XML 66 R26.htm IDEA: XBRL DOCUMENT
v3.2.0.727

LOANS (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of Loans Receivable, Net | The balances of these classes are summarized as follows:
(000's omitted) |  | June 30, 2015 |  |  | December 31, 2014 |
Consumer mortgage |  | $ | 1,608,064 |  |  | $ | 1,613,384 |
Business lending |  |  | 1,295,889 |  |  |  | 1,262,484 |
Consumer indirect |  |  | 837,449 |  |  |  | 833,968 |
Consumer direct |  |  | 181,623 |  |  |  | 184,028 |
Home equity |  |  | 340,578 |  |  |  | 342,342 |
Gross loans, including deferred origination costs |  |  | 4,263,603 |  |  |  | 4,236,206 |
Allowance for loan losses |  |  | (45,282 | ) |  |  | (45,341 | )
Loans, net of allowance for loan losses |  | $ | 4,218,321 |  |  | $ | 4,190,865 |
Schedule of Accretable Discount Related to Credit Impaired Acquired Loans | The outstanding balance related to credit impaired acquired loans was $5.7 million and $6.1 million at June 30, 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 |  |  | (296 | )
Net reclassification to accretable from non-accretable |  |  | 155 |
Balance at June 30, 2015 |  | $ | 564 |
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 June 30, 2015: Legacy Loans (excludes loans acquired after January 1, 2009)
(000’s omitted) |  | Past Due 30 – 89 Days |  |  | 90+ Days Past Due and Still Accruing |  |  | Nonaccrual |  |  | Total Past Due |  |  | Current |  |  | Total Loans |
Consumer mortgage |  | $ | 9,091 |  |  | $ | 998 |  |  | $ | 13,346 |  |  | $ | 23,435 |  |  | $ | 1,521,011 |  |  | $ | 1,544,446 |
Business lending |  |  | 1,929 |  |  |  | 265 |  |  |  | 3,113 |  |  |  | 5,307 |  |  |  | 1,162,250 |  |  |  | 1,167,557 |
Consumer indirect |  |  | 8,536 |  |  |  | 26 |  |  |  | 0 |  |  |  | 8,562 |  |  |  | 828,170 |  |  |  | 836,732 |
Consumer direct |  |  | 964 |  |  |  | 8 |  |  |  | 1 |  |  |  | 973 |  |  |  | 176,270 |  |  |  | 177,243 |
Home equity |  |  | 1,135 |  |  |  | 166 |  |  |  | 2,098 |  |  |  | 3,399 |  |  |  | 282,016 |  |  |  | 285,415 |
Total |  | $ | 21,655 |  |  | $ | 1,463 |  |  | $ | 18,558 |  |  | $ | 41,676 |  |  | $ | 3,969,717 |  |  | $ | 4,011,393 |
Acquired Loans (includes loans acquired after January 1, 2009)
(000’s omitted) |  | Past Due 30 – 89 Days |  |  | 90+ Days Past Due and Still Accruing |  |  | Nonaccrual |  |  | Total Past Due |  |  | Acquired Impaired(1) |  |  | Current |  |  | Total Loans |
Consumer mortgage |  | $ | 1,224 |  |  | $ | 60 |  |  | $ | 1,759 |  |  | $ | 3,043 |  |  | $ | 0 |  |  | $ | 60,575 |  |  | $ | 63,618 |
Business lending |  |  | 101 |  |  |  | 0 |  |  |  | 718 |  |  |  | 819 |  |  |  | 5,138 |  |  |  | 122,375 |  |  |  | 128,332 |
Consumer indirect |  |  | 21 |  |  |  | 0 |  |  |  | 0 |  |  |  | 21 |  |  |  | 0 |  |  |  | 696 |  |  |  | 717 |
Consumer direct |  |  | 70 |  |  |  | 0 |  |  |  | 18 |  |  |  | 88 |  |  |  | 0 |  |  |  | 4,292 |  |  |  | 4,380 |
