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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost $ 673,555  
Securities available for sale, Fair value 656,202  
Securities available for sale, Amortized Cost 1,462,124 $ 1,666,853
Mortgage-backed securities, Gross Unrealized Gains 260 20,117
Mortgage-backed securities, Gross Unrealized Losses 118,291 10,106
Securities available for sale 1,344,093 1,676,864
Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 788,569 1,047,341
Mortgage-backed securities, Gross Unrealized Gains 46 13,500
Mortgage-backed securities, Gross Unrealized Losses 100,724 9,800
Securities available for sale 687,891 1,051,041
Mortgage-Backed Securities [Member] | Collateralized Mortgage Obligations Excluding Pass Through Securities    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost [1] 7,451 13,420
Mortgage-backed securities, Gross Unrealized Gains [1] 0 319
Mortgage-backed securities, Gross Unrealized Losses [1] 329 0
Securities available for sale [1] 7,122 13,739
Mortgage-Backed Securities [Member] | Residential Pass-Through Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost [1] 595,337 744,196
Mortgage-backed securities, Gross Unrealized Gains [1] 45 7,443
Mortgage-backed securities, Gross Unrealized Losses [1] 80,624 7,148
Securities available for sale [1] 514,758 744,491
Mortgage-Backed Securities [Member] | Commercial Pass-Through Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost [1] 185,781 289,725
Mortgage-backed securities, Gross Unrealized Gains [1] 1 5,738
Mortgage-backed securities, Gross Unrealized Losses [1] 19,771 2,652
Securities available for sale [1] 166,011 292,811
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 673,555 619,512
Securities available for sale, Gross Unrealized Gains 214 6,617
Securities available for sale, Gross Unrealized Losses 17,567 306
Securities available for sale, Fair value 656,202 625,823
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 28,485 33,800
Securities available for sale, Gross Unrealized Gains 39 803
Securities available for sale, Gross Unrealized Losses 89 0
Securities available for sale, Fair value 28,435 34,603
Debt Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 169,506 240,217
Securities available for sale, Gross Unrealized Gains 0 2,835
Securities available for sale, Gross Unrealized Losses 2,949 63
Securities available for sale, Fair value 166,557 242,989
Debt Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 315,693 189,873
Securities available for sale, Gross Unrealized Gains 0 177
Securities available for sale, Gross Unrealized Losses 7,880 170
Securities available for sale, Fair value 307,813 189,880
Debt Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 159,871 155,622
Securities available for sale, Gross Unrealized Gains 175 2,802
Securities available for sale, Gross Unrealized Losses 6,649 73
Securities available for sale, Fair value $ 153,397 $ 158,351
[1] Government-sponsored enterprises.