Troubled Debt Restructurings on Financing Receivables (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Financing Receivable, Modifications [Line Items]    
Post-modification outstanding recorded investment $ 507 $ 507
Mortgage Loan Portfolio Segment    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | Contract   1
Pre-modification outstanding recorded investment   $ 463
Post-modification outstanding recorded investment   $ 507
Mortgage Loan Portfolio Segment | Real Estate Loan    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | Contract 1  
Pre-modification outstanding recorded investment $ 463  
Post-modification outstanding recorded investment $ 507  
Mortgage Loan Portfolio Segment | Real Estate Loan | Residential one-to-four family    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | Contract 1 1
Pre-modification outstanding recorded investment $ 463 $ 463
Post-modification outstanding recorded investment $ 507 $ 507