90 + Days Past Due and Still Accruing	51		82
Nonaccrual	0		10
Total Past Due	6,470		10,621
Current	796,892		822,124
Total Loans	803,362		832,745
Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	29		40
90 + Days Past Due and Still Accruing	0		0
Nonaccrual	0		0
Total Past Due	29		40
Acquired Impaired	0	[1]	0	[1]
Current	909		1,183
Total Loans	938		1,223
Consumer Direct [Member]
Aged analysis of the company's loans [Abstract]
Total Loans	176,084		184,028
Consumer Direct [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	863		1,389
90 + Days Past Due and Still Accruing	29		36
Nonaccrual	2		2
Total Past Due	894		1,427
Current	170,276		177,158
Total Loans	171,170		178,585
Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	80		174
90 + Days Past Due and Still Accruing	0		0
Nonaccrual	18		18
Total Past Due	98		192
Acquired Impaired	0	[1]	0	[1]
Current	4,816		5,251
Total Loans	4,914		5,443
Home Equity [Member]
Aged analysis of the company's loans [Abstract]
Total Loans	338,979		342,342
Home Equity [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	1,642		1,802
90 + Days Past Due and Still Accruing	50		195
Nonaccrual	2,078		2,172
Total Past Due	3,770		4,169
Current	277,685		278,904
Total Loans	281,455		283,073
Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Past Due 30 - 89 Days	401		674
90 + Days Past Due and Still Accruing	164		46
Nonaccrual	414		426
Total Past Due	979		1,146
Acquired Impaired	0	[1]	0	[1]
Current	56,545		58,123
Total Loans	$57,524		$59,269
[1]	Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.

LOANS_Amount_of_Business_Lendi

LOANS, Amount of Business Lending Loans by Credit Quality Category (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loans	$4,163,911	$4,236,206
Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,901,256	3,963,398
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	262,655	272,808
Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,239,529	1,262,484
Business Lending [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,106,728	1,124,594
Business Lending [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	132,801	137,890
Business Lending [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,026,896	1,043,470
Business Lending [Member] | Pass [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	936,556	949,960
Business Lending [Member] | Pass [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	90,340	93,510
Business Lending [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	117,292	121,214
Business Lending [Member] | Special Mention [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	100,507	103,176
Business Lending [Member] | Special Mention [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	16,785	18,038
Business Lending [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	90,061	92,488
Business Lending [Member] | Classified [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	69,665	71,458
Business Lending [Member] | Classified [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,396	21,030
Business Lending [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Business Lending [Member] | Doubtful [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Business Lending [Member] | Doubtful [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Business Lending [Member] | Acquired Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,280	5,312
Business Lending [Member] | Acquired Impaired [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Business Lending [Member] | Acquired Impaired [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,280	5,312
All Other Loans [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,794,528	2,838,804
All Other Loans [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	129,854	134,918
All Other Loans [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,777,746	2,820,941
All Other Loans [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	127,074	132,074
All Other Loans [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	16,782	17,863
All Other Loans [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,780	2,844
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,605,019	1,613,384
Consumer Mortgage [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,538,541	1,544,401
Consumer Mortgage [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	66,478	68,983
Consumer Mortgage [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,523,969	1,529,035
Consumer Mortgage [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	64,294	66,629
Consumer Mortgage [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,572	15,366
Consumer Mortgage [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,184	2,354
Consumer Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	804,300	833,968
Consumer Indirect [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	803,362	832,745
Consumer Indirect [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	938	1,223
Consumer Indirect [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	803,311	832,653
Consumer Indirect [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	938	1,223
Consumer Indirect [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	51	92
Consumer Indirect [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	176,084	184,028
Consumer Direct [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	171,170	178,585
Consumer Direct [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,914	5,443
Consumer Direct [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	171,139	178,547
Consumer Direct [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,896	5,425
Consumer Direct [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	31	38
Consumer Direct [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	18	18
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	338,979	342,342
Home Equity [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	281,455	283,073
Home Equity [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	57,524	59,269
Home Equity [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	279,327	280,706
Home Equity [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	56,946	58,797
Home Equity [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,128	2,367
Home Equity [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$578	$472

LOANS_Summary_of_Impaired_Loan

LOANS, Summary of Impaired Loans, Excluding Purchased Impaired (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Impaired loans [Abstract]
Loans with allowance allocation	$0	$0
Loans without allowance allocation	645	0
Carrying balance	645	0
Contractual balance	645	0
Specifically allocated allowance	$0	$0

