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Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of the provision for deferred income taxes      
Provision for loan losses $ (279) $ (426) $ 1,680
Deferred compensation (242) (15) 85
Amortization of core deposit intangible 14 957 574
Stock option compensation (245) (511) 80
Business combination adjustments 985 927  
OREO write downs 406 48 2,725
Federal net operating loss carryforward 1,859 5,041 12,122
State net operating loss carryforward 3,708 2,986 715
Deferred tax credit     2,058
Depreciation 303 59 (297)
Mortgage servicing rights (431) 124 (674)
Goodwill amortization/impairment 1,242 1,389 4,040
State tax benefits (912) (550) (1,738)
Other, net 28 (189) 201
Total deferred tax benefit 6,436 9,840 21,571
Difference between effective tax rates and federal statutory rates applied to financial statement income      
Tax at statutory federal income tax rate 10,890 9,227 11,817
Nontaxable interest income, net of disallowed interest deduction (1,409) (1,600) (1,976)
BOLI Income (480) (422) (501)
State income taxes, net of federal benefit 3,496 2,927 1,775
Stock based compensation (207) (305)  
Impact of Federal tax rate change     9,475
Impact of Illinois tax rate change     (1,566)
Other, net 112 97 140
Total income tax expenses 12,402 9,924 19,164
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 51,857 $ 43,936 $ 34,302