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Accounting for Certain Loans Acquired in a Transfer (Schedule of Acquired Loans) (Details) - USD ($)
Dec. 31, 2018
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2016
Total loans receivable $ 1,497,256,000   $ 1,186,713,000 $ 1,172,636,000
Acquired loans with evidence of deterioration, fair value   $ 313,000    
Universal Bancorp [Member]        
Total loans receivable 179,968,000      
Carrying amount, gross 177,169,000      
Allowance (177,169,000)      
Carrying amount net of allowance 177,169,000      
Commercial Real Estate [Member]        
Total loans receivable 485,808,000   318,684,000  
Real estate [Member]        
Total loans receivable 1,080,729,000   860,568,000  
Real estate [Member] | Universal Bancorp [Member]        
Total loans receivable 167,639,000      
Real estate [Member] | Commercial Real Estate [Member]        
Total loans receivable 485,808,000   318,684,000  
Real estate [Member] | Commercial Real Estate [Member] | Universal Bancorp [Member]        
Total loans receivable 120,249,000      
Other [Member]        
Total loans receivable 416,527,000   326,145,000  
Other [Member] | Universal Bancorp [Member]        
Total loans receivable 12,329,000      
Construction Loans [Member] | Commercial Segment [Member]        
Total loans receivable 53,310,000   28,164,000  
Construction Loans [Member] | Real estate [Member] | Commercial Segment [Member]        
Total loans receivable 53,310,000   28,164,000  
Construction Loans [Member] | Real estate [Member] | Commercial Segment [Member] | Universal Bancorp [Member]        
Total loans receivable 8,664,000      
First Mortgage [Member] | Consumer [Member]        
Total loans receivable 464,539,000   444,243,000  
First Mortgage [Member] | Real estate [Member] | Consumer [Member]        
Total loans receivable 464,539,000   444,243,000  
First Mortgage [Member] | Real estate [Member] | Consumer [Member] | Universal Bancorp [Member]        
Total loans receivable 30,694,000      
Second Mortgage [Member] | Consumer [Member]        
Total loans receivable 77,072,000   69,477,000  
Second Mortgage [Member] | Real estate [Member] | Consumer [Member]        
Total loans receivable 77,072,000   69,477,000  
Second Mortgage [Member] | Real estate [Member] | Consumer [Member] | Universal Bancorp [Member]        
Total loans receivable 8,032,000      
Automobile Loan [Member] | Consumer [Member]        
Total loans receivable 43,667,000   19,640,000  
Automobile Loan [Member] | Other [Member] | Consumer [Member]        
Total loans receivable 43,667,000   19,640,000  
Automobile Loan [Member] | Other [Member] | Consumer [Member] | Universal Bancorp [Member]        
Total loans receivable 1,138,000      
Boat/RVs [Member] | Consumer [Member]        
Total loans receivable 216,608,000   169,238,000  
Boat/RVs [Member] | Other [Member] | Consumer [Member]        
Total loans receivable 216,608,000   169,238,000  
Boat/RVs [Member] | Other [Member] | Consumer [Member] | Universal Bancorp [Member]        
Total loans receivable 97,000      
Other [Member] | Consumer [Member]        
Total loans receivable 6,893,000   6,188,000  
Other [Member] | Other [Member] | Consumer [Member]        
Total loans receivable 6,893,000   6,188,000  
Other [Member] | Other [Member] | Consumer [Member] | Universal Bancorp [Member]        
Total loans receivable 523,000      
Commercial and Industrial [Member] | Commercial Segment [Member]        
Total loans receivable 149,359,000   131,079,000  
Commercial and Industrial [Member] | Other [Member] | Commercial Segment [Member]        
Total loans receivable 149,359,000   $ 131,079,000  
Commercial and Industrial [Member] | Other [Member] | Commercial Segment [Member] | Universal Bancorp [Member]        
Total loans receivable $ 10,571,000