Home equity |  |  | 369 |  |  |  | 35 |  |  |  | 387 |  |  |  | 791 |  |  |  | 0 |  |  |  | 54,372 |  |  |  | 55,163 |
Total |  | $ | 1,785 |  |  | $ | 95 |  |  | $ | 2,882 |  |  | $ | 4,762 |  |  | $ | 5,138 |  |  | $ | 242,310 |  |  | $ | 252,210 |
(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)
(000’s omitted) |  | Past Due 30 – 89 Days |  |  | 90+ Days Past Due and Still Accruing |  |  | Nonaccrual |  |  | Total 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)
(000’s omitted) |  | Past Due 30 – 89 Days |  |  | 90+ Days Past Due and Still Accruing |  |  | Nonaccrual |  |  | Total Past Due |  |  | Acquired 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 June 30, 2015 and December 31, 2014 follows:
(000’s omitted) |  | June 30, 2015 |  |  | December 31, 2014 |
Loans with allowance allocation |  | $ | 569 |  |  | $ | 0 |
Loans without allowance allocation |  |  | 614 |  |  |  | 0 |
Carrying balance |  |  | 1,183 |  |  |  | 0 |
Contractual balance |  |  | 1,193 |  |  |  | 0 |
Specifically allocated allowance |  |  | 63 |  |  |  | 0 |
Troubled Debt Restructurings on Financing Receivables | Information regarding TDRs as of June 30, 2015 and December 31, 2014 is as follows:
|  | June 30, 2015 |  |  | December 31, 2014 |
(000’s omitted) |  | Nonaccrual |  |  | Accruing |  |  | Total |  |  | Nonaccrual |  |  | Accruing |  |  | Total |
|  |  | # |  |  | Amount |  |  |  | # |  |  | Amount |  |  |  | # |  |  | Amount |  |  | # |  |  | Amount |  |  |  | # |  |  | Amount |  |  |  | # |  |  | Amount |
Consumer mortgage |  |  | 44 |  |  | $ | 1,691 |  |  |  | 35 |  |  | $ | 1,544 |  |  |  | 79 |  |  | $ | 3,235 |  |  | 49 |  |  | $ | 2,092 |  |  |  | 37 |  |  | $ | 1,770 |  |  |  | 86 |  |  | $ | 3,862 |
Business lending |  |  | 3 |  |  |  | 228 |  |  |  | 4 |  |  |  | 572 |  |  |  | 7 |  |  |  | 800 |  |  | 6 |  |  |  | 442 |  |  |  | 3 |  |  |  | 468 |  |  |  | 9 |  |  |  | 910 |
Consumer indirect |  |  | 0 |  |  |  | 0 |  |  |  | 72 |  |  |  | 653 |  |  |  | 72 |  |  |  | 653 |  |  | 0 |  |  |  | 0 |  |  |  | 79 |  |  |  | 615 |  |  |  | 79 |  |  |  | 615 |
Consumer direct |  |  | 0 |  |  |  | 0 |  |  |  | 19 |  |  |  | 47 |  |  |  | 19 |  |  |  | 47 |  |  | 0 |  |  |  | 0 |  |  |  | 25 |  |  |  | 69 |  |  |  | 25 |  |  |  | 69 |
Home equity |  |  | 8 |  |  |  | 108 |  |  |  | 12 |  |  |  | 264 |  |  |  | 20 |  |  |  | 372 |  |  | 13 |  |  |  | 218 |  |  |  | 13 |  |  |  | 278 |  |  |  | 26 |  |  |  | 496 |
Total |  |  | 55 |  |  | $ | 2,027 |  |  |  | 142 |  |  | $ | 3,080 |  |  |  | 197 |  |  | $ | 5,107 |  |  | 68 |  |  | $ | 2,752 |  |  |  | 157 |  |  | $ | 3,200 |  |  |  | 225 |  |  | $ | 5,952 |
The following tables present information related to loans modified in a TDR during the three and six months ended June 30, 2015 and 2014. Of the loans noted in the table below, all loans for the three months ended June 30, 2015 and 2014 were modified due to a Chapter 7 bankruptcy as described previously. The financial effects of these restructurings were immaterial.