LOANS_Troubled_Debt_Restructur

LOANS, Troubled Debt Restructuring (TDR) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	Loan	Loan	Loan
Financing Receivable, Modifications [Line Items]
Individual commercial loan evaluated for impairment, minimum	$500,000
TDR included in general loan loss allocation and the qualitative review, maximum	500,000
Troubled debt restructurings, Nonaccrual, Number of loans	66		68
Troubled debt restructurings, Nonaccrual amount	2,493,000		2,752,000
Troubled debt restructurings Accruing, Number of loans	149		157
Troubled debt restructurings, Accruing amount	3,086,000		3,200,000
Troubled Debt Restructurings, Total number of loans	215		225
Troubled debt restructurings, Total amount	5,579,000		5,952,000
TDR occurring during the period, number of contracts	13	30
TDR occurring during the year, post-modification recorded investment	333,000	877,000
Consumer Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Nonaccrual, Number of loans	49		49
Troubled debt restructurings, Nonaccrual amount	2,059,000		2,092,000
Troubled debt restructurings Accruing, Number of loans	36		37
Troubled debt restructurings, Accruing amount	1,641,000		1,770,000
Troubled Debt Restructurings, Total number of loans	85		86
Troubled debt restructurings, Total amount	3,700,000		3,862,000
TDR occurring during the period, number of contracts	4	11
TDR occurring during the year, post-modification recorded investment	213,000	533,000
Business Lending [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Nonaccrual, Number of loans	4		6
Troubled debt restructurings, Nonaccrual amount	307,000		442,000
Troubled debt restructurings Accruing, Number of loans	3		3
Troubled debt restructurings, Accruing amount	463,000		468,000
Troubled Debt Restructurings, Total number of loans	7		9
Troubled debt restructurings, Total amount	770,000		910,000
TDR occurring during the period, number of contracts	0	4
TDR occurring during the year, post-modification recorded investment	0	192,000
Consumer Indirect [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Nonaccrual, Number of loans	0		0
Troubled debt restructurings, Nonaccrual amount	0		0
Troubled debt restructurings Accruing, Number of loans	75		79
Troubled debt restructurings, Accruing amount	649,000		615,000
Troubled Debt Restructurings, Total number of loans	75		79
Troubled debt restructurings, Total amount	649,000		615,000
TDR occurring during the period, number of contracts	7	12
TDR occurring during the year, post-modification recorded investment	101,000	112,000
Consumer Direct [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Nonaccrual, Number of loans	0		0
Troubled debt restructurings, Nonaccrual amount	0		0
Troubled debt restructurings Accruing, Number of loans	22		25
Troubled debt restructurings, Accruing amount	62,000		69,000
Troubled Debt Restructurings, Total number of loans	22		25
Troubled debt restructurings, Total amount	62,000		69,000
TDR occurring during the period, number of contracts	1	2
TDR occurring during the year, post-modification recorded investment	4,000	10,000
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Nonaccrual, Number of loans	13		13
Troubled debt restructurings, Nonaccrual amount	127,000		218,000
Troubled debt restructurings Accruing, Number of loans	13		13
Troubled debt restructurings, Accruing amount	271,000		278,000
Troubled Debt Restructurings, Total number of loans	26		26
Troubled debt restructurings, Total amount	398,000		496,000
TDR occurring during the period, number of contracts	1	1
TDR occurring during the year, post-modification recorded investment	$15,000	$30,000

LOANS_Allowance_for_Loan_Losse

LOANS, Allowance for Loan Losses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for loan losses [Roll Forward]
Beginning balance	$45,341	$44,319
Charge-offs	-2,414	-2,348
Recoveries	1,455	1,226
Provision	623	1,000
Ending balance	45,005	44,197
Consumer Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	10,286	8,994
Charge-offs	-443	-167
Recoveries	21	41
Provision	369	413
Ending balance	10,233	9,281
Business Lending [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	15,787	17,507
Charge-offs	-133	-120
Recoveries	82	171
Provision	-331	-512
Ending balance	15,405	17,046
Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	11,544	10,248
Charge-offs	-1,427	-1,427
Recoveries	1,152	796
Provision	-23	969
Ending balance	11,246	10,586
Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,083	3,181
Charge-offs	-345	-492
Recoveries	193	212
Provision	-52	186
Ending balance	2,879	3,087
Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	2,701	1,830
Charge-offs	-66	-129
Recoveries	7	6
Provision	21	111
Ending balance	2,663	1,818
Unallocated [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,767	2,029
Charge-offs	0	0
Recoveries	0	0
Provision	616	149
Ending balance	2,383	2,178
Acquired Impaired [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	173	530
Charge-offs	0	-13
Recoveries	0	0
Provision	23	-316
Ending balance	$196	$201

