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Income Taxes - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of income tax expense (benefit) |  |  |
Current federal | $ 399 | $ 220 | $ 122
Current state |  |  | 6
Deferred federal | 6,824 | 7,023 | 3,120
Deferred state | 1,597 | 1,733 | 4,876
Change in valuation allowance |  |  | (2,363)
Provision for income taxes | 8,820 | 8,976 | $ 5,761
Deferred tax assets |  |  |
Allowance for loan losses | 7,057 | 7,099 |
Deferred compensation | 735 | 690 |
Amortization of core deposit | 1,401 | 1,629 |
Goodwill amortization/impairment | 10,127 | 11,623 |
Stock option expense | 946 | 814 |
OREO write downs | 5,110 | 6,917 |
Federal net operating loss ("NOL") carryforward | 19,362 | 24,105 |
State net operating loss ("NOL") carryforward | 7,735 | 8,746 |
Deferred tax credit | 2,058 | 1,749 |
Other assets | 1,199 | 792 |
Total deferred tax assets | 55,730 | 64,164 |
Deferred tax liabilities |  |  |
Accumulated depreciation on premises and equipment | (681) | (601) |
Mortgage servicing rights | (2,760) | (2,484) |
State tax benefits | (4,127) | (4,686) |
Other liabilities | (526) | (336) |
Total deferred tax liabilities | (8,094) | (8,107) |
Net deferred tax asset before valuation allowance | 47,636 | 56,057 |
Tax effect of adjustments related to other comprehensive loss | 5,828 | 8,495 |
Net deferred tax asset | $ 53,464 | $ 64,552 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
Name: | us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration