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Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | [2] | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current Federal Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | $ 33,400 | $ 39,708 | $ 41,365
Federal operating loss carryforwards, set to begin to expire in 2024 | $ 20,200 |  |  |  |  |  |  |  |  | 20,200 |  |
Idaho state operating loss carryforwards, set to begin to expire in 2024 | 18,700 |  |  |  |  |  |  |  |  | 18,700 |  |
Interest and penalties on unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 0 | 0 |
State operating loss carryforwards, set to begin to expire in 2024 | 132 |  |  |  |  |  |  |  |  | 132 |  |
Unrecognized tax position | 0 |  |  |  | $ 0 |  |  |  |  | 0 | 0 |
Current State and Local Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 5,446 | 3,016 | 1,704
Current tax (benefit) expense |  |  |  |  |  |  |  |  |  | 38,846 | 42,724 | 43,069
Deferred State and Local Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 399 | 907 | 1,296
Deferred Federal Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (291) | 21,524 | 550
Deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  | 108 | 22,431 | 1,846
Income tax provision | 10,734 | $ 11,406 | $ 9,999 | $ 6,815 | 25,123 | [1] | $ 18,338 | $ 11,120 | $ 10,574 | 38,954 | 65,155 | 44,915
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses | 20,578 |  |  |  | 18,315 |  |  |  |  | 20,578 | 18,315 |
Supplemental executive retirement plan | 9,501 |  |  |  | 9,539 |  |  |  |  | 9,501 | 9,539 |
Stock option and restricted stock | 1,850 |  |  |  | 1,438 |  |  |  |  | 1,850 | 1,438 |
OREO | 288 |  |  |  | 521 |  |  |  |  | 288 | 521 |
Nonaccrual interest | 446 |  |  |  | 163 |  |  |  |  | 446 | 163 |
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 10,129 |  |  |  | 5,992 |  |  |  |  | 10,129 | 5,992 |
Deferred Tax Assets, Operating Loss Carryforwards | 5,356 |  |  |  | 7,259 |  |  |  |  | 5,356 | 7,259 |
Other | (733) |  |  |  | (985) |  |  |  |  | (733) | (985) |
Total deferred tax assets | 48,881 |  |  |  | 44,212 |  |  |  |  | 48,881 | 44,212 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Asset purchase tax basis difference | (7,229) |  |  |  | (5,709) |  |  |  |  | (7,229) | (5,709) |
FHLB stock dividends | (790) |  |  |  | (782) |  |  |  |  | (790) | (782) |
Deferred loan fees | (4,399) |  |  |  | (4,505) |  |  |  |  | (4,399) | (4,505) |
Deferred tax liabilities, purchase accounting | (9,245) |  |  |  | (9,088) |  |  |  |  | (9,245) | (9,088) |
Depreciation | (2,609) |  |  |  | (1,581) |  |  |  |  | (2,609) | (1,581) |
Deferred Tax Liabilities, Other | (195) |  |  |  | (2,036) |  |  |  |  | (195) | (2,036) |
Total deferred tax liabilities | 24,467 |  |  |  | 23,701 |  |  |  |  | 24,467 | 23,701 |
Net deferred tax (liability) asset | 24,414 |  |  |  | 20,511 |  |  |  |  | 24,414 | 20,511 |
Reconciliation of effective income tax rate with federal statutory tax rate |  |  |  |  |  |  |  |  |  |  |  |
Income tax based on statutory rate |  |  |  |  |  |  |  |  |  | $ 44,485 | $ 62,262 | $ 52,424
Income tax based on statutory rate, percent |  |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Federal income tax rate 2018 |  |  |  |  |  |  |  |  |  | 21.00% |  |
Tax exempt instrument |  |  |  |  |  |  |  |  |  | $ (6,423) | $ (8,485) | $ (7,433)
Tax exempt instrument, percent |  |  |  |  |  |  |  |  |  | (3.00%) | (5.00%) | (5.00%)
Life insurance proceeds |  |  |  |  |  |  |  |  |  | $ (1,261) | $ (3,351) | $ (1,680)
Life insurance proceeds, percent |  |  |  |  |  |  |  |  |  | (1.00%) | (2.00%) | (1.00%)
effective income tax rate reconciliation, nondeductible expense, business combination, amount |  |  |  |  |  |  |  |  |  | $ 0 | $ 825 | $ 0
effective income tax rate reconciliation, nondeductible expense, business combination, percent |  |  |  |  |  |  |  |  |  | 0.00% | 1.00% | 0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  |  |  |  |  |  |  | $ 0 | $ 12,210 | $ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  |  |  |  |  |  | 0.00% | 7.00% | 0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  |  |  |  |  |  |  |  |  | $ 4,931 | $ 2,550 | $ 1,950
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  |  |  |  |  |  |  |  | 2.00% | 1.00% | 1.00%
Other, net |  |  |  |  |  |  |  |  |  | $ (2,778) | $ (856) | $ (346)
Other, net, percent |  |  |  |  |  |  |  |  |  | (1.00%) | 0.00% | 0.00%
Income tax provision | $ 10,734 | $ 11,406 | $ 9,999 | $ 6,815 | $ 25,123 | [1] | $ 18,338 | $ 11,120 | $ 10,574 | $ 38,954 | $ 65,155 | $ 44,915
Income tax provision (benefit), percent |  |  |  |  |  |  |  |  |  | 18.00% | 37.00% | 30.00%
[1] | During the fourth quarter of 2017, Columbia acquired Pacific Continental and also recorded a charge through provision for income taxes related to the re-measurement of our deferred tax assets pursuant to the newly enacted Tax Cuts and Jobs Act. See Note 2, “Business Combinations,” for further information regarding this acquisition. See Note 23, “Income Tax,” for further information regarding the re-measurement of our deferred tax assets.
[2] | During the third quarter of 2017, Columbia sold its merchant card services portfolio.

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