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Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of the provision for deferred income taxes
Provision for loan losses	$ 2,480	$ 3,146	$ 5,511
Deferred compensation	97	1	(109)
Amortization of core deposit intangible assets	230	(203)	(691)
Stock option expense	(151)	(80)	202
OREO write downs	1,722	1,402	6,591
Federal net operating loss carryforward	2,896	1,022	(7,287)
State net operating loss carryforward	659	2,442	(1,661)
Deferred tax credit	(198)	(107)
Depreciation	(201)	(233)	(28)
Net premiums and discounts on securities		(8)	(114)
Mortgage servicing rights	164	(251)	752
Goodwill amortization/impairment	1,506	2,123	1,544
State tax benefits	(604)	(1,704)	(321)
Change in valuation allowance		(2,363)	(74,145)
Other, net	156	446	(620)
Total deferred tax benefit	8,756	5,633	(70,376)
Difference between effective tax rates and federal statutory rates applied to financial statement income
Tax at statutory federal income tax rate	8,526	5,564	4,145
Nontaxable interest income, net of disallowed interest deduction	(253)	(233)	(245)
BOLI income	(487)	(508)	(694)
State income taxes, net of federal benefit	1,126	872	662
Change in valuation allowance		(2,363)	(74,145)
Deficiency from restricted stock			10
Impact of Illinois tax rate change		2,363
Other, net	64	66	25
Provision for income taxes	8,976	5,761	(70,242)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 24,361	$ 15,897	$ 11,843

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deferred compensation.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to depreciation.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to goodwill.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to intangible assets other than goodwill.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to mortgage servicing rights.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deductible domestic operating loss carryforwards, excluding state and local operating loss carryforwards.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deductible state and local operating loss carryforwards.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) not separately disclosed.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to wrote downs on other real estate owned.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to net premiums and discounts on securities.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to provision for loan losses.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to share based compensation.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to state tax benefits.

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The component of deferred income tax expense (benefit) for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deferred tax credits.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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.

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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 income tax rates.

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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 nondeductible life insurance expense.

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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 nondeductible equity-based compensation costs.

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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 other adjustments.

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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 income (loss) exempt from income taxes.

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