XML 70 R49.htm IDEA: XBRL DOCUMENT
v3.22.4

Federal Home Loan Bank and Federal Reserve Bank Borrowings (Tables) - Federal Home Loan Bank Advances [Member] | 12 Months Ended
--- | ---
Dec. 31, 2022
Debt Instrument [Line Items] |
Schedule of Maturities of Long-term Debt | At December 31, 2022, FHLB advances were scheduled to mature as follows:
|  | Federal Home Loan Bank Advances Fixed rate advances
|  | Weighted Average Rate |  | Amount
|  | (dollars in thousands)
Within 1 year |  | 4.42 | % |  | $ | 949,000 |
Due after 10 years |  | 5.37 | % |  | 5,000 |
Total |  | 954,000 |
Valuation adjustment from acquisition accounting |  | 315 |
Total |  | $ | 954,315 |
Debt Instrument Activity For Year | The maximum, average outstanding and year end balances and average interest rates on advances from the FHLB were as follows for the years ended December 31, 2022, 2021 and 2020:
|  | Years ended December 31,
|  | 2022 |  | 2021 |  | 2020
|  | (dollars in thousands)
Balance at end of period |  | $ | 954,315 |  |  | $ | 7,359 |  |  | $ | 7,414 |
Average balance during period |  | $ | 112,012 |  |  | $ | 7,388 |  |  | $ | 341,643 |
Maximum month end balance during period |  | $ | 954,315 |  |  | $ | 7,409 |  |  | $ | 1,005,464 |
Weighted average rate during period |  | 4.23 | % |  | 4.94 | % |  | 1.82 | %
Weighted average rate at December 31 |  | 4.43 | % |  | 4.94 | % |  | 4.94 | %

X
- Definition Debt Instrument Activity For Year [Table Text Block] + References No definition available. + Details
Name: | colb_DebtInstrumentActivityForYearTableTextBlock
Namespace Prefix: | colb_
Data Type: | dtr-types: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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 + Details
Name: | us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |