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Investment Securities - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Carrying value of investment securities | $ 2,610,000,000 | $ 3,570,000,000 |  |
Investment securities pledged as collateral | 162,400,000 | 142,100,000 |  |
Available for sale securities sold | 0 | 0 | $ 67,300,000 |
Provision for credit loss | (330,000) | 1,683,000 | 0 |
Investment securities, provision for credit losses | 2,195,000 | 2,525,000 | 842,000 | $ 842,000
Allowance for credit loss, held-to-maturity | 2,005,000 | 2,005,000 | 2,005,000 | $ 0
Provision for credit losses | 0 | 0 | $ 2,005,000 |
Fair value of unrealized losses | $ 334,860,000 | $ 333,485,000 |  |
Percentage of Company's investment portfolio | 38.90% | 30.40% |  |
Number of investment securities available for sale | security | 1,535 |  |  |
Number of investment in debt securities unrealized loss position | security | 1,306 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (338,604,000) | $ (336,279,000) |  |
Number of investment securities held to maturity | security | 512 |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 507 |  |  |
Unrealized losses | $ (132,303,000) | (112,063,000) |  |
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 |  |
Fair value of unrealized losses | $ 13,746,000 | 17,091,000 |  |
Number of investment in debt securities unrealized loss position | security | 65 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (14,072,000) | (17,093,000) |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 5 |  |  |
Unrealized losses | $ (3,021,000) | (2,607,000) |  |
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 |  |
Fair value of unrealized losses | $ 202,451,000 | 189,391,000 |  |
Number of investment in debt securities unrealized loss position | security | 650 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (203,539,000) | (191,557,000) |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 20 |  |  |
Unrealized losses | $ (6,695,000) | (4,362,000) |  |
Private mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |
Fair value of unrealized losses | $ 13,120,000 | 15,891,000 |  |
Number of investment in debt securities unrealized loss position | security | 32 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (13,249,000) | (16,117,000) |  |
Non-government-sponsored asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |
Fair value of unrealized losses | $ 3,374,000 | 7,551,000 |  |
Number of investment in debt securities unrealized loss position | security | 23 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (3,434,000) | (7,551,000) |  |
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 |  |
Fair value of unrealized losses | $ 84,799,000 | 75,531,000 |  |
Number of investment in debt securities unrealized loss position | security | 474 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (86,029,000) | (75,931,000) |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 482 |  |  |
Unrealized losses | $ (122,587,000) | (105,094,000) |  |
Other securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment securities, provision for credit losses | 2,195,000 | 2,525,000 |  |
Fair value of unrealized losses | $ 17,370,000 | 28,030,000 |  |
Number of investment in debt securities unrealized loss position | security | 62 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (18,281,000) | $ (28,030,000) |  |

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