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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, 2019
Jun. 30, 2018
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost $ 576,652 $ 589,730
Gross Unrecognized Gains 8,734 141
Gross Unrecognized Losses 708 10,372
Securities held to maturity, estimated fair value 584,678 579,499
Mortgage-Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost 409,480 433,953
Gross Unrecognized Gains 6,033 25
Gross Unrecognized Losses 692 8,223
Securities held to maturity, estimated fair value 414,821 425,755
Debt Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost 167,172 155,777
Gross Unrecognized Gains 2,701 116
Gross Unrecognized Losses 16 2,149
Fair Value 169,857 153,744
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost 104,086 109,483
Gross Unrecognized Gains 1,787 79
Gross Unrecognized Losses 16 1,865
Fair Value 105,857 107,697
Debt Securities [Member] | Subordinated Debt [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost 63,086 46,294
Gross Unrecognized Gains 914 37
Gross Unrecognized Losses 168 284
Fair Value 64,000 46,047
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost [1] 46,370 56,871
Gross Unrecognized Gains [1] 568 6
Gross Unrecognized Losses [1] 168 1,348
Securities held to maturity, estimated fair value [1] 46,770 55,529
Non-agency securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost 11 15
Securities held to maturity, estimated fair value 11 15
Residential Pass-Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost [1] 166,283 200,622
Gross Unrecognized Gains [1] 1,961 19
Gross Unrecognized Losses [1] 518 4,005
Securities held to maturity, estimated fair value [1] 167,726 196,636
Commercial Pass-Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Amortized Cost [1] 196,816 176,445
Gross Unrecognized Gains [1] 3,504  
Gross Unrecognized Losses [1] 6 2,870
Securities held to maturity, estimated fair value [1] $ 200,314 $ 173,575
[1] (1)Government-sponsored enterprises.