XML 99 R73.htm IDEA: XBRL DOCUMENT
v3.20.4

Allowance for Credit Losses and Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | $ 149,140 |  |  |  | $ 83,968 |  |  |  | $ 149,140 | $ 83,968 | $ 83,369 |  | $ 75,646
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 21,092 | 15,215 | 18,555 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 6,932 | 12,321 | 11,509 |  |
Provision (recapture) for credit losses | (4,700) | $ 7,400 | $ 33,500 | $ 41,500 | 1,614 | $ 299 | $ 218 | $ 1,362 | 77,700 | 3,493 | 14,769 |  |
Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 68,934 |  |  |  | 20,340 |  |  |  | 68,934 | 20,340 | 14,864 |  | 16,260
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 1,419 | 2,160 | 3,840 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 131 | 3,377 | 3,186 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 42,349 | 4,259 | (742) |  |
Commercial Business |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 45,250 |  |  |  | 30,292 |  |  |  | 45,250 | 30,292 | 34,658 |  | 25,101
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 12,396 | 11,290 | 7,437 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 3,438 | 3,066 | 2,829 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 23,154 | 3,858 | 14,165 |  |
Agriculture |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 9,052 |  |  |  | 15,835 |  |  |  | 9,052 | 15,835 | 9,589 |  | 9,662
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 6,427 | 245 | 5,507 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 172 | 299 | 1,104 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 8,797 | 6,192 | 4,330 |  |
Construction |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 7,636 |  |  |  | 8,571 |  |  |  | 7,636 | 8,571 | 14,395 |  | 15,092
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 0 | 242 | 124 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 709 | 3,641 | 1,686 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 106 | (9,223) | (2,259) |  |
Real estate: One-to-four family residential |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 16,875 |  |  |  | 7,435 |  |  |  | 16,875 | 7,435 | 8,024 |  | 8,904
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 84 | 1,196 | 1,451 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 2,083 | 1,773 | 2,516 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 3,204 | (1,166) | (1,945) |  |
Consumer Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | 1,393 |  |  |  | 883 |  |  |  | 1,393 | 883 | 786 |  | 627
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 766 | 82 | 196 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 399 | 165 | 188 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | 99 | 14 | 167 |  |
Unallocated Financing Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: ACL | $ 0 |  |  |  | $ 612 |  |  |  | 0 | 612 | 1,053 |  | $ 0
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Provision (recapture) for credit losses |  |  |  |  |  |  |  |  | $ (9) | $ (441) | $ 1,053 |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | $ 1,632 |
Accounting Standards Update 2016-13 | Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | 7,533 |
Accounting Standards Update 2016-13 | Commercial Business |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | 762 |
Accounting Standards Update 2016-13 | Agriculture |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | (9,325) |
Accounting Standards Update 2016-13 | Construction |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | (1,750) |
Accounting Standards Update 2016-13 | Real estate: One-to-four family residential |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | 4,237 |
Accounting Standards Update 2016-13 | Consumer Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | 778 |
Accounting Standards Update 2016-13 | Unallocated Financing Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in allowance for credit loss due to adoption of new ASU |  |  |  |  |  |  |  |  |  |  |  | $ (603) |

X
- Definition Change in allowance for credit losses due to adoption of new ASU + References No definition available. + Details
Name: | colb_ChangeinallowanceforcreditlossesduetoadoptionofnewASU
Namespace Prefix: | colb_
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_AllowanceForLoanAndLeaseLossesRollForward
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/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=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: 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=121611835&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 writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: 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=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: 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=121586364&loc=d3e3602-108585 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=120399700&loc=SL114874048-224260 Reference 3: 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=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |