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Investment Securities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) security | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Carrying value of investment securities | $ 3,550,000,000 |  | $ 3,570,000,000 |
Investment securities pledged as collateral | 176,100,000 |  | 142,100,000 |
Available for sale securities sold | 0 | $ 0 |  |
Provision for credit loss | 0 | 0 | 1,683,000 |
Investment securities, provision for credit losses | 2,525,000 | 842,000 | 2,525,000 | $ 842,000
Allowance for credit loss, held-to-maturity | 2,005,000 | $ 2,005,000 | 2,005,000 | $ 2,005,000
Debt securities available for sale unrealized loss position | 364,793,000 |  | 336,279,000 |
Fair value of unrealized losses | $ 361,287,000 |  | 333,485,000 |
Percentage of Company's investment portfolio | 34.70% |  |  |
Maturity description of investment portfolio | five years or less |  |  |
Number of investment securities available for sale | security | 1,570 |  |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 1,321 |  |  |
Number of investment securities held to maturity | security | 508 |  |  |
Unrealized losses | $ 121,657,000 |  | 112,063,000 |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 492 |  |  |
U.S. government-sponsored enterprises |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | 0 |
Allowance for credit loss, held-to-maturity | 0 |  | 0 |
Debt securities available for sale unrealized loss position | 18,537,000 |  | 17,093,000 |
Fair value of unrealized losses | $ 18,008,000 |  | 17,091,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 63 |  |  |
Unrealized losses | $ 3,342,000 |  | 2,607,000 |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 5 |  |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | 0 |
Allowance for credit loss, held-to-maturity | 0 |  | 0 |
Debt securities available for sale unrealized loss position | 215,187,000 |  | 191,557,000 |
Fair value of unrealized losses | $ 214,231,000 |  | 189,391,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 660 |  |  |
Unrealized losses | $ 6,093,000 |  | 4,362,000 |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 20 |  |  |
Private mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | 0 |
Debt securities available for sale unrealized loss position | 16,614,000 |  | 16,117,000 |
Fair value of unrealized losses | $ 16,614,000 |  | 15,891,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 32 |  |  |
Non-government-sponsored asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 0 |  |  |
Debt securities available for sale unrealized loss position | 6,421,000 |  | 7,551,000 |
Fair value of unrealized losses | $ 6,406,000 |  | 7,551,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 33 |  |  |
State and political subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | 0 |
Allowance for credit loss, held-to-maturity | 2,005,000 |  | 2,005,000 |
Debt securities available for sale unrealized loss position | 81,647,000 |  | 75,931,000 |
Fair value of unrealized losses | $ 80,726,000 |  | 75,531,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 471 |  |  |
Unrealized losses | $ 112,222,000 |  | 105,094,000 |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 467 |  |  |
Other securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | $ 2,525,000 |  | 2,525,000 |
Debt securities available for sale unrealized loss position | 26,387,000 |  | 28,030,000 |
Fair value of unrealized losses | $ 25,302,000 |  | $ 28,030,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 62 |  |  |

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