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Acquisitions - First Community Financial Partners, Inc. (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2017
USD ($)
item
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Consideration paid:                
Goodwill       $ 267,685   $ 269,346    
Portfolio Loans, allowance for loan losses (in dollars)   $ 51,035 $ 49,201 52,743 $ 51,035 53,582 $ 53,305 $ 47,795
First Community                
Business Acquisition                
Number of banking centers | item 9              
Share consideration conversion ratio 0.396              
Per share cash consideration entitled (in dollars per share) | $ / shares $ 1.35              
Number of common shares issued for acquisition | shares     7.2          
Market value of common stock issued     $ 211,100          
Share price | $ / shares     $ 29.32          
Options to purchase common stock, conversion ratio 0.44              
Assets acquired:                
Cash and cash equivalents $ 60,686              
Securities 165,843              
Loans held for sale 905              
Portfolio loans 1,096,583              
Premises and equipment 18,094              
OREO 722              
Other intangible assets 13,979              
Other assets 41,755              
Total assets acquired 1,398,567              
Liabilities assumed:                
Deposits 1,134,355              
Other borrowings 125,751              
Other liabilities 11,862              
Total liabilities assumed 1,271,968              
Net assets acquired 126,599              
Consideration paid:                
Cash 24,557              
Cash payout of options and restricted stock units 6,182              
Common stock 211,120              
Fair value of stock options assumed 722              
Total consideration paid 242,581              
Goodwill 115,982              
Fair value of performing loans, including loans held for sale 1,100,000              
Amount expected to be accreted, gross $ 14,400              
Estimated remaining life for loans expected to be accreted (in years) 4 years              
Contractual amount of PCI loans $ 17,900              
Fair value of credit-impaired loans 12,500              
PCI loan outstanding amount       2,700        
Accretable yield expected to be recognized over the estimated period 600              
Amount accelerated as a result of collections of PCI loan balances           $ 200    
Total revenues (net interest income plus non-interest income)         231,301      
Net income         $ 56,348      
Diluted earnings per common share (in dollars per share) | $ / shares         $ 1.23      
Portfolio Loans, allowance for loan losses (in dollars) $ 0              
First Community | Non-interest expense                
Business Acquisition                
Business acquisition expenses   $ 2,900   $ 100 $ 3,700