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Mergers and Acquisitions (Narrative) (Detail) - USD ($)
 3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Mar. 01, 2015
Feb. 27, 2015
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]                            
Goodwill     $ 3,918,000   $ 3,918,000       $ 3,918,000   $ 3,918,000 $ 3,918,000 $ 3,918,000  
Net Income (Loss) Attributable to Parent     $ 2,345,000 $ 2,022,000 $ 1,627,000 $ 1,894,000 $ 2,044,000 $ 963,000 $ 4,339,000 $ 3,827,000   $ 7,804,000 6,528,000 $ 5,701,000
Series C Preferred Stock [Member]                            
Business Acquisition [Line Items]                            
Preferred Stock, Shares Issued 1,750                          
Preferred Stock, Liquidation Preference Per Share $ 1,000                          
Phoenix Bancorp Inc. [Member]                            
Business Acquisition [Line Items]                            
Ratio of conversion of acquiree's shares to entity's shares 3.167%                          
Per share price $ 51.60 $ 15.60                        
Shares Of Acquirer Ratio Of Common Stock 0.414%                          
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 $ 5,259,000
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 $ 86,000                          
Finite-Lived Intangible Assets, Amortization Expense, Year Two 75,000                          
Finite-Lived Intangible Assets, Amortization Expense, Year Three 65,000                          
Finite-Lived Intangible Assets, Amortization Expense, Year Four 54,000                          
Finite-Lived Intangible Assets, Amortization Expense, Year Five 44,000                          
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 70,000                          
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