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Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of the provision for deferred income taxes      
Provision for loan losses $ (426) $ 1,680 $ 42
Deferred compensation (15) 85 (45)
Amortization of core deposit intangible 957 574 228
Stock option compensation (511) 80 (132)
Business combination adjustments 927    
OREO write downs 48 2,725 1,807
Federal net operating loss carryforward 5,041 12,122 4,743
State net operating loss carryforward 2,986 715 1,011
Deferred tax credit   2,058 (309)
Depreciation 59 (297) 80
Mortgage servicing rights 124 (674) 276
Goodwill amortization/impairment 1,389 4,040 1,496
State tax benefits (550) (1,738) (559)
Other, net (189) 201 (217)
Total deferred tax benefit 9,840 21,571 8,421
Difference between effective tax rates and federal statutory rates applied to financial statement income      
Tax at statutory federal income tax rate 9,227 11,817 8,577
Nontaxable interest income, net of disallowed interest deduction (1,600) (1,976) (347)
BOLI Income (422) (501) (449)
State income taxes, net of federal benefit 2,927 1,775 1,148
Stock based compensation (305)    
Impact of Federal tax rate change   9,475  
Impact of Illinois tax rate change   (1,566)  
Other, net 97 140 (109)
Total income tax expenses 9,924 19,164 8,820
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 43,936 $ 34,302 $ 24,504