|  | Three Months Ended June 30, 2015 |  |  | Three Months Ended June 30, 2014 |
(000’s omitted) |  | Number of loans modified |  |  | Outstanding Balance |  |  | Number of loans modified |  |  | Outstanding Balance |
Consumer mortgage |  |  | 2 |  |  | $ | 61 |  |  | 8 |  |  | $ | 420 |
Business lending |  |  | 0 |  |  |  | 0 |  |  | 4 |  |  |  | 391 |
Consumer indirect |  |  | 6 |  |  |  | 84 |  |  | 9 |  |  |  | 96 |
Consumer direct |  |  | 1 |  |  |  | 1 |  |  | 1 |  |  |  | 2 |
Home equity |  |  | 0 |  |  |  | 0 |  |  | 4 |  |  |  | 126 |
Total |  |  | 9 |  |  | $ | 146 |  |  | 26 |  |  | $ | 1,035 |
|  | Six Months Ended June 30, 2015 |  |  | Six Months Ended June 30, 2014 |
(000’s omitted) |  | Number of loans modified |  |  | Outstanding Balance |  |  | Number of loans modified |  |  | Outstanding Balance |
Consumer mortgage |  |  | 6 |  |  | $ | 280 |  |  | 19 |  |  | $ | 941 |
Business lending |  |  | 0 |  |  |  | 0 |  |  | 8 |  |  |  | 580 |
Consumer indirect |  |  | 12 |  |  |  | 163 |  |  | 18 |  |  |  | 201 |
Consumer direct |  |  | 2 |  |  |  | 4 |  |  | 3 |  |  |  | 11 |
Home equity |  |  | 1 |  |  |  | 14 |  |  | 5 |  |  |  | 155 |
Total |  |  | 21 |  |  | $ | 461 |  |  | 53 |  |  | $ | 1,888 |
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 June 30, 2015 |
(000’s omitted) |  | Consumer Mortgage |  |  | Business Lending |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home Equity |  |  | Unallocated |  |  | Acquired Impaired |  |  | Total |
Beginning balance |  | $ | 10,233 |  |  | $ | 15,405 |  |  | $ | 11,246 |  |  | $ | 2,879 |  |  | $ | 2,663 |  |  | $ | 2,383 |  |  | $ | 196 |  |  | $ | 45,005 |
Charge-offs |  |  | (199 | ) |  |  | (299 | ) |  |  | (1,397 | ) |  |  | (294 | ) |  |  | (56 | ) |  |  | 0 |  |  |  | (43 | ) |  |  | (2,288 | )
Recoveries |  |  | 45 |  |  |  | 527 |  |  |  | 1,184 |  |  |  | 199 |  |  |  | 19 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,974 |
Provision |  |  | 113 |  |  |  | (280 | ) |  |  | 569 |  |  |  | 207 |  |  |  | 51 |  |  |  | (9 | ) |  |  | (60 | ) |  |  | 591 |
Ending balance |  | $ | 10,192 |  |  | $ | 15,353 |  |  | $ | 11,602 |  |  | $ | 2,991 |  |  | $ | 2,677 |  |  | $ | 2,374 |  |  | $ | 93 |  |  | $ | 45,282 |
| Three Months Ended June 30, 2014 |
(000’s omitted) | Consumer Mortgage |  | Business Lending |  | Consumer Indirect |  | Consumer Direct |  | Home Equity |  |  |  | Unallocated |  | Acquired Impaired |  |  |  | Total |
Beginning balance |  | $ | 9,281 |  |  | $ | 17,046 |  |  | $ | 10,586 |  |  | $ | 3,087 |  |  | $ | 1,818 |  |  | $ | 2,178 |  |  | $ | 201 |  |  | $ | 44,197 |
Charge-offs |  |  | (364 | ) |  |  | (385 | ) |  |  | (1,435 | ) |  |  | (420 | ) |  |  | (246 | ) |  |  | 0 |  |  |  | (7 | ) |  |  | (2,857 | )
Recoveries |  |  | 12 |  |  |  | 100 |  |  |  | 1,005 |  |  |  | 226 |  |  |  | 32 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,375 |
Provision |  |  | 446 |  |  |  | (208 | ) |  |  | 1,198 |  |  |  | 405 |  |  |  | 256 |  |  |  | (166 | ) |  |  | (31 | ) |  |  | 1,900 |
Ending balance |  | $ | 9,375 |  |  | $ | 16,553 |  |  | $ | 11,354 |  |  | $ | 3,298 |  |  | $ | 1,860 |  |  | $ | 2,012 |  |  | $ | 163 |  |  | $ | 44,615 |
|  | Six Months Ended June 30, 2015 |
(000’s omitted) |  | Consumer Mortgage |  |  | Business Lending |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home Equity |  |  | Unallocated |  |  | Acquired Impaired |  |  | Total |
Beginning balance |  | $ | 10,286 |  |  | $ | 15,787 |  |  | $ | 11,544 |  |  | $ | 3,083 |  |  | $ | 2,701 |  |  | $ | 1,767 |  |  | $ | 173 |  |  | $ | 45,341 |
Charge-offs |  |  | (642 | ) |  |  | (433 | ) |  |  | (2,823 | ) |  |  | (639 | ) |  |  | (122 | ) |  |  | 0 |  |  |  | (43 | ) |  |  | (4,702 | )
Recoveries |  |  | 66 |  |  |  | 608 |  |  |  | 2,337 |  |  |  | 392 |  |  |  | 26 |  |  |  | 0 |  |  |  | 0 |  |  |  | 3,429 |
Provision |  |  | 482 |  |  |  | (609 | ) |  |  | 544 |  |  |  | 155 |  |  |  | 72 |  |  |  | 607 |  |  |  | (37 | ) |  |  | 1,214 |
Ending balance |  | $ | 10,192 |  |  | $ | 15,353 |  |  | $ | 11,602 |  |  | $ | 2,991 |  |  | $ | 2,677 |  |  | $ | 2,374 |  |  | $ | 93 |  |  | $ | 45,282 |
