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Income Taxes - Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of income tax expense (benefit)      
Current federal $ 4,815   $ (2,407)
Current state 1,151 $ 84  
Deferred federal 3,177 6,226 11,724
Deferred state 3,259 3,614 1,938
Recovery due to State of Illinois tax rate change     (1,566)
Expense due to enactment of federal tax reform     9,475
Total income tax expenses 12,402 9,924 $ 19,164
Deferred tax assets      
Allowance for loan losses 6,082 5,803  
Deferred compensation 907 665  
Goodwill amortization/impairment 3,456 4,698  
Stock based compensation 1,622 1,377  
Business combination adjustments 1,547 2,532  
OREO write downs 1,931 2,337  
Federal net operating loss ("NOL") carryforward 340 2,199  
State net operating loss ("NOL") carryforward 326 4,034  
Other assets 2,270 1,401  
Total deferred tax assets 18,481 25,046  
Deferred tax liabilities      
Accumulated depreciation on premises and equipment (746) (443)  
Mortgage servicing rights (1,779) (2,210)  
Amortization of core deposit intangible (144) (130)  
State tax benefits (927) (1,839)  
Other liabilities (1,637) (741)  
Total deferred tax liabilities (5,233) (5,363)  
Net deferred tax asset before valuation allowance 13,248 19,683  
Tax effect of adjustments related to other comprehensive loss (1,789) 1,597  
Net deferred tax asset $ 11,459 $ 21,280  
Corporate federal tax rate 21.00% 35.00%