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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items] |  |  |
Accrued interest receivable | $ 67,887 |  | $ 66,525
Revolving loans, converted to term loan during the period | $ 3,400 |  | 13,200
Number of days non-accrual loans are not past due | 30 days |  |
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure | $ 4,600 |  |
Pass | Residential Mortgage |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of days past due for loans and leases in classified credit quality indicator | 90 days |  |
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) | 60.00% |  |
Pass | Home Equity |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of days past due for loans and leases in classified credit quality indicator | 90 days |  |
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) | 60.00% |  |
Maximum current combined loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) | 60.00% |  |
Classified |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest | 6 months |  |
Accrued Interest Receivable |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Accrued interest receivable | $ 48,400 |  | $ 48,400
Maximum [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Net gains (loss) related to sales of residential mortgage loans | $ 100 | $ 100 |
Consumer | Classified |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of days past due for loans and leases in classified credit quality indicator | 90 days |  |

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -SubTopic 310 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -SubTopic 310 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 310 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479584/944-310-50-1 + Details
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