XML 68 R34.htm IDEA: XBRL DOCUMENT v2.4.0.8

Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 677,079	$ 618,166
Securities available for sale, Unrealized Gains	9,250	8,830
Securities available for sale, Unrealized Losses	11,679	17,596
Securities available for sale, Fair Value	674,650	609,400
Securities held to maturity, Amortized Cost	253,576	249,785
Securities held to maturity, Unrealized Losses	11,742	18,064
Securities held to maturity, Fair Value	256,091	250,657
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	190,967	135,840
Securities available for sale, Unrealized Gains	1,659	1,414
Securities available for sale, Unrealized Losses	2,132	2,802
Securities available for sale, Fair Value	190,494	134,452
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	253,576	249,785
Securities held to maturity, Unrealized Gains	2,578	1,340
Securities held to maturity, Unrealized Losses	63	468
Securities held to maturity, Fair Value	256,091	250,657
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	486,094	482,308
Securities available for sale, Unrealized Gains	7,263	7,035
Securities available for sale, Unrealized Losses	9,547	14,794
Securities available for sale, Fair Value	483,810	474,549
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	174,591	173,507
Securities available for sale, Unrealized Gains	1,561	1,511
Securities available for sale, Unrealized Losses	3,784	4,810
Securities available for sale, Fair Value	172,368	170,208
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	34,713	36,737
Securities available for sale, Unrealized Gains	641	562
Securities available for sale, Unrealized Losses	130	205
Securities available for sale, Fair Value	35,224	37,094
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	60,857	61,832
Securities available for sale, Unrealized Gains	2,164	2,152
Securities available for sale, Unrealized Losses	113	142
Securities available for sale, Fair Value	62,908	63,842
Collateralized Mortgage Obligations [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	215,933	210,232
Securities available for sale, Unrealized Gains	2,897	2,810
Securities available for sale, Unrealized Losses	5,520	9,637
Securities available for sale, Fair Value	213,310	203,405
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	65,427	63,838
Securities available for sale, Unrealized Gains	339	261
Securities available for sale, Unrealized Losses	1,708	3,195
Securities available for sale, Fair Value	64,058	60,904
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	104,334	102,660
Securities available for sale, Unrealized Gains	232	169
Securities available for sale, Unrealized Losses	3,656	5,856
Securities available for sale, Fair Value	100,910	96,973
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	46,172	43,734
Securities available for sale, Unrealized Gains	924	913
Securities available for sale, Unrealized Losses	156	586
Securities available for sale, Fair Value	46,940	44,061
Collateralized Mortgage Obligations [Member] | Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	1,402	1,467
Securities available for sale, Fair Value	1,402	1,467
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	18	18
Securities available for sale, Unrealized Gains	328	381
Securities available for sale, Fair Value	$ 346	$ 399

X

- Definition

Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

Name:	fisi_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Namespace Prefix:	fisi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

Name:	fisi_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Namespace Prefix:	fisi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity.

+ References

No definition available.

+ Details

Name:	fisi_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Namespace Prefix:	fisi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References

No definition available.

+ Details

Name:	fisi_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix:	fisi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	invest_InvestmentLineItems
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.6)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_HeldToMaturitySecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant