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Borrowings - Advances of Debt (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
[1]
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 80,000 $ 70,000
Interest Rate 2.46%  
Adjustable Rate Hybrid | Federal Home Loan Bank Advances One    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Non current $ 10,000  
Originated Apr. 12, 2013  
Interest Rate 4.72%  
Maturity Date Apr. 13, 2020  
Fixed Rate Credit | Federal Home Loan Bank Advances Two    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Current $ 60,000  
Originated Sep. 04, 2018  
Interest Rate 2.11%  
Maturity Date Oct. 04, 2018  
Fixed Rate Credit | Federal Home Loan Bank Advances Three    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Current $ 10,000  
Originated Sep. 26, 2018  
Interest Rate 2.27%  
Maturity Date Oct. 12, 2018  
[1] Derived from audited December 31, 2017 Consolidated Financial Statements.