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Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of the provision for deferred income taxes      
Provision for loan losses $ 42 $ 2,480 $ 3,146
Deferred compensation (45) 97 1
Amortization of core deposit intangible assets 228 230 (203)
Stock option expense (132) (151) (80)
OREO write downs 1,807 1,722 1,402
Federal net operating loss carryforward 4,743 2,896 1,022
State net operating loss carryforward 1,011 659 2,442
Deferred tax credit (309) (198) (107)
Depreciation 80 (201) (233)
Net premiums and discounts on securities     (8)
Mortgage servicing rights 276 164 (251)
Goodwill amortization/impairment 1,496 1,506 2,123
State tax benefits (559) (604) (1,704)
Change in valuation allowance     (2,363)
Other, net (217) 156 446
Total deferred tax benefit 8,421 8,756 5,633
Difference between effective tax rates and federal statutory rates applied to financial statement income      
Tax at statutory federal income tax rate 8,577 8,526 5,564
Nontaxable interest income, net of disallowed interest deduction (347) (253) (233)
BOLI Income (449) (487) (508)
State income taxes, net of federal benefit 1,148 1,126 872
Change in valuation allowance     (2,363)
Impact of Illinois tax rate change     2,363
Other, net (109) 64 66
Provision for income taxes 8,820 8,976 5,761
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 24,504 $ 24,361 $ 15,897