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Subsequent Events (Unaudited) (Details)
$ / shares in Units, $ in Thousands
2 Months Ended
Mar. 01, 2016
USD ($)
office
$ / shares
shares
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Subsequent Event [Line Items]            
Assets     $ 2,373,701 $ 2,237,099 $ 2,163,827  
Equity     $ 252,348 $ 228,824 $ 200,097 $ 185,026
River Valley Bancorp | Subsequent Event            
Subsequent Event [Line Items]            
Number of offices | office 14          
Assets   $ 516,300        
Equity   $ 56,600        
Shares of common stock issued for acquisition (in shares) | shares 1,936,000          
Number of the Company's common stock for each share of RIVR converted | shares 0.77          
Cash portion, cash per share for RIVR common stock converted (USD per share) | $ / shares $ 9.90          
Business Combination, Consideration Transferred [Abstract]            
Cash for Options and Fractional Shares $ 395          
Cash Consideration 24,975          
Equity Instruments 62,022          
Fair Value of Total Consideration Transferred $ 87,392