XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | $ 119,098 | $ 133,885 | $ 117,718 | $ 102,906 | $ 102,906
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 5,126 |  | 27,205 |
Charge-offs | (5,469) | (9,343) | (11,032) | (11,226) | (33,267)
Recoveries | 1,067 | 678 | 2,328 | 1,388 | 3,115
Provision for credit losses | 8,958 | 3,200 | 14,640 | 13,273 |
Ending Balance | 123,654 | 133,546 | 123,654 | 133,546 | 117,718
Time and Demand Loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (3,377) |  | (16,147)
Recoveries |  |  | 394 |  | 260
Commercial Credit Cards |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (102) |  | (105)
Recoveries |  |  | 0 |  | 13
Senior Lien |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (109) |  | (246)
Recoveries |  |  | 113 |  | 177
Junior Lien |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (146) |  | (315)
Recoveries |  |  | 57 |  | 70
Multifamily |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | 0 |  | 0
Recoveries |  |  | 0 |  | 0
Nonowner Occupied Commercial Real Estate |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (470) |  | (4,705)
Recoveries |  |  | 48 |  | 127
Owner Occupied Commercial Real Estate |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (154) |  | (1,572)
Recoveries |  |  | 76 |  | 24
Automobiles |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (3,725) |  | (5,587)
Recoveries |  |  | 1,261 |  | 1,832
Consumer Credit Cards |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (228) |  | (290)
Recoveries |  |  | 45 |  | 87
Other Consumer Loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (915) |  | (1,353)
Recoveries |  |  | 199 |  | 300
Construction Residential |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | 0 |  | 0
Recoveries |  |  | 0 |  | 0
Construction Other |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (35) |  | 0
Recoveries |  |  | 6 |  | 0
Time and Demand Loans Other |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (1,057) |  | (2,410)
Recoveries |  |  | 93 |  | 225
Equipment Finance |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (714) |  | (537)
Recoveries |  |  | 36 |  | 0
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 27,046 | 42,568 | 27,996 | 22,650 | 22,650
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 3,468 |  | 19,417 |
Charge-offs | (2,588) | (6,677) | (5,250) | (7,340) |
Recoveries | 103 | 95 | 523 | 254 |
Provision for credit losses | 6,047 | 2,260 | 7,339 | 6,733 |
Ending Balance | 30,608 | 41,714 | 30,608 | 41,714 | 27,996
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 20,836 | 39,465 | 22,819 | 20,040 | 20,040
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 3,468 |  | 19,417 |
Charge-offs | (1,612) | (6,215) | (3,377) | (6,470) |
Recoveries | 47 | 52 | 394 | 168 |
Provision for credit losses | 4,318 | 1,103 | 3,753 | 4,718 |
Ending Balance | 23,589 | 37,873 | 23,589 | 37,873 | 22,819
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 305 | 331 | 278 | 335 | 335
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 0 |
Charge-offs | (58) | (9) | (102) | (35) |
Recoveries | 0 | 5 | 0 | 7 |
Provision for credit losses | (3) | (7) | 68 | 13 |
Ending Balance | 244 | 320 | 244 | 320 | 278
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 1,579 | 1,311 | 1,500 | 1,189 | 1,189
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 0 |
Charge-offs | (555) | (453) | (1,057) | (790) |
Recoveries | 35 | 38 | 93 | 79 |
Provision for credit losses | 424 | 551 | 947 | 969 |
Ending Balance | 1,483 | 1,447 | 1,483 | 1,447 | 1,500
Commercial, financial, agricultural and other [Member] | Equipment Finance |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4,326 | 1,461 | 3,399 | 1,086 | 1,086
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 0 |
Charge-offs | (363) | 0 | (714) | (45) |
Recoveries | 21 | 0 | 36 | 0 |
Provision for credit losses | 1,308 | 613 | 2,571 | 1,033 |
Ending Balance | 5,292 | 2,074 | 5,292 | 2,074 | 3,399
Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 23,893 | 22,773 | 23,901 | 21,412 | 21,412
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 527 |
Charge-offs | (175) | (1) | (255) | (80) |
Recoveries | 111 | 33 | 170 | 71 |
Provision for credit losses | (1,656) | 935 | (1,643) | 1,810 |
Ending Balance | 22,173 | 23,740 | 22,173 | 23,740 | 23,901
Residential real estate [Member] | Senior Lien |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 16,883 | 15,824 | 16,975 | 14,822 | 14,822
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 197 |
Charge-offs | (81) | (1) | (109) | (17) |
Recoveries | 70 | 17 | 113 | 43 |
