XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.5.0.2

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | $ 1,216,566 | $ 1,168,633
Interest receivable on loans | 2,912 | 2,870
Total recorded investment in loans | 1,219,478 | 1,171,503
Commercial and Agricultural [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total recorded investment in loans | 184,348 | 193,700
Commercial Mortgages [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total recorded investment in loans | 577,118 | 507,700
Commercial Mortgages [Member] | Construction [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 35,051 | 41,131
Total recorded investment in loans | 35,134 | 41,231
Commercial Mortgages [Member] | Commercial Mortgages Other [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 540,710 | 465,347
Total recorded investment in loans | 541,984 | 466,469
Residential Mortgages [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 197,665 | 195,778
Total recorded investment in loans | 198,142 | 196,236
Consumer Loans [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total recorded investment in loans | 259,870 | 273,867
Consumer Loans [Member] | Credit Cards [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 1,352 | 1,483
Total recorded investment in loans | 1,352 | 1,482
Consumer Loans [Member] | Home Equity Lines and Loans [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 98,378 | 101,726
Total recorded investment in loans | 98,629 | 101,977
Consumer Loans [Member] | Indirect Consumer Loans [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 141,489 | 151,327
Total recorded investment in loans | 141,817 | 151,726
Consumer Loans [Member] | Direct Consumer Loans [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 18,007 | 18,608
Total recorded investment in loans | 18,072 | 18,682
Commercial and Industrial Sector [Member] | Commercial and Agricultural [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 183,508 | 192,197
Total recorded investment in loans | 183,941 | 192,661
Agricultural Sector [Member] | Commercial and Agricultural [Member] |  |
Composition of loan portfolio [Abstract] |  |
Total loans, net of deferred origination fees and costs | 406 | 1,036
Total recorded investment in loans | $ 407 | $ 1,039

X
- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + 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 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_InterestReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=chmg_CommercialAndAgriculturalPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_CommercialAndIndustrialSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_AgriculturalSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |