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Mergers and Acquisitions (Narrative) (Details) - USD ($)
 10 Months Ended 12 Months Ended
Jan. 16, 2018
Jan. 08, 2018
Mar. 01, 2015
Feb. 27, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                
Goodwill           $ 3,918,000 $ 3,918,000  
Net Income (Loss) Attributable to Parent           $ 7,089,000 $ 7,804,000 $ 6,528,000
Series C Preferred Stock [Member]                
Business Acquisition [Line Items]                
Preferred Stock, Shares Issued     1,750          
Preferred Stock, Liquidation Preference Per Share     $ 1,000          
Scottdale Bank and Trust Company [Member] | Subsequent Event [Member]                
Business Acquisition [Line Items]                
Date of acquisition   Jan. 08, 2018            
Plan of merger agreement, date   Mar. 29, 2017            
Per share price   $ 1,166            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   1,900,000            
Payments to Acquire Businesses, Gross   $ 2,800,000            
Business Combination, Consideration Transferred   $ 66,972,000            
First Priority Financial Corp. [Member] | Subsequent Event [Member]                
Business Acquisition [Line Items]                
Plan of merger agreement, date Jan. 16, 2018              
Shares Of Acquirer Ratio Of Common Stock 34.81%              
Phoenix Bancorp Inc. [Member]                
Business Acquisition [Line Items]                
Ratio of conversion of acquiree's shares to entity's shares     316.70%          
Per share price     $ 51.60 $ 15.60        
Shares Of Acquirer Ratio Of Common Stock     41.40%          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares     723,851          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 11,292,000          
Payments to Acquire Businesses, Gross     2,949,000 $ 2,949,000        
Business Combination, Consideration Transferred     $ 14,241,000          
Preferred Stock, Shares Issued     1,750          
Goodwill     $ 2,902,000          
Business Combination, Acquired Receivables, Fair Value     112,816,000          
Pro Forma Earnings               5,811,000
Revenues         $ 4,244,000      
Net Income (Loss) Attributable to Parent         $ 747,000      
Phoenix Bancorp Inc. [Member] | Acquisition-related Costs [Member]                
Business Acquisition [Line Items]                
Pro Forma Earnings               $ 762,000
Phoenix Bancorp Inc. [Member] | Core Deposits [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired     $ 578,000          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years          
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     $ 75,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Two     65,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Three     54,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Four     44,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Five     33,000          
Finite-Lived Intangible Assets, Amortization Expense, after Year Five     $ 37,000          
Phoenix Bancorp Inc. [Member] | Series C Preferred Stock [Member]                
Business Acquisition [Line Items]                
Preferred Stock, Shares Issued     1,750          
Preferred Stock, Liquidation Preference Per Share     $ 1,000