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Mergers and Acquisitions (Allocation of the Purchase Price) (Detail) - USD ($)
Mar. 01, 2015
Feb. 27, 2015
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets acquired:          
Goodwill     $ 3,918,000 $ 3,918,000 $ 3,918,000
Phoenix Bancorp Inc. [Member]          
Assets acquired:          
Cash and cash equivalents $ 11,044,000        
Investment securities 11,331,000        
Loans 110,363,000        
Goodwill 2,902,000        
Core deposit and other intangibles 578,000        
Other assets 7,489,000        
Total assets acquired 143,707,000        
Liabilities assumed:          
Deposits 123,238,000        
FHLB borrowings 3,570,000        
Other liabilities 908,000        
Total liabilities assumed 127,716,000        
Equity acquired:          
Preferred stock 1,750,000        
Total equity acquired and liabilities assumed 129,466,000        
Consideration paid 14,241,000        
Cash paid 2,949,000 $ 2,949,000      
Fair value of common stock issued, including replacement equity awards $ 11,292,000