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Investment Securities - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) security | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Carrying value of investment securities | $ 3,030,000,000.00 |  | $ 3,030,000,000.00 | $ 3,570,000,000 |  |
Investment securities pledged as collateral | 138,000,000.0 |  | 138,000,000.0 | 142,100,000 |  |
Available for sale securities sold | 0 | $ 0 | 0 |  | $ 0 |
Provision for credit loss |  |  | 0 | 0 | 1,683,000 |
Investment securities, provision for credit losses | 2,525,000 | 2,525,000 | 2,525,000 | 2,525,000 | 2,525,000 | $ 842,000
Allowance for credit loss, held-to-maturity | 2,005,000 | $ 2,005,000 | 2,005,000 | 2,005,000 | $ 2,005,000 | $ 2,005,000
Debt securities available for sale unrealized loss position | 348,726,000 |  | 348,726,000 | 336,279,000 |  |
Fair value of unrealized losses | $ 345,842,000 |  | $ 345,842,000 | 333,485,000 |  |
Percentage of Company's investment portfolio |  |  | 29.60% |  |  |
Maturity description of investment portfolio |  |  | five years or less |  |  |
Number of investment securities available for sale | security | 1,559 |  | 1,559 |  |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 1,317 |  | 1,317 |  |  |
Number of investment securities held to maturity | security | 508 |  | 508 |  |  |
Unrealized losses | $ 119,820,000 |  | $ 119,820,000 | 112,063,000 |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 501 |  | 501 |  |  |
U.S. government-sponsored enterprises |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | $ 0 | 0 |  |
Allowance for credit loss, held-to-maturity | 0 |  | 0 | 0 |  |
Debt securities available for sale unrealized loss position | 16,869,000 |  | 16,869,000 | 17,093,000 |  |
Fair value of unrealized losses | $ 16,616,000 |  | $ 16,616,000 | 17,091,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 56 |  | 56 |  |  |
Unrealized losses | $ 3,146,000 |  | $ 3,146,000 | 2,607,000 |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 5 |  | 5 |  |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | $ 0 | 0 |  |
Allowance for credit loss, held-to-maturity | 0 |  | 0 | 0 |  |
Debt securities available for sale unrealized loss position | 201,264,000 |  | 201,264,000 | 191,557,000 |  |
Fair value of unrealized losses | $ 201,105,000 |  | $ 201,105,000 | 189,391,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 656 |  | 656 |  |  |
Unrealized losses | $ 6,084,000 |  | $ 6,084,000 | 4,362,000 |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 19 |  | 19 |  |  |
Private mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | $ 0 | 0 |  |
Debt securities available for sale unrealized loss position | 15,418,000 |  | 15,418,000 | 16,117,000 |  |
Fair value of unrealized losses | $ 15,418,000 |  | $ 15,418,000 | 15,891,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 32 |  | 32 |  |  |
Non-government-sponsored asset 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 | 5,869,000 |  | 5,869,000 | 7,551,000 |  |
Fair value of unrealized losses | $ 5,869,000 |  | $ 5,869,000 | 7,551,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 27 |  | 27 |  |  |
State and political subdivisions |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | $ 0 |  | $ 0 | 0 |  |
Allowance for credit loss, held-to-maturity | 2,005,000 |  | 2,005,000 | 2,005,000 |  |
Debt securities available for sale unrealized loss position | 83,006,000 |  | 83,006,000 | 75,931,000 |  |
Fair value of unrealized losses | $ 81,843,000 |  | $ 81,843,000 | 75,531,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 483 |  | 483 |  |  |
Unrealized losses | $ 110,590,000 |  | $ 110,590,000 | 105,094,000 |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 477 |  | 477 |  |  |
Other securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | $ 2,525,000 |  | $ 2,525,000 | 2,525,000 |  |
Debt securities available for sale unrealized loss position | 26,300,000 |  | 26,300,000 | 28,030,000 |  |
Fair value of unrealized losses | $ 24,991,000 |  | $ 24,991,000 | $ 28,030,000 |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 63 |  | 63 |  |  |

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