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Securities - Stratification by Contractual Maturity of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 1,437,195 | $ 1,462,124
Fair Value |  |
Fair Value | 1,286,354 | 1,344,093
Amortized Cost |  |
Amortized Cost | 153,786 | 118,291
Fair Value |  |
Fair Value | 138,393 | 108,118
Debt securities: |  |
Amortized Cost |  |
Due in one year or less | 0 |
Due after one year through five years | 11,865 |
Due after five years through ten years | 342,467 |
Due after ten years | 359,973 |
Amortized Cost | 714,305 | 673,555
Fair Value |  |
Due in one year or less | 0 |
Due after one year through five years | 11,783 |
Due after five years through ten years | 326,847 |
Due after ten years | 349,007 |
Fair Value | 687,637 | 656,202
Amortized Cost |  |
Due in one year or less | 4,160 |
Due after one year through five years | 12,946 |
Due after five years through ten years | 1,700 |
Due after ten years | 0 |
Amortized Cost | 18,806 | 21,159
Fair Value |  |
Due in one year or less | 4,143 |
Due after one year through five years | 12,713 |
Due after five years through ten years | 1,665 |
Due after ten years | 0 |
Fair Value | $ 18,521 | $ 21,125

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