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Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Carrying Amount $ 340,136,000 $ 135,034,000 $ 127,034,000 $ 155,584,000
Debt securities available for sale, Carrying Amount 420,660,000 407,898,000    
Mortgage-backed securities available for sale, Carrying Amount 346,619,000 437,223,000    
Debt securities held to maturity, Carrying Amount 219,862,000 216,414,000    
Mortgage-backed securities held to maturity, Carrying Amount 443,479,000 295,658,000    
Loans receivable, Carrying Amount 2,087,258,000 1,729,084,000    
FHLB stock, Carrying Amount 27,468,000 25,990,000    
Interest receivable, Carrying Amount 9,873,000 9,013,000    
Deposits, Carrying Amount 2,465,650,000 2,479,941,000    
Borrowings, Carrying Amount 571,499,000 512,257,000    
Interest payable on borrowings, Carrying Amount 1,020,000 1,001,000    
Cash and cash equivalents, Fair Value 340,136,000 135,034,000    
Debt securities available for sale 420,660,000 407,898,000    
Mortgage-backed securities available for sale, Fair Value 346,619,000 437,223,000    
Debt securities held to maturity, Fair Value 218,366,000 213,472,000    
Mortgage-backed securities held to maturity, Fair Value 445,501,000 293,781,000    
Loans receivable, Fair Value 2,069,209,000 1,711,972,000    
FHLB stock, Fair Value 27,468,000 25,990,000    
Interest receivable, Fair Value 9,873,000 9,013,000    
Deposits, Fair Value 2,476,425,000 2,490,933,000    
Borrowings, Fair Value 585,209,000 521,839,000    
Interest payable on borrowings, Fair Value 1,020,000 1,001,000    
Derivative instruments, Fair Value, Net (8,717,000) (975,000)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 340,136,000 135,034,000    
Interest receivable, Fair Value 9,873,000 9,013,000    
Deposits, Fair Value 1,463,974,000 1,442,723,000    
Interest payable on borrowings, Fair Value 1,020,000 1,001,000    
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Debt securities available for sale 420,660,000 407,898,000    
Mortgage-backed securities available for sale, Fair Value 346,619,000 437,223,000    
Debt securities held to maturity, Fair Value 218,366,000 213,472,000    
Mortgage-backed securities held to maturity, Fair Value 445,501,000 293,781,000    
Derivative instruments, Fair Value, Net (8,717,000) (975,000)    
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loans receivable, Fair Value 2,069,209,000 1,711,972,000    
FHLB stock, Fair Value 27,468,000 25,990,000    
Deposits, Fair Value 1,012,451,000 1,048,210,000    
Borrowings, Fair Value 585,209,000 521,539,000    
Interest Rate Swaps [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative instruments, Carrying Amount (9,511,000) (2,714,000)    
Derivative instruments, Fair Value, Net (9,511,000) (2,714,000)    
Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative instruments, Fair Value, Net (9,511,000) (2,714,000)    
Interest Rate Caps [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative instruments, Carrying Amount 794,000 1,739,000    
Derivative instruments, Fair Value, Net 794,000 1,739,000    
Interest Rate Caps [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative instruments, Fair Value, Net $ 794,000 $ 1,739,000