GOODWILL_AND_IDENTIFIABLE_INTA2

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$50,345	$50,345
Accumulated Amortization	-39,465	-38,546
Net Carrying Amount	10,880	11,799
Estimated aggregate amortization expense [Abstract]
Apr - Dec 2015	2,489
2016	2,612
2017	1,908
2018	1,424
2019	1,002
Thereafter	1,445
Net Carrying Amount	10,880	11,799
Components of goodwill [Abstract]
Goodwill	379,998	379,998
Goodwill, Activity	0
Accumulated impairment	-4,824	-4,824
Accumulated impairment, Activity	0
Goodwill, net	375,174	375,174	375,174
Goodwill, net, Activity	0
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	40,326	40,326
Accumulated Amortization	-31,042	-30,303
Net Carrying Amount	9,284	10,023
Estimated aggregate amortization expense [Abstract]
Net Carrying Amount	9,284	10,023
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,019	10,019
Accumulated Amortization	-8,423	-8,243
Net Carrying Amount	1,596	1,776
Estimated aggregate amortization expense [Abstract]
Net Carrying Amount	$1,596	$1,776

MANDATORILY_REDEEMABLE_PREFERR2

MANDATORILY REDEEMABLE PREFERRED SECURITIES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Debt Instrument [Line Items]
Number of wholly owned, unconsolidated subsidiary trusts	2
Percent ownership of unconsolidated subsidiary trusts (in hundredths)	100.00%
Community Statutory Trust III [Member]
Terms of preferred securities for each trust [Abstract]
Issuance Date	31-Jul-01
Par Amount	$24.50
Variable Interest Rate Basis	3 month LIBOR
Variable Interest Rate, Basis Spread (in hundredths)	3.58%
Effective Interest Rate (in hundredths)	3.83%
Maturity Date	31-Jul-31
Call Price	Par
Community Capital Trust IV [Member]
Terms of preferred securities for each trust [Abstract]
Issuance Date	8-Dec-06
Par Amount	$75
Variable Interest Rate Basis	3 month LIBOR
Variable Interest Rate, Basis Spread (in hundredths)	1.65%
Effective Interest Rate (in hundredths)	1.92%
Maturity Date	15-Dec-36
Call Price	Par

BENEFIT_PLANS_Details

BENEFIT PLANS (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	$831	$882
Interest cost	1,375	1,318
Expected return on plan assets	-3,042	-2,980
Amortization of unrecognized net loss	366	-77
Amortization of prior service cost	2	1
Net periodic benefit cost	-468	-856
Post-retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	0	0
Interest cost	22	27
Expected return on plan assets	0	0
Amortization of unrecognized net loss	-3	0
Amortization of prior service cost	-45	-45
Net periodic benefit cost	($26)	($18)

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
EARNINGS PER SHARE [Abstract]
Weighted-average anti-dilutive stock options outstanding (in shares)	300,000	40,000
Basic earnings per share [Abstract]
Net income	$22,297	$22,173
Income attributable to unvested stock-based compensation awards	-100	-99
Income available to common shareholders	22,197	22,074
Weighted-average common shares outstanding - basic (in shares)	40,659,000	40,458,000
Basic earnings per share (in dollars per share)	$0.55	$0.55
Diluted earnings per share [Abstract]
Net income	22,297	22,173
Income attributable to unvested stock-based compensation awards	-100	-99
Income available to common shareholders	$22,197	$22,074
Weighted-average common shares outstanding - basic (in shares)	40,659,000	40,458,000
Assumed exercise of stock options (in shares)	405,000	512,000
Weighted-average common shares outstanding - diluted (in shares)	41,064,000	40,970,000
Diluted earnings per share (in dollars per share)	$0.54	$0.54
Stock Repurchase Program [Abstract]
Number of common shares authorized to be repurchased (in shares)			2,000,000
Number of common shares repurchased (in shares)	265,230		123,000

