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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
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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