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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating losses and tax credits | $ 42,062 | $ 61,906
Interest on non-accrual loans | 2,755 | 2,882
Allowance for loan losses and loan basis | 13,839 | 22,017
Deposits | 5 | 316
Alternative minimum tax ("AMT") credit carryforward | 2,140 | 1,073
Other real estate owned |  | 214
Net unrealized holding losses on securities available-for-sale | 2,766 | 4,818
Other | 2,413 | 3,241
Total deferred tax assets | 65,980 | 96,467
Deferred tax liabilities: |  |
Other real estate owned | (24) |
Premises and equipment | (3,385) | (6,907)
Core deposit intangibles | (4,656) | (7,858)
Servicing assets | (3,505) | (7,899)
Trust preferred securities | (2,465) | (3,809)
Unrealized holding gain on cash flow hedges | (1,390) | (1,491)
Other | (592) | (743)
Total deferred tax liabilities | (16,017) | (28,707)
Net deferred tax assets after valuation allowance | $ 49,963 | $ 67,760

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