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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of components of provision for income taxes | The following were the components of provision for income taxes for the years ended December 31, 2017, 2016, and 2015:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current tax expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 1,010 |  |  | $ | — |  |  | $ | 250 |
State and local |  |  | 1,485 |  |  |  | — |  |  |  | 57 |
Total current tax expense |  |  | 2,495 |  |  |  | — |  |  |  | 307 |
Deferred tax expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 13,554 |  |  |  | 478 |  |  |  | 4,929 |
State and local |  |  | 686 |  |  |  | 136 |  |  |  | 656 |
Remeasurement of net deferred tax assets |  |  | 2,364 |  |  |  | — |  |  |  | — |
Total deferred tax expense before reversal of valuation allowance |  |  | 16,604 |  |  |  | 614 |  |  |  | 5,585 |
Deferred tax valuation allowance |  |  | — |  |  |  | (61,859 | ) |  |  | (5,585 | )
Provision (benefit) for income taxes |  | $ | 19,099 |  |  | $ | (61,245 | ) |  | $ | 307 |
Schedule of reconciliation between statutory U.S. federal income tax rate and effective tax rate | The following is a reconciliation between the statutory U.S. federal income tax rate of 35% and the effective tax rate:
|  | 2017 |  |  | 2016 |  |  | 2015 |  |
Calculated tax benefit at statutory rate |  |  | 35.0 |  | % |  | 35.0 |  | % |  | 35.0 |  | %
Increase (decrease) in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of valuation allowance, net of change in estimated Section 382 impact |  |  | — |  |  |  | (1,167.6 | ) |  |  | 73.4 |  |
State taxes, net of federal income tax |  |  | 6.5 |  |  |  | 6.1 |  |  |  | 5.0 |  |
Tax exempt income |  |  | (0.7 | ) |  |  | (5.3 | ) |  |  | 24.2 |  |
Non-deductible expenses |  |  | 0.2 |  |  |  | 14.8 |  |  |  | (137.6 | ) |
Remeasurement of net deferred tax assets |  |  | 5.8 |  |  |  | — |  |  |  | — |  |
Total income tax expense (benefit) |  |  | 46.8 |  | % |  | (1,117.0 | ) | % |  | — |  | %
Schedule of components of deferred tax assets and liabilities | The following were the significant components of the deferred tax assets and liabilities as of December 31, 2017 and 2016:
|  | 2017 |  |  | 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 | )
Less valuation allowance on net deferred tax asset |  |  | — |  |  |  | — |
Net deferred tax assets after valuation allowance |  | $ | 49,963 |  |  | $ | 67,760 |
Operating Loss and Credit Carryforwards |
|  | 2017 |  |  | 2016 |
NOL carryforwards available to offset future taxable income: |  |  |  |  |  |  |  |
Federal gross NOL carryforwards - begin to expire in 2027 |  | $ | 63,964 |  |  | $ | 116,315 |
Illinois gross NLD carryforwards - begin to expire in 2021 |  |  | 381,471 |  |  |  | 420,764 |
AMT credit carryforward - no expiration date |  |  | 2,140 |  |  |  | 1,073 |

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