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Fair Value Measurements - Summary of estimated fair values of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Assets:        
Cash and cash equivalents $ 61,806 $ 30,562 $ 43,077 $ 42,993
Securities available-for-sale 146,419 145,698    
Securities, restricted, at cost 2,665 2,583    
Loans, net 558,380 462,472    
Accrued interest receivable 3,242 3,855    
Financial Liabilities:        
Time deposits 19,746 20,417    
Secured borrowings 86 89    
Carrying Value        
Financial Assets:        
Cash and cash equivalents 61,806 30,562    
Securities available-for-sale 146,419 145,698    
Securities, restricted, at cost 2,665 2,583    
Loans, net 558,380 462,472    
Accrued interest receivable 3,242 3,855    
Financial Liabilities:        
Time deposits 19,746 20,417    
Demand and other deposits 660,874 548,004    
Secured borrowings 86 89    
Accrued interest payable 12 15    
Fair Value        
Financial Assets:        
Cash and cash equivalents 61,676 30,562    
Securities available-for-sale 146,419 145,698    
Loans, net 560,859 464,144    
Accrued interest receivable 3,242 3,855    
Financial Liabilities:        
Time deposits 19,763 20,377    
Demand and other deposits 660,874 548,004    
Secured borrowings 86 89    
Accrued interest payable 12 15    
Fair Value | (Level 1)        
Financial Assets:        
Cash and cash equivalents 669 659    
Securities available-for-sale 0 0    
Loans, net 0 0    
Accrued interest receivable 0 0    
Financial Liabilities:        
Time deposits 0 0    
Demand and other deposits 660,874 548,004    
Secured borrowings 0 0    
Accrued interest payable 0 0    
Fair Value | (Level 2)        
Financial Assets:        
Cash and cash equivalents 61,007 29,903    
Securities available-for-sale 146,419 145,698    
Loans, net 0 0    
Accrued interest receivable 386 368    
Financial Liabilities:        
Time deposits 19,763 20,377    
Demand and other deposits 0 0    
Secured borrowings 86 89    
Accrued interest payable 12 15    
Fair Value | (Level 3)        
Financial Assets:        
Cash and cash equivalents 0 0    
Securities available-for-sale 0 0    
Loans, net 560,859 464,144    
Accrued interest receivable 2,856 3,487    
Financial Liabilities:        
Time deposits 0 0    
Demand and other deposits 0 0    
Secured borrowings 0 0    
Accrued interest payable $ 0 $ 0