COMMITMENTS_CONTINGENT_LIABILI2

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
	ClassAction
	Director
Off-balance Sheet Risks, Disclosure Information [Line Items]
Face Value Disclosure Off-balance Sheet Risks Face Amount Liability	$809,115,000	$757,743,000
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, lower range	0
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, upper range	1,000,000
Number of class actions in which the Bank is involved	2
Legal settlement, amount	2,800,000
Number of acquiree's directors the acquirer agreed to appoint to the board	2
Commitments to Extend Credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Face Value Disclosure Off-balance Sheet Risks Face Amount Liability	786,327,000	733,827,000
Standby Letters of Credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Face Value Disclosure Off-balance Sheet Risks Face Amount Liability	$22,788,000	$23,916,000

FAIR_VALUE_Details

FAIR VALUE (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Available-for-sale investment securities:
Total available-for-sale investment securities	$2,622,779,000	$2,472,925,000
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Discount on appraisal value of foreclosed real estate, minimum (in hundredths)	10.00%
Discount on appraisal value of foreclosed real estate, maximum (in hundredths)	49.00%
Mortgage servicing rights valuation allowance	0
Fair value of MSRs at end of period	1,400,000
Carrying value before valuation allowance at end of period	1,100,000
Recurring [Member]
Available-for-sale investment securities:
U.S. Treasury and agency securities	1,676,112,000	1,517,733,000
Obligations of state and political subdivisions	672,709,000	671,903,000
Government agency mortgage-backed securities	229,526,000	237,728,000
Corporate debt securities	27,026,000	27,091,000
Government agency collateralized mortgage obligations	16,980,000	18,025,000
Marketable equity securities	426,000	445,000
Total available-for-sale investment securities	2,622,779,000	2,472,925,000
Mortgages loans held for sale	1,437,000	1,042,000
Commitments to originate real estate loans for sale	152,000	185,000
Forward sales commitments	-22,000	-43,000
Total	2,624,346,000	2,474,109,000
Recurring [Member] | Level 1 [Member]
Available-for-sale investment securities:
U.S. Treasury and agency securities	1,676,112,000	1,496,667,000
Obligations of state and political subdivisions	0	0
Government agency mortgage-backed securities	0	0
Corporate debt securities	0	0
Government agency collateralized mortgage obligations	0	0
Marketable equity securities	426,000	445,000
Total available-for-sale investment securities	1,676,538,000	1,497,112,000
Mortgages loans held for sale	0	0
Commitments to originate real estate loans for sale	0	0
Forward sales commitments	0	0
Total	1,676,538,000	1,497,112,000
Recurring [Member] | Level 2 [Member]
Available-for-sale investment securities:
U.S. Treasury and agency securities	0	21,066,000
Obligations of state and political subdivisions	672,709,000	671,903,000
Government agency mortgage-backed securities	229,526,000	237,728,000
Corporate debt securities	27,026,000	27,091,000
Government agency collateralized mortgage obligations	16,980,000	18,025,000
Marketable equity securities	0	0
Total available-for-sale investment securities	946,241,000	975,813,000
Mortgages loans held for sale	1,437,000	1,042,000
Commitments to originate real estate loans for sale	0	0
Forward sales commitments	-22,000	-43,000
Total	947,656,000	976,812,000
Mortgage loans held for sale, at principal value	1,400,000
Mortgage loans held for sale, unrealized gains (losses)	52,000
Recurring [Member] | Level 3 [Member]
Available-for-sale investment securities:
U.S. Treasury and agency securities	0	0
Obligations of state and political subdivisions	0	0
Government agency mortgage-backed securities	0	0
Corporate debt securities	0	0
Government agency collateralized mortgage obligations	0	0
Marketable equity securities	0	0
Total available-for-sale investment securities	0	0
Mortgages loans held for sale	0	0
Commitments to originate real estate loans for sale	152,000	185,000
Forward sales commitments	0	0
Total	152,000	185,000
Non-recurring [Member]
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Other real estate owned	1,767,000	1,855,000
Non-recurring [Member] | Level 1 [Member]
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Other real estate owned	0	0
Non-recurring [Member] | Level 2 [Member]
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Other real estate owned	0	0
Non-recurring [Member] | Level 3 [Member]
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Other real estate owned	$1,767,000	$1,855,000

FAIR_VALUE_Unobservable_Input_

FAIR VALUE, Unobservable Input Reconciliation (Details) (Commitments to Originate Real Estate Loans for Sale [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Commitments to Originate Real Estate Loans for Sale [Member]
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract]
Beginning balance	$185		$44
Total (losses)/gains included in earnings	-185	[1]	-44	[1]
Commitments to originate real estate loans held for sale, net	152		67
Ending balance	$152		$67
[1]	Amounts included in earnings associated with the commitments to originate real estate loans for sale are reported as a component of other banking services in the Consolidated Statement of Income.

