Parent Only Financial Information Parent Only Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
ASSETS        
Interest-Bearing Deposits at Banks $ 16,252 $ 11,214    
Available-for-sale Securities 402,309 366,139    
Held-to-Maturity Securities 320,611 302,024    
Other Assets 53,027 46,297    
Total Assets 2,446,188 2,217,420    
LIABILITIES        
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000    
Other Liabilities 21,621 23,125    
Total Liabilities 2,232,217 2,016,494    
Equity [Abstract]        
Stockholders' Equity Attributable to Parent 213,971 200,926 $ 192,154 $ 175,825
Total Liabilities and Stockholders' Equity 2,446,188 2,217,420    
Parent Company [Member]        
ASSETS        
Interest-Bearing Deposits at Banks 3,441 3,013    
Available-for-sale Securities 1,232 1,254    
Held-to-Maturity Securities 1,000 1,000    
Equity Method Investments 225,934 214,813    
Other Assets 7,390 6,538    
Total Assets 238,997 226,618    
LIABILITIES        
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000    
Other Liabilities 5,026 5,692    
Total Liabilities 25,026 25,692    
Equity [Abstract]        
Stockholders' Equity Attributable to Parent 213,971 200,926    
Total Liabilities and Stockholders' Equity $ 238,997 $ 226,618