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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2016
USD ($)
office
shares
Feb. 29, 2016
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
Sep. 30, 2016
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                
Assets         $ 3,144,360 $ 2,955,994 $ 2,373,701  
Equity         364,571 330,267 252,348 $ 228,824
Goodwill         54,058 54,058 20,536 $ 20,536
Amortization of expense intangible assets         942 1,062 790  
Core Banking                
Business Acquisition [Line Items]                
Goodwill         52,726 52,726 19,204  
Insurance                
Business Acquisition [Line Items]                
Goodwill         $ 1,332 $ 1,332 $ 1,332  
River Valley Bancorp                
Business Acquisition [Line Items]                
Assets   $ 516,300            
Equity   $ 56,600            
Direct acquisition costs $ 4,300              
Goodwill 33,522              
Intangible assets $ 2,613              
Shares of common stock issued for acquisition (in shares) | shares 1,942,000              
Number of the Company's common stock for each share of RIVR converted (in shares) | shares 0.770              
Cash portion, cash per share for RIVR common stock converted (USD per share) | $ / shares   $ 9.90            
Cash consideration $ 24,975 $ 24,975            
Cash for options and fractional shares 395 $ 395            
Fair value of non-impaired loans and customers receivables acquired 309,000              
Unpaid principal balance non-impaired loans and customers receivables acquired $ 316,400              
River Valley Bancorp | Core Deposit Intangible                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful live       8 years        
River Valley Bancorp | INDIANA                
Business Acquisition [Line Items]                
Number of banking offices | office 14              
River Valley Bancorp | KENTUCKY                
Business Acquisition [Line Items]                
Number of banking offices | office 1              
Insurance Agency, Madison, Indiana | INDIANA | German American Insurance, Inc. | Affiliated Entity                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful live     7 years          
Cash consideration     $ 209          
Insurance Agency, Madison, Indiana | INDIANA | German American Insurance, Inc. | Customer Relationships | Affiliated Entity                
Business Acquisition [Line Items]                
Intangible assets     $ 209