Provision for credit losses | (1,127) | 723 | (1,234) | 1,518 |
Ending Balance | 15,745 | 16,563 | 15,745 | 16,563 | 16,975
Residential real estate [Member] | Junior Lien |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 7,010 | 6,949 | 6,926 | 6,590 | 6,590
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 330 |
Charge-offs | (94) | 0 | (146) | (63) |
Recoveries | 41 | 16 | 57 | 28 |
Provision for credit losses | (529) | 212 | (409) | 292 |
Ending Balance | 6,428 | 7,177 | 6,428 | 7,177 | 6,926
Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 39,103 | 39,377 | 37,071 | 28,804 | 28,804
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 1,658 |  | 6,971 |
Charge-offs | (341) | (1,517) | (624) | (1,517) |
Recoveries | 10 | 94 | 124 | 136 |
Provision for credit losses | 3,772 | (685) | 5,973 | 4,533 |
Ending Balance | 42,544 | 38,927 | 42,544 | 38,927 | 37,071
Commercial Real Estate [Member] | Multifamily |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 5,225 | 5,541 | 5,233 | 4,726 | 4,726
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 234 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | (19) | 234 | (27) | 815 |
Ending Balance | 5,206 | 5,775 | 5,206 | 5,775 | 5,233
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 22,064 | 21,552 | 19,995 | 16,426 | 16,426
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 2,739 |
Charge-offs | (187) | 0 | (470) | 0 |
Recoveries | 4 | 86 | 48 | 124 |
Provision for credit losses | 3,155 | 72 | 5,463 | 2,421 |
Ending Balance | 25,036 | 21,710 | 25,036 | 21,710 | 19,995
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 11,814 | 12,284 | 11,843 | 7,652 | 7,652
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 1,658 |  | 3,998 |
Charge-offs | (154) | (1,517) | (154) | (1,517) |
Recoveries | 6 | 8 | 76 | 12 |
Provision for credit losses | 636 | (991) | 537 | 1,297 |
Ending Balance | 12,302 | 11,442 | 12,302 | 11,442 | 11,843
Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 22,507 | 21,218 | 21,332 | 21,218 | 21,218
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 3 |
Charge-offs | (2,330) | (1,148) | (4,868) | (2,289) |
Recoveries | 843 | 456 | 1,505 | 927 |
Provision for credit losses | 920 | 911 | 3,971 | 1,578 |
Ending Balance | 21,940 | 21,437 | 21,940 | 21,437 | 21,332
Loans to individuals [Member] | Automobiles |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 20,243 | 19,013 | 19,142 | 18,819 | 18,819
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 3 |
Charge-offs | (1,783) | (784) | (3,725) | (1,586) |
Recoveries | 708 | 312 | 1,261 | 702 |
Provision for credit losses | 508 | 717 | 2,998 | 1,320 |
Ending Balance | 19,676 | 19,258 | 19,676 | 19,258 | 19,142
Loans to individuals [Member] | Consumer Credit Cards |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 347 | 368 | 372 | 412 | 412
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 0 |
Charge-offs | (78) | (80) | (228) | (146) |
Recoveries | 27 | 30 | 45 | 47 |
Provision for credit losses | 50 | 57 | 157 | 62 |
Ending Balance | 346 | 375 | 346 | 375 | 372
Loans to individuals [Member] | Other Consumer Loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 1,917 | 1,837 | 1,818 | 1,987 | 1,987
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 0 |
Charge-offs | (469) | (284) | (915) | (557) |
Recoveries | 108 | 114 | 199 | 178 |
Provision for credit losses | 362 | 137 | 816 | 196 |
Ending Balance | 1,918 | 1,804 | 1,918 | 1,804 | 1,818
Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 6,549 | 7,949 | 7,418 | 8,822 | 8,822
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 287 |
Charge-offs | (35) | 0 | (35) | 0 |
Recoveries | 0 | 0 | 6 | 0 |
Provision for credit losses | (125) | (221) | (1,000) | (1,381) |
Ending Balance | 6,389 | 7,728 | 6,389 | 7,728 | 7,418
Real estate construction [Member] | Construction Residential |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 748 | 2,058 | 970 | 2,462 | 2,462
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 60 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | (376) | (475) | (598) | (939) |
Ending Balance | 372 | 1,583 | 372 | 1,583 | 970
Real estate construction [Member] | Construction Other |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 5,801 | 5,891 | 6,448 | 6,360 | 6,360
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 0 |  | 227 |
Charge-offs | (35) | 0 | (35) | 0 |
Recoveries | 0 | 0 | 6 | 0 |
Provision for credit losses | 251 | 254 | (402) | (442) |
Ending Balance | $ 6,017 | $ 6,145 | $ 6,017 | $ 6,145 | $ 6,448

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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