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Securities Held to Maturity - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 589,730 $ 493,321
Gross Unrecognized Losses 141 4,057
Gross Unrecognized Losses 10,372 1,584
Securities held to maturity, estimated fair value 579,499 495,794
Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 433,953 348,608
Gross Unrecognized Losses 25 3,061
Gross Unrecognized Losses 8,223 1,380
Securities held to maturity, estimated fair value 425,755 350,289
Debt Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 155,777 144,713
Gross Unrecognized Losses 116 996
Gross Unrecognized Losses 2,149 204
Fair Value 153,744 145,505
Debt Securities [Member] | U.S. Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   35,000
Gross Unrecognized Losses   48
Fair Value   34,952
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 109,483 94,713
Gross Unrecognized Losses 79 996
Gross Unrecognized Losses 1,865 156
Fair Value 107,697 95,553
Debt Securities [Member] | Subordinated Debt [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 46,294 15,000
Gross Unrecognized Losses 37  
Gross Unrecognized Losses 284  
Fair Value 46,047 15,000
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 56,886 17,854
Gross Unrecognized Losses 6 10
Gross Unrecognized Losses 1,348 403
Securities held to maturity, estimated fair value 55,544 17,461
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Government National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 21,045 2,199
Gross Unrecognized Losses 671 46
Securities held to maturity, estimated fair value 20,374 2,153
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 11,563 15,522
Gross Unrecognized Losses 503 357
Securities held to maturity, estimated fair value 11,060 15,165
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Federal National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 24,263 111
Gross Unrecognized Losses 6 10
Gross Unrecognized Losses 174  
Securities held to maturity, estimated fair value 24,095 121
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Non-Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 15 22
Securities held to maturity, estimated fair value 15 22
Residential Pass-Through Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 200,622 178,813
Gross Unrecognized Losses 19 429
Gross Unrecognized Losses 4,005 935
Securities held to maturity, estimated fair value 196,636 178,307
Residential Pass-Through Securities [Member] | Government National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,553  
Gross Unrecognized Losses 15  
Securities held to maturity, estimated fair value 2,538  
Residential Pass-Through Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 37,074 35,289
Gross Unrecognized Losses 1 1
Gross Unrecognized Losses 950 338
Securities held to maturity, estimated fair value 36,125 34,952
Residential Pass-Through Securities [Member] | Federal National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 160,995 143,524
Gross Unrecognized Losses 18 428
Gross Unrecognized Losses 3,040 597
Securities held to maturity, estimated fair value 157,973 143,355
Commercial Pass-Through Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 176,445 151,941
Gross Unrecognized Losses   2,622
Gross Unrecognized Losses 2,870 42
Securities held to maturity, estimated fair value 173,575 154,521
Commercial Pass-Through Securities [Member] | Government National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 32,149 1,989
Gross Unrecognized Losses 205 11
Securities held to maturity, estimated fair value 31,944 1,978
Commercial Pass-Through Securities [Member] | Commercial Pass-Through Securities: Federal National Mortgage Association [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 144,296 149,952
Gross Unrecognized Losses   2,622
Gross Unrecognized Losses 2,665 31
Securities held to maturity, estimated fair value $ 141,631 $ 152,543