XML 88 R72.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 54,842 |
Unpaid Principal Balance Nonaccrual Loans | 65,358 | $ 79,886
Recorded Investment Nonaccrual Loans |  | 66,189
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,949 |
Unpaid Principal Balance Nonaccrual Loans | 3,149 | 4,633
Recorded Investment Nonaccrual Loans |  | 4,149
Commercial business: Secured loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 35,504 |
Unpaid Principal Balance Nonaccrual Loans | 45,072 | 56,865
Recorded Investment Nonaccrual Loans |  | 45,410
Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 9 |
Unpaid Principal Balance Nonaccrual Loans | 9 | 49
Recorded Investment Nonaccrual Loans |  | 50
Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,158 |
Unpaid Principal Balance Nonaccrual Loans | 1,178 | 1,182
Recorded Investment Nonaccrual Loans |  | 785
Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,261 |
Unpaid Principal Balance Nonaccrual Loans | 2,270 | 2,623
Recorded Investment Nonaccrual Loans |  | 2,628
Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,721 |
Unpaid Principal Balance Nonaccrual Loans | 3,062 | 5,410
Recorded Investment Nonaccrual Loans |  | 4,284
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 9,922 |
Unpaid Principal Balance Nonaccrual Loans | 10,300 | 7,270
Recorded Investment Nonaccrual Loans |  | 7,029
Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 318 |
Unpaid Principal Balance Nonaccrual Loans | 318 | 26
Recorded Investment Nonaccrual Loans |  | 25
Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |
Unpaid Principal Balance Nonaccrual Loans | $ 0 | 1,828
Recorded Investment Nonaccrual Loans |  | $ 1,829

X
- Definition Financing Receivable, Recorded Investment, Gross, Nonaccrual Status + References No definition available. + Details
Name: | colb_FinancingReceivableRecordedInvestmentGrossNonaccrualStatus
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable Unpaid Principal Balance Nonaccrual Status. + References No definition available. + Details
Name: | colb_FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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