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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
Loans in the formal process of foreclosure $ 1,529,000 $ 564,000  
Number of loans modified | contract 3 9 3
Pre-Modification Outstanding Recorded Investment $ 1,716,000 $ 657,000  
Post-Modification Outstanding Recorded Investment 1,366,000 657,000  
Recorded Investment 207,000 538,000  
Number of defaults on loans restructured 1 2  
Loans modified as troubled debt restructuring 43,000 166,000  
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk $ 1,909,000 $ 2,861,000 $ 2,933,000
Commercial      
Number of loans modified | contract 1 1  
Pre-Modification Outstanding Recorded Investment $ 1,500,000 $ 98,000  
Post-Modification Outstanding Recorded Investment 1,150,000 $ 98,000  
Recorded Investment 1,150,000    
Real estate Commercial      
Number of loans modified | contract   1  
Pre-Modification Outstanding Recorded Investment $ 216,000 $ 58,000  
Post-Modification Outstanding Recorded Investment   58,000  
Recorded Investment   $ 54,000  
Real estate Residential      
Number of loans modified | contract 2 7  
Pre-Modification Outstanding Recorded Investment   $ 501,000  
Post-Modification Outstanding Recorded Investment $ 216,000 501,000  
Recorded Investment $ 207,000 $ 484,000