XML 53 R41.htm IDEA: XBRL DOCUMENT
v3.25.2

Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2024
Allowance for credit losses on loans and leases |  |  |  |  |  |
Balance, beginning of period | $ 421,495 | $ 414,344 | $ 424,629 | $ 440,871 | $ 440,871 |
Provision (recapture) for credit losses for loans and leases | 28,757 | 34,760 | 54,944 | 52,236 |  |
Charge-offs | (34,599) | (36,201) | (68,712) | (85,954) |  |
Recoveries | 5,254 | 5,768 | 10,046 | 11,518 |  |
Net charge-offs | (29,345) | (30,433) | (58,666) | (74,436) |  |
Balance, end of period | 420,907 | 418,671 | 420,907 | 418,671 | 424,629 | $ 424,629
Reserve for unfunded commitments |  |  |  |  |  |
Balance, beginning of period | 17,384 | 22,868 | 16,168 | 23,208 | 23,208 |
Recapture for credit losses on unfunded commitments | 692 | (2,940) | 1,908 | (3,280) |  |
Balance, end of period | 18,076 | 19,928 | 18,076 | 19,928 | 16,168 | 16,168
Total allowance for credit losses | 438,983 | 438,599 | 438,983 | 438,599 | 440,800 | 440,800
Commercial real estate |  |  |  |  |  |
Allowance for credit losses on loans and leases |  |  |  |  |  |
Balance, beginning of period | 168,393 | 146,276 | 154,413 | 125,888 | 125,888 |
Provision (recapture) for credit losses for loans and leases | (8,564) | (3,096) | 5,516 | 17,095 |  |
Charge-offs | (77) | (585) | (196) | (746) |  |
Recoveries | 71 | 551 | 90 | 909 |  |
Net charge-offs | (6) | (34) | (106) | 163 |  |
Balance, end of period | 159,823 | 143,146 | 159,823 | 143,146 | 154,413 | 154,413
Reserve for unfunded commitments |  |  |  |  |  |
Balance, beginning of period | 7,765 | 13,028 | 5,932 | 11,170 | 11,170 |
Recapture for credit losses on unfunded commitments | (101) | (3,082) | 1,732 | (1,224) |  |
Balance, end of period | 7,664 | 9,946 | 7,664 | 9,946 | 5,932 | 5,932
Total allowance for credit losses | 167,487 | 153,092 | 167,487 | 153,092 |  |
Commercial |  |  |  |  |  |
Allowance for credit losses on loans and leases |  |  |  |  |  |
Balance, beginning of period | 214,483 | 202,757 | 218,668 | 244,821 | 244,821 |
Provision (recapture) for credit losses for loans and leases | 33,776 | 46,320 | 57,866 | 46,756 |  |
Charge-offs | (33,073) | (33,561) | (65,684) | (80,793) |  |
Recoveries | 4,676 | 4,198 | 9,012 | 8,930 |  |
Net charge-offs | (28,397) | (29,363) | (56,672) | (71,863) |  |
Balance, end of period | 219,862 | 219,714 | 219,862 | 219,714 | 218,668 | 218,668
Reserve for unfunded commitments |  |  |  |  |  |
Balance, beginning of period | 7,009 | 5,890 | 6,935 | 7,841 | 7,841 |
Recapture for credit losses on unfunded commitments | 812 | 657 | 886 | (1,294) |  |
Balance, end of period | 7,821 | 6,547 | 7,821 | 6,547 | 6,935 | 6,935
Total allowance for credit losses | 227,683 | 226,261 | 227,683 | 226,261 |  |
Residential |  |  |  |  |  |
Allowance for credit losses on loans and leases |  |  |  |  |  |
Balance, beginning of period | 32,645 | 58,010 | 44,700 | 62,004 | 62,004 |
Provision (recapture) for credit losses for loans and leases | 2,043 | (9,032) | (9,807) | (12,706) |  |
Charge-offs | (285) | (504) | (588) | (994) |  |
Recoveries | 187 | 411 | 285 | 581 |  |
Net charge-offs | (98) | (93) | (303) | (413) |  |
Balance, end of period | 34,590 | 48,885 | 34,590 | 48,885 | 44,700 | 44,700
Reserve for unfunded commitments |  |  |  |  |  |
Balance, beginning of period | 1,516 | 2,757 | 2,084 | 2,940 | 2,940 |
Recapture for credit losses on unfunded commitments | (37) | (479) | (605) | (662) |  |
Balance, end of period | 1,479 | 2,278 | 1,479 | 2,278 | 2,084 | 2,084
Total allowance for credit losses | 36,069 | 51,163 | 36,069 | 51,163 |  |
Consumer & other |  |  |  |  |  |
Allowance for credit losses on loans and leases |  |  |  |  |  |
Balance, beginning of period | 5,974 | 7,301 | 6,848 | 8,158 | 8,158 |
Provision (recapture) for credit losses for loans and leases | 1,502 | 568 | 1,369 | 1,091 |  |
Charge-offs | (1,164) | (1,551) | (2,244) | (3,421) |  | (6,339)
Recoveries | 320 | 608 | 659 | 1,098 |  |
Net charge-offs | (844) | (943) | (1,585) | (2,323) |  |
Balance, end of period | 6,632 | 6,926 | 6,632 | 6,926 | 6,848 | 6,848
Reserve for unfunded commitments |  |  |  |  |  |
Balance, beginning of period | 1,094 | 1,193 | 1,217 | 1,257 | 1,257 |
Recapture for credit losses on unfunded commitments | 18 | (36) | (105) | (100) |  |
Balance, end of period | 1,112 | 1,157 | 1,112 | 1,157 | $ 1,217 | $ 1,217
Total allowance for credit losses | $ 7,744 | $ 8,083 | $ 7,744 | $ 8,083 |  |

X
- Definition Financing Receivable, Allowance for Credit Loss and Unfunded Lending Commitments, Excluding Accrued Interest, Total + References No definition available. + Details
Name: | colb_FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsExcludingAccruedInterestTotal
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: 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_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: 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 2: 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_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease. + References Reference 1: 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_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
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_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: |