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Short-Term Borrowings and Long-Term Debt Subordinated Debt (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2020 USD ($) subsidiarytrusts | Mar. 31, 2020 USD ($) | Mar. 31, 2017 USD ($) | Nov. 30, 2014 USD ($)
Subordinated Debt [Abstract] |  |  |  |  |
Subsidiary trusts owned by parent | subsidiarytrusts |  | 3 |  |  |
Senior Notes |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 125,000,000.0 |
Effective interest rate |  |  |  | 3.95% |
Stated interest rate |  |  |  | 3.60% |
Junior subordinated deferrable interest debentures |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Subordinated Debt |  | $ 16,496,000 |  |  |
Junior subordinated deferrable interest debentures | Columbia Bancorp Statutory Trust |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Interest Rate |  | 2.96% |  |  |
Subordinated Debt |  | $ 6,186,000 |  |  |
Call Price |  | 1.000 |  |  |
Junior subordinated deferrable interest debentures | Columbia Bancorp Statutory Trust II |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Interest Rate |  | 2.14% |  |  |
Subordinated Debt |  | $ 4,124,000 |  |  |
Call Price |  | 1.000 |  |  |
Junior subordinated deferrable interest debentures | Columbia Bancorp Statutory Trust III |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Interest Rate |  | 2.02% |  |  |
Subordinated Debt |  | $ 6,186,000 |  |  |
Call Price |  | 1.000 |  |  |
Subordinated debt |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Debt instrument, face amount | $ 150,000,000.0 |  |  |  |
Interest Rate | 4.50% |  |  |  |
Effective interest rate | 4.69% |  |  |  |
Subordinated debt | November 2024 Subordinated Debt |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Effective interest rate |  |  |  |  | 4.87%
Subordinated Debt |  |  |  |  | $ 100,000,000.0
Stated interest rate |  |  |  |  | 4.50%
Subordinated debt | 3.25% Notes due 2030 [Member] |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Debt instrument, face amount |  |  | $ 200,000,000.0 |  |
Effective interest rate |  |  | 3.35% |  |
Stated interest rate |  |  | 3.25% |  |
Subordinated debt | 3.75% Notes due 2035 [Member] |  |  |  |  |
Subordinated Debt [Abstract] |  |  |  |  |
Debt instrument, face amount |  |  | $ 175,000,000.0 |  |
Effective interest rate |  |  | 3.85% |  |
Stated interest rate |  |  | 3.75% |  |

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- Definition Subordinated Borrowing Callable Price + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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