|  | Six Months Ended June 30, 2014 |
(000’s omitted) |  | Consumer Mortgage |  |  | Business Lending |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home Equity |  |  | Unallocated |  |  | Acquired Impaired |  |  | Total |
Beginning balance |  | $ | 8,994 |  |  | $ | 17,507 |  |  | $ | 10,248 |  |  | $ | 3,181 |  |  | $ | 1,830 |  |  | $ | 2,029 |  |  | $ | 530 |  |  | $ | 44,319 |
Charge-offs |  |  | (531 | ) |  |  | (505 | ) |  |  | (2,862 | ) |  |  | (912 | ) |  |  | (375 | ) |  |  | 0 |  |  |  | (20 | ) |  |  | (5,205 | )
Recoveries |  |  | 53 |  |  |  | 271 |  |  |  | 1,801 |  |  |  | 438 |  |  |  | 38 |  |  |  | 0 |  |  |  | 0 |  |  |  | 2,601 |
Provision |  |  | 859 |  |  |  | (720 | ) |  |  | 2,167 |  |  |  | 591 |  |  |  | 367 |  |  |  | (17 | ) |  |  | (347 | ) |  |  | 2,900 |
Ending balance |  | $ | 9,375 |  |  | $ | 16,553 |  |  | $ | 11,354 |  |  | $ | 3,298 |  |  | $ | 1,860 |  |  | $ | 2,012 |  |  | $ | 163 |  |  | $ | 44,615 |
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:
|  | June 30, 2015 |  |  | December 31, 2014 |
(000’s omitted) |  | Legacy |  |  | Acquired |  |  | Total |  |  | Legacy |  |  | Acquired |  |  | Total |
Pass |  | $ | 998,964 |  |  | $ | 88,229 |  |  | $ | 1,087,193 |  |  | $ | 949,960 |  |  | $ | 93,510 |  |  | $ | 1,043,470 |
Special mention |  |  | 104,313 |  |  |  | 14,140 |  |  |  | 118,453 |  |  |  | 103,176 |  |  |  | 18,038 |  |  |  | 121,214 |
Classified |  |  | 64,280 |  |  |  | 20,825 |  |  |  | 85,105 |  |  |  | 71,458 |  |  |  | 21,030 |  |  |  | 92,488 |
Doubtful |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Acquired impaired |  |  | 0 |  |  |  | 5,138 |  |  |  | 5,138 |  |  |  | 0 |  |  |  | 5,312 |  |  |  | 5,312 |
Total |  | $ | 1,167,557 |  |  | $ | 128,332 |  |  | $ | 1,295,889 |  |  | $ | 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 June 30, 2015: Legacy Loans (excludes loans acquired after January 1, 2009)
(000’s omitted) |  | Consumer Mortgage |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home Equity |  |  | Total |
Performing |  | $ | 1,530,102 |  |  | $ | 836,706 |  |  | $ | 177,234 |  |  | $ | 283,151 |  |  | $ | 2,827,193 |
Nonperforming |  |  | 14,344 |  |  |  | 26 |  |  |  | 9 |  |  |  | 2,264 |  |  |  | 16,643 |
Total |  | $ | 1,544,446 |  |  | $ | 836,732 |  |  | $ | 177,243 |  |  | $ | 285,415 |  |  | $ | 2,843,836 |
Acquired Loans (includes loans acquired after January 1, 2009)
(000’s omitted) |  | Consumer Mortgage |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home Equity |  |  | Total |
Performing |  | $ | 61,799 |  |  | $ | 717 |  |  | $ | 4,362 |  |  | $ | 54,741 |  |  | $ | 121,619 |
Nonperforming |  |  | 1,819 |  |  |  | 0 |  |  |  | 18 |  |  |  | 422 |  |  |  | 2,259 |
Total |  | $ | 63,618 |  |  | $ | 717 |  |  | $ | 4,380 |  |  | $ | 55,163 |  |  | $ | 123,878 |
The following table details the balances in all other loan categories at December 31, 2014: Legacy Loans (excludes loans acquired after January 1, 2009)
(000’s omitted) |  | Consumer Mortgage |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home 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)
(000’s omitted) |  | Consumer Mortgage |  |  | Consumer Indirect |  |  | Consumer Direct |  |  | Home 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 |

X
- Definition Tabular disclosure of changes to the aggregate cash flows related to loans expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
Name: | cbu_ScheduleOfAccretableDiscountRelatedToCreditImpairedAcquiredLoansTableTextBlock
Namespace Prefix: | cbu_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
Name: | us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=32702940&loc=SL6953803-111525 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953659-111524 + Details
Name: | us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
Name: | us-gaap_PastDueFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables and troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
Name: | us-gaap_TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

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