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Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal operating loss carryforwards, set to begin to expire in 2024 | $ 18,400 |  |  |  |  |  |  |  |  | $ 18,400 |  |  |
Idaho state operating loss carryforwards, set to begin to expire in 2024 | 27,600 |  |  |  |  |  |  |  |  | 27,600 |  |  |
Interest and penalties on unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 0 |  |  |
State operating loss carryforwards, set to begin to expire in 2024 | 170 |  |  |  |  |  |  |  |  | 170 |  |  |
Unrecognized tax position | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Federal tax credit carryforwards | 404 |  |  |  |  |  |  |  |  | 404 |  |  |
State tax credit carryforwards, set to expire in 2015 | 560 |  |  |  |  |  |  |  |  | 560 |  |  |
Current tax (benefit) expense |  |  |  |  |  |  |  |  |  | 43,069 | $ 36,426 |  | $ 21,565
Deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  | 1,846 | 6,367 |  | 14,646
Income tax provision | 12,317 | $ 12,124 | $ 11,245 | $ 9,229 | $ 10,598 |  | $ 11,515 | $ 9,853 | $ 10,827 | 44,915 | 42,793 |  | 36,211
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses | 26,638 |  |  |  | 26,024 |  |  |  |  | 26,638 | 26,024 |  |
Supplemental executive retirement plan | 16,232 |  |  |  | 14,716 | [1] |  |  |  | 16,232 | 14,716 | [1] |
Stock option and restricted stock | 1,922 |  |  |  | 1,423 |  |  |  |  | 1,922 | 1,423 |  |
OREO | 111 |  |  |  | 813 |  |  |  |  | 111 | 813 |  |
Nonaccrual interest | 320 |  |  |  | 69 |  |  |  |  | 320 | 69 |  |
Deferred tax assets, purchase accounting | 2,613 |  |  |  | 9,457 |  |  |  |  | 2,613 | 9,457 |  |
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 7,492 |  |  |  | 0 | [1] |  |  |  | 7,492 | 0 | [1] |
Deferred Tax Assets, Operating Loss Carryforwards | 8,597 |  |  |  | 11,467 |  |  |  |  | 8,597 | 11,467 |  |
Other | (851) |  |  |  | (180) |  |  |  |  | (851) | (180) |  |
Total deferred tax assets | 65,835 |  |  |  | 64,149 |  |  |  |  | 65,835 | 64,149 |  |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Asset purchase tax basis difference | (9,037) |  |  |  | (9,058) |  |  |  |  | (9,037) | (9,058) |  |
FHLB stock dividends | (1,232) |  |  |  | (1,232) |  |  |  |  | (1,232) | (1,232) |  |
Deferred loan fees | (5,126) |  |  |  | (5,202) |  |  |  |  | (5,126) | (5,202) |  |
deferred tax liabilities, unrealized gains on available-for-sale securities | 0 |  |  |  | 30 | [1] |  |  |  | 0 | 30 | [1] |
Depreciation | 0 |  |  |  | (3,730) |  |  |  |  | 0 | (3,730) |  |
Deferred Tax Liabilities, Other | (155) |  |  |  | 0 |  |  |  |  | (155) | 0 |  |
Total deferred tax liabilities | 15,550 |  |  |  | 19,252 |  |  |  |  | 15,550 | 19,252 |  |
Deferred Tax Assets, Property, Plant and Equipment | 1,059 |  |  |  | 0 |  |  |  |  | 1,059 | 0 |  |
Net deferred tax (liability) asset | 50,285 |  |  |  | 44,897 |  |  |  |  | 50,285 | 44,897 |  |
Reconciliation of effective income tax rate with federal statutory tax rate |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax based on statutory rate |  |  |  |  |  |  |  |  |  | $ 52,424 | $ 49,567 |  | $ 41,225
Income tax based on statutory rate, percent |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% |  | 35.00%
Tax exempt instrument |  |  |  |  |  |  |  |  |  | $ (7,433) | $ (6,761) |  | $ (5,328)
Tax exempt instrument, percent |  |  |  |  |  |  |  |  |  | (5.00%) | (5.00%) |  | (5.00%)
Life insurance proceeds |  |  |  |  |  |  |  |  |  | $ (1,680) | $ (1,554) |  | $ (1,352)
Life insurance proceeds, percent |  |  |  |  |  |  |  |  |  | (1.00%) | (1.00%) |  | (1.00%)
effective income tax rate reconciliation, nondeductible expense, business combination, amount |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 448
effective income tax rate reconciliation, nondeductible expense, business combination, percent |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  | 0.00%
Other, net |  |  |  |  |  |  |  |  |  | $ 1,604 | $ 1,541 |  | $ 1,218
Other, net, percent |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  | 2.00%
Income tax provision | $ 12,317 | $ 12,124 | $ 11,245 | $ 9,229 | $ 10,598 |  | $ 11,515 | $ 9,853 | $ 10,827 | $ 44,915 | $ 42,793 |  | $ 36,211
Income tax provision (benefit), percent |  |  |  |  |  |  |  |  |  | 30.00% | 30.00% |  | 31.00%
[1] | Reclassified to conform to the current period’s presentation.

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