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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of the Notional Amount and Fair Value of the Derivative Financial Instruments | The notional amount and fair value of the Company’s derivative financial instruments as of September 30, 2025, and December 31, 2024 were as follows:
| September 30, 2025 |  | December 31, 2024
(dollars in thousands) | Notional Amount | Fair Value |  | Notional Amount | Fair Value
Derivatives designated as hedging instruments |  |  |  |  |
Interest Rate Swap Agreements 1 | $ | 1,400,000 |  | $ | (8,631) |  |  | $ | 2,000,000 |  | $ | 2,738 |
Derivatives not designated as hedging instruments |  |  |  |  |
Interest Rate Lock Commitments | 2,286 |  | 49 |  |  | 1,534 |  | 34 |
Forward Commitments | 3,250