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Securities Held to Maturity - Amortized Cost, Gross Unrecognized Gains and Losses and Fair Values of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
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Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | $ 592,199 | $ 589,730
Gross Unrecognized Gains | 3,094 | 141
Gross Unrecognized Losses | 2,479 | 10,372
Securities held to maturity, estimated fair value | 592,814 | 579,499
Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 421,717 | 433,953
Gross Unrecognized Gains | 2,036 | 25
Gross Unrecognized Losses | 2,108 | 8,223
Securities held to maturity, estimated fair value | 421,645 | 425,755
Debt Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 170,482 | 155,777
Gross Unrecognized Gains | 1,058 | 116
Gross Unrecognized Losses | 371 | 2,149
Fair Value | 171,169 | 153,744
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 107,375 | 109,483
Gross Unrecognized Gains | 906 | 79
Gross Unrecognized Losses | 180 | 1,865
Fair Value | 108,101 | 107,697
Debt Securities [Member] | Subordinated Debt [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 63,107 | 46,294
Gross Unrecognized Gains | 152 | 37
Gross Unrecognized Losses | 191 | 284
Fair Value | 63,068 | 46,047
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 49,368 | 56,886
Gross Unrecognized Gains | 158 | 6
Gross Unrecognized Losses | 298 | 1,348
Securities held to maturity, estimated fair value | 49,228 | 55,544
Residential Pass-Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 174,338 | 200,622
Gross Unrecognized Gains | 848 | 19
Gross Unrecognized Losses | 1,625 | 4,005
Securities held to maturity, estimated fair value | 173,561 | 196,636
Commercial Pass-Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 198,011 | 176,445
Gross Unrecognized Gains | 1,030 |
Gross Unrecognized Losses | 185 | 2,870
Securities held to maturity, estimated fair value | $ 198,856 | $ 173,575

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