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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