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Loans and Asset Quality Information (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 02, 2016
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Total Covered Loans - Carrying Value   $ 78,387,000 $ 78,387,000 $ 102,641,000 $ 113,824,000
Foreclosed real estate - covered   385,000 385,000 806,000 1,945,000
Nonaccrual loans   37,975,000 37,975,000 47,810,000  
Unamortized premiums on loans   $ 1,074,000 1,074,000 873,000 819,000
Accretion of loan discount     $ 1,908,000 4,751,000  
Percentage of loan discount accretion   80.00% 80.00%    
Contractual balance of nonaccrual loans   $ 5,000,000 $ 5,000,000 12,300,000 12,700,000
Classified loans transferred to non-covered category upon expiration of FDIC loss share agreement   3,800,000 3,800,000    
Minimum [Member]          
Grading system for consumer loans     500,000    
Purchased Impaired Loans [Member]          
Accretion of loan discount   741,000 780,000    
Payments that exceeded the initial carrying amount on purchased impaired loans   1,062,000 1,108,000    
Additional loan interest income   321,000 328,000    
Non-Covered Purchased Nonimpaired Loans [Member]          
Accretion of loan discount     43,000    
Remaining loan discount for non-covered purchased nonaccruing loans   391,000 391,000    
Purchased Covered Nonimpaired Loans [Member]          
Accretion of loan discount     1,908,000 4,751,000  
Remaining loan discount for covered purchased accruing loans   11,179,000 11,179,000    
Remaining loan discount for covered purchased nonaccruing loans   581,000 581,000    
Non-covered [Member]          
Nonaccrual loans   33,781,000 33,781,000 39,994,000  
Unamortized premiums on loans   1,074,000 1,074,000 873,000 819,000
Consumer loans moved from "special mention" to "pass"   25,400,000 25,400,000    
Reclassification of perfoming loans to FDIC loss-share provisions   17,700,000 17,700,000    
Covered [Member]          
Total Covered Loans - Carrying Value   78,387,000 78,387,000 102,641,000 113,824,000
Nonaccrual loans   4,194,000 4,194,000 7,816,000  
Consumer loans moved from "special mention" to "pass"   4,300,000 4,300,000    
Real estate mortgage residential (1-4 family) first mortgages [Member]          
Total Covered Loans - Carrying Value   68,079,000 68,079,000 $ 75,657,000  
Nonaccrual loans in process of foreclosure   $ 1,800,000 $ 1,800,000   $ 5,100,000
Covered Loss Sharing Protection Change [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