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Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of the provision for deferred income taxes      
Provision for loan losses $ 1,680 $ 42 $ 2,480
Deferred compensation 85 (45) 97
Amortization of core deposit intangible assets 574 228 230
Stock option expense 80 (132) (151)
OREO write downs 2,725 1,807 1,722
Federal net operating loss carryforward 12,122 4,743 2,896
State net operating loss carryforward 715 1,011 659
Deferred tax credit 2,058 (309) (198)
Depreciation (297) 80 (201)
Mortgage servicing rights (674) 276 164
Goodwill amortization/impairment 4,040 1,496 1,506
State tax benefits (1,738) (559) (604)
Other, net 201 (217) 156
Total deferred tax benefit 21,571 8,421 8,756
Difference between effective tax rates and federal statutory rates applied to financial statement income      
Tax at statutory federal income tax rate 11,817 8,577 8,526
Nontaxable interest income, net of disallowed interest deduction (1,976) (347) (253)
BOLI Income (501) (449) (487)
Impact of Federal tax rate change 9,475    
State income taxes, net of federal benefit 1,775 1,148 1,126
Impact of Illinois tax rate change (1,566)    
Other, net 140 (109) 64
Provision for income taxes 19,164 8,820 8,976
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 34,302 $ 24,504 $ 24,361