XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans (Changes In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | $ 2,858,843 | $ 2,479,034 | $ 2,858,843 | $ 2,479,034 | $ 2,694,922
Loans, Individually Evaluated for impairment | 6,792 | 9,422 | 6,792 | 9,422 |
Loans, Collectively Evaluated for impairment | 2,852,051 | 2,469,612 | 2,852,051 | 2,469,612 |
Ending balance | 33,955 | 33,159 | 33,955 | 33,159 |
Allowance for loan losses, Individually Evaluated for impairment | 1,743 | 2,803 | 1,743 | 2,803 |
Allowance for loan losses, Collectively Evaluated for impairment | 32,212 | 30,356 | 32,212 | 30,356 |
Beginning balance | 35,594 | 31,081 | 34,672 | 30,934 |
Charge-offs | (3,209) | (3,133) | (6,858) | (7,334) |
Recoveries | 1,530 | 1,379 | 3,152 | 2,946 |
Provision (credit) | 40 | 3,832 | 2,989 | 6,613 |
Commercial Business [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 506,265 | 397,802 | 506,265 | 397,802 | 449,763
Loans, Individually Evaluated for impairment | 4,164 | 7,258 | 4,164 | 7,258 |
Loans, Collectively Evaluated for impairment | 502,101 | 390,544 | 502,101 | 390,544 |
Ending balance | 14,242 | 14,622 | 14,242 | 14,622 |
Allowance for loan losses, Individually Evaluated for impairment | 1,226 | 2,683 | 1,226 | 2,683 |
Allowance for loan losses, Collectively Evaluated for impairment | 13,016 | 11,939 | 13,016 | 11,939 |
Beginning balance | 14,942 | 14,003 | 15,668 | 7,225 |
Charge-offs | (336) | (656) | (441) | (1,778) |
Recoveries | 77 | 88 | 197 | 246 |
Provision (credit) | (441) | 1,187 | (1,182) | 8,929 |
Commercial Mortgage [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 869,192 | 725,793 | 869,192 | 725,793 | 810,851
Loans, Individually Evaluated for impairment | 2,628 | 2,164 | 2,628 | 2,164 |
Loans, Collectively Evaluated for impairment | 866,564 | 723,629 | 866,564 | 723,629 |
Ending balance | 5,371 | 3,906 | 5,371 | 3,906 |
Allowance for loan losses, Individually Evaluated for impairment | 517 | 120 | 517 | 120 |
Allowance for loan losses, Collectively Evaluated for impairment | 4,854 | 3,786 | 4,854 | 3,786 |
Beginning balance | 5,473 | 3,667 | 3,696 | 10,315 |
Charge-offs |  |  | (4) | (10) |
Recoveries | 1 | 38 | 8 | 252 |
Provision (credit) | (103) | 201 | 1,671 | (6,651) |
Residential Real Estate Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 481,841 | 425,285 | 481,841 | 425,285 | 457,761
Loans, Collectively Evaluated for impairment | 481,841 | 425,285 | 481,841 | 425,285 |
Ending balance | 1,255 | 1,247 | 1,255 | 1,247 |
Allowance for loan losses, Collectively Evaluated for impairment | 1,255 | 1,247 | 1,255 | 1,247 |
Beginning balance | 1,400 | 1,440 | 1,322 | 1,478 |
Charge-offs | (10) | (86) | (29) | (100) |
Recoveries | 63 | 8 | 132 | 48 |
Provision (credit) | (198) | (115) | (170) | (179) |
Residential Real Estate Lines [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 110,319 | 115,768 | 110,319 | 115,768 | 113,422
Loans, Collectively Evaluated for impairment | 110,319 | 115,768 | 110,319 | 115,768 |
Ending balance | 248 | 232 | 248 | 232 |
Allowance for loan losses, Collectively Evaluated for impairment | 248 | 232 | 248 | 232 |
Beginning balance | 218 | 214 | 180 | 303 |
Charge-offs | (7) |  | (101) | (43) |
Recoveries | 12 | 46 | 15 | 56 |
Provision (credit) | 25 | (28) | 154 | (84) |
Consumer Indirect [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 874,718 | 797,469 | 874,718 | 797,469 | 845,682
Loans, Collectively Evaluated for impairment | 874,718 | 797,469 | 874,718 | 797,469 |
Ending balance | 12,520 | 12,833 | 12,520 | 12,833 |
Allowance for loan losses, Collectively Evaluated for impairment | 12,520 | 12,833 | 12,520 | 12,833 |
Beginning balance | 13,232 | 11,462 | 13,415 | 11,311 |
Charge-offs | (2,621) | (2,204) | (5,615) | (5,013) |
Recoveries | 1,304 | 1,122 | 2,634 | 2,173 |
Provision (credit) | 605 | 2,453 | 2,086 | 4,362 |
Other Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans, Ending balance | 16,508 | 16,917 | 16,508 | 16,917 | $ 17,443
Loans, Collectively Evaluated for impairment | 16,508 | 16,917 | 16,508 | 16,917 |
Ending balance | 319 | 319 | 319 | 319 |
Allowance for loan losses, Collectively Evaluated for impairment | 319 | 319 | 319 | 319 |
Beginning balance | 329 | 295 | 391 | 302 |
Charge-offs | (235) | (187) | (668) | (390) |
Recoveries | 73 | 77 | 166 | 171 |
Provision (credit) | $ 152 | $ 134 | $ 430 | $ 236 |

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fisi_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fisi_ConsumerIndirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |