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Mergers and Acquisitions (Estimated Fair Value of Assets Acquired) (Detail) - USD ($)
Mar. 01, 2015
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Net assets acquired:        
Goodwill   $ 3,918,000 $ 3,918,000 $ 3,918,000
Phoenix Bancorp Inc. [Member]        
Business Acquisition [Line Items]        
Total purchase price $ 14,241,000      
Net assets acquired:        
Cash and cash equivalents 11,044,000      
Investment securities 11,331,000      
Restricted stock 509,000      
Loans 110,363,000      
Bank owned life insurance 3,673,000      
Premises and equipment 1,792,000      
Deferred income taxes 503,000      
Accrued interest receivable 388,000      
Core deposit and other intangibles 578,000      
Other assets 624,000      
Deposits (123,238,000)      
FHLB borrowings (3,570,000)      
Accrued interest payable (32,000)      
Other liabilities (876,000)      
Preferred stock (1,750,000)      
Total net assets acquired 11,339,000      
Goodwill $ 2,902,000