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Loans and Asset Quality Information (Narrative) (Details)
 12 Months Ended
Jul. 02, 2014
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Number of loss share agreements expired | item 1      
Total Covered Loans - Carrying Value   $ 102,641,000 $ 127,594,000  
Foreclosed real estate - covered   806,000 2,350,000  
Nonaccrual loans   47,810,000 60,574,000  
Transfers to non-covered loans due to expiration of loss-share agreement     (38,987,000)  
Loans pledged as collateral   2,000,000,000 1,900,000,000  
Loans to officers and directors   3,400,000 3,800,000  
Additions to loans, officers and directors   900,000    
Repayments of loans, officers and directors   1,300,000    
Accretion of loan discount   $ 4,751,000 16,009,000  
Percentage of loan discount accretion   80.00%    
Payments that exceeded the initial carrying amount on purchased impaired loans   $ 436,000 179,000  
Contractual balance of nonaccrual loans   12,300,000 16,000,000  
Restructured Loans [Member]        
Interest Income   2,044,000 3,045,000 $ 2,674,000
Interest income, actually collected   1,392,000 2,003,000 1,681,000
Nonaccrual Loans [Member]        
Interest Income   3,213,000 4,115,000 5,262,000
Interest income, actually collected   575,000 1,176,000 $ 1,414,000
Special Mention Loans (Grade 5) [Member]        
Total Covered Loans - Carrying Value   7,423,000 10,503,000  
Classified [Member]        
Total Covered Loans - Carrying Value   16,004,000 20,613,000  
Nonaccrual Loans [Member]        
Total Covered Loans - Carrying Value   7,816,000 10,508,000  
Purchased Nonimpaired Loans [Member]        
Loan discount on loans   13,086,000    
Purchased Nonperfoming Loans [Member]        
Loan discount on loans   2,174,000    
Non-covered [Member]        
Nonaccrual loans   39,994,000 50,066,000  
Covered Loss Sharing Subsequent Change to Noncovered [Member]        
Total Covered Loans - Carrying Value $ 39,700,000      
Foreclosed real estate - covered 3,000,000      
Nonaccrual loans 9,700,000      
Restructured loans - accruing 2,100,000      
Transfer of allowance of loan losses from covered to non-covered 1,700,000      
Total loans transferred to non-covered status 39,700,000      
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Special Mention Loans (Grade 5) [Member]        
Total Covered Loans - Carrying Value 2,800,000      
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Classified [Member]        
Total Covered Loans - Carrying Value 5,500,000      
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Nonaccrual Loans [Member]        
Total Covered Loans - Carrying Value $ 9,700,000      
Residential mortgage loans [Member]        
Total Covered Loans - Carrying Value   75,657,000 89,770,000  
Nonaccrual loans in process of foreclosure   $ 2,500,000 $ 6,100,000