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Loans and Asset Quality Information (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 01, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Total Covered Loans - Carrying Value   $ 99,523,000 $ 119,829,000 $ 102,641,000
Foreclosed real estate - covered   1,569,000 2,055,000 806,000
Nonaccrual loans   41,411,000   47,810,000
Accretion of loan discount   $ 1,055,000   4,751,000
Percentage of loan discount accretion   80.00%    
Payments that exceeded the initial carrying amount on purchased impaired loans   $ 69,000 0  
Contractual balance of nonaccrual loans   9,000,000 $ 14,100,000 12,300,000
Purchased Accruing Loans [Member]        
Loan discount on loans   12,489,000    
Purchased Nonaccruing Loans [Member]        
Loan discount on loans   1,546,000    
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Subsequent Event [Member]        
Total Covered Loans - Carrying Value $ 17,700,000      
Foreclosed real estate - covered 1,200,000      
Nonaccrual loans 2,800,000      
Transfer of allowance of loan losses from covered to non-covered 300,000      
Total loans transferred to non-covered status $ 17,700,000      
Residential mortgage loans [Member]        
Total Covered Loans - Carrying Value   73,611,000   $ 75,657,000
Nonaccrual loans in process of foreclosure   $ 2,100,000