FAIR_VALUE_Significant_Unobser

FAIR VALUE, Significant Unobservable Inputs (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	1,767	1,855
Other Real Estate Owned [Member] | Fair Value of Collateral [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant unobservable inputs	Estimated cost of disposal/market adjustment	Estimated cost of disposal/market adjustment
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated cost of disposal/market adjustment (in hundredths)	10.00%	10.00%
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated cost of disposal/market adjustment (in hundredths)	49.20%	77.50%
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated cost of disposal/market adjustment (in hundredths)	23.30%	30.60%
Commitments To Originate Real Estate Loans For Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	152	185
Commitments To Originate Real Estate Loans For Sale [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant unobservable inputs	Embedded servicing value	Embedded servicing value
Embedded servicing value (in hundredths)	1.00%	1.00%

FAIR_VALUE_Balance_Sheet_Group

FAIR VALUE, Balance Sheet Grouping (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Carrying Value [Member]
Financial assets [Abstract]
Net loans	$4,118,906	$4,190,865
Financial liabilities [Abstract]
Deposits	6,126,547	5,935,264
Borrowings	195,700	338,000
Subordinated debt held by unconsolidated subsidiary trusts	102,128	102,122
Fair Value [Member]
Financial assets [Abstract]
Net loans	4,167,605	4,251,565
Financial liabilities [Abstract]
Deposits	6,126,431	5,935,690
Borrowings	195,700	338,000
Subordinated debt held by unconsolidated subsidiary trusts	$86,116	$85,189

DERIVATIVE_INSTRUMENTS_Details

DERIVATIVE INSTRUMENTS (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), net	($12)
Not Designated as Hedging Instrument [Member]
Derivatives, Estimated Fair Value and Balance Sheet Location [Line Items]
Fair Value, net	130
Commitments to originate real estate loans for sale [Member] | Mortgage banking and other services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), net	-33
Forward sales commitments [Member] | Mortgage banking and other services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), net	21
Other Assets [Member] | Commitments to originate real estate loans for sale [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Estimated Fair Value and Balance Sheet Location [Line Items]
Derivative, Notional Amount	5,035
Fair Value, net	152
Other Liabilities [Member] | Forward sales commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Estimated Fair Value and Balance Sheet Location [Line Items]
Derivative, Notional Amount	5,236
Fair Value, net	($22)

SEGMENT_INFORMATION_Details

SEGMENT INFORMATION (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Information about reportable segments
Net interest income	$59,840	$60,108
Provision for loan losses	623	1,000
Noninterest income	29,046	28,354
Amortization of intangible assets	919	1,141
Other operating expenses	55,029	54,780
Income before income taxes	32,315	31,541
Assets	7,576,039	7,397,228	7,489,440
Goodwill	375,174	375,174	375,174
Eliminations [Member]
Information about reportable segments
Net interest income	0	0
Provision for loan losses	0	0
Noninterest income	-464	-474
Amortization of intangible assets	0	0
Other operating expenses	-464	-474
Income before income taxes	0	0
Assets	-22,307	-18,064
Goodwill	0	0
Banking [Member] | Operating Segments [Member]
Information about reportable segments
Net interest income	59,785	60,063
Provision for loan losses	623	1,000
Noninterest income	13,524	13,444
Amortization of intangible assets	739	912
Other operating expenses	43,819	43,711
Income before income taxes	28,128	27,884
Assets	7,549,811	7,370,190
Goodwill	364,495	364,495
Employee Benefit Services [Member] | Operating Segments [Member]
Information about reportable segments
Net interest income	29	23
Provision for loan losses	0	0
Noninterest income	11,353	10,721
Amortization of intangible assets	133	172
Other operating expenses	8,451	8,297
Income before income taxes	2,798	2,275
Assets	32,206	30,719
Goodwill	8,019	8,019
Wealth Management [Member] | Operating Segments [Member]
Information about reportable segments
Net interest income	26	22
Provision for loan losses	0	0
Noninterest income	4,633	4,663
Amortization of intangible assets	47	57
Other operating expenses	3,223	3,246
Income before income taxes	1,389	1,382
Assets	16,329	14,383
Goodwill	$2,660	$2,660