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Acquisitions - The Banc Ed Corp. (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Mar. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
$ / shares
shares
Jul. 02, 2017
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Merger agreement            
Per share cash consideration entitled (in dollars per share) | $ / shares     $ 1.35      
(Decrease) increase in other liabilities       $ (7,380) $ 2,195 $ (4,193)
Consideration paid            
Goodwill       311,536 267,685  
Banc Ed            
Merger agreement            
Share consideration conversion ratio   8.2067        
Per share cash consideration entitled (in dollars per share) | $ / shares   $ 111.53        
Number of common shares issued for acquisition | shares   6.7        
Market value of common stock issued   $ 166,500        
Adjustments to the fair value assigned to various assets and liabilities $ 5,200          
Common stock   $ 166,515        
Share price | $ / shares   $ 24.76        
Reversal of a deferred tax liability       4,600    
Transaction costs       2,300    
Assets acquired:            
Cash and cash equivalents   $ 42,013        
Securities   692,716        
Loans held for sale   2,157        
Portfolio loans   873,336        
Premises and equipment   32,156        
Other intangible assets   32,617        
Mortgage servicing rights   6,946        
Other assets   57,332        
Total assets acquired   1,739,273        
Liabilities assumed:            
Deposits   1,439,203        
Other borrowings   63,439        
Other liabilities   20,153        
Total liabilities assumed   1,522,795        
Net assets acquired   216,478        
Consideration paid            
Cash   91,400        
Common stock   166,515        
Total consideration paid   257,915        
Goodwill   41,437        
Aggregate principal outstanding   889,300        
Fair value of performing loans, including loans held for sale   871,000        
Amount expected to be accreted, gross   17,000        
Contractual amount of PCI loans   3,900        
Accretable discount on PCI loans   200        
Fair value of credit-impaired loans   $ 2,300   1,300    
Banc Ed | Pro Forma            
Consideration paid            
Total revenues (net interest income plus non-interest income)       409,324,000 411,633,000  
Net income       $ 113,640,000 $ 118,361,000  
Diluted earnings per common share (in dollars per share) | $ / shares       $ 2.03 $ 2.15  
Banc Ed | Non-interest expense            
Merger agreement            
Business acquisition expenses       $ 13,700 $ 400  
IST | Non-interest expense            
Merger agreement            
Business acquisition expenses       $ 900