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Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Security
Jun. 30, 2022
USD ($)
Security
Securities Available-for-sale    
Less than 12 Months: Fair Value $ 547,510 $ 847,082
Less than 12 Months: Unrealized Losses 23,432 46,005
12 Months or More: Fair Value 717,632 456,929
12 Months or More: Unrealized Losses $ 127,451 $ 72,286
Total: Number of Securities | Security 190 229
Total: Fair Value $ 1,265,142 $ 1,304,011
Total: Unrealized Losses 150,883 118,291
Securities Held to Maturity    
Less than 12 Months: Fair value 111,125 95,674
Less than 12 Months: Unrecognized Losses 9,377 10,217
12 Months or More: Fair Value 26,804 0
12 Months or More: Unrecognized Losses $ 6,016 $ 0
Total: Number of Securities | Security 46 24
Fair Value: Total $ 137,929 $ 95,674
Total: Unrecognized Losses 15,393 10,217
Obligations of state and political subdivisions    
Securities Available-for-sale    
Less than 12 Months: Fair Value   11,310
Less than 12 Months: Unrealized Losses   89
12 Months or More: Fair Value   0
12 Months or More: Unrealized Losses   $ 0
Total: Number of Securities | Security   30
Total: Fair Value   $ 11,310
Total: Unrealized Losses   89
Securities Held to Maturity    
Less than 12 Months: Fair value 18,057 8,681
Less than 12 Months: Unrecognized Losses 285 78
12 Months or More: Fair Value 0 0
12 Months or More: Unrecognized Losses $ 0 $ 0
Total: Number of Securities | Security 36 15
Fair Value: Total $ 18,057 $ 8,681
Total: Unrecognized Losses 285 78
Asset-backed securities    
Securities Available-for-sale    
Less than 12 Months: Fair Value 137,203 161,303
Less than 12 Months: Unrealized Losses 2,406 2,928
12 Months or More: Fair Value 21,420 5,254
12 Months or More: Unrealized Losses $ 480 $ 21
Total: Number of Securities | Security 15 15
Total: Fair Value $ 158,623 $ 166,557
Total: Unrealized Losses 2,886 2,949
Collateralized loan obligations    
Securities Available-for-sale    
Less than 12 Months: Fair Value 177,907 236,967
Less than 12 Months: Unrealized Losses 3,631 6,435
12 Months or More: Fair Value 192,556 70,846
12 Months or More: Unrealized Losses $ 5,368 $ 1,445
Total: Number of Securities | Security 28 24
Total: Fair Value $ 370,463 $ 307,813
Total: Unrealized Losses 8,999 7,880
Corporate bonds    
Securities Available-for-sale    
Less than 12 Months: Fair Value 87,731 129,407
Less than 12 Months: Unrealized Losses 7,972 6,464
12 Months or More: Fair Value 50,356 3,815
12 Months or More: Unrealized Losses $ 6,845 $ 185
Total: Number of Securities | Security 29 27
Total: Fair Value $ 138,087 $ 133,222
Total: Unrealized Losses 14,817 6,649
Collateralized mortgage obligations    
Securities Available-for-sale    
Less than 12 Months: Fair Value   7,122
Less than 12 Months: Unrealized Losses   329
12 Months or More: Fair Value   0
12 Months or More: Unrealized Losses   $ 0
Total: Number of Securities | Security   6
Total: Fair Value   $ 7,122
Total: Unrealized Losses   329
Commercial pass-through securities    
Securities Available-for-sale    
Less than 12 Months: Fair Value 93,772 63,045
Less than 12 Months: Unrealized Losses 4,262 3,194
12 Months or More: Fair Value 54,789 102,817
12 Months or More: Unrealized Losses $ 12,773 $ 16,577
Total: Number of Securities | Security 12 21
Total: Fair Value $ 148,561 $ 165,862
Total: Unrealized Losses 17,035 19,771
Securities Held to Maturity    
Less than 12 Months: Fair value 0 10,729
Less than 12 Months: Unrecognized Losses 0 1,552
12 Months or More: Fair Value 10,055 0
12 Months or More: Unrecognized Losses $ 2,210 $ 0
Total: Number of Securities | Security 1 1
Fair Value: Total $ 10,055 $ 10,729
Total: Unrecognized Losses 2,210 1,552
Residential pass-through securities    
Securities Available-for-sale    
Less than 12 Months: Fair Value 50,897 237,928
Less than 12 Months: Unrealized Losses 5,161 26,566
12 Months or More: Fair Value 398,511 274,197
12 Months or More: Unrealized Losses $ 101,985 $ 54,058
Total: Number of Securities | Security 106 106
Total: Fair Value $ 449,408 $ 512,125
Total: Unrealized Losses 107,146 80,624
Securities Held to Maturity    
Less than 12 Months: Fair value 93,068 76,264
Less than 12 Months: Unrecognized Losses 9,092 8,587
12 Months or More: Fair Value 16,749 0
12 Months or More: Unrecognized Losses $ 3,806 $ 0
Total: Number of Securities | Security 9 8
Fair Value: Total $ 109,817 $ 76,264
Total: Unrecognized Losses $ 12,898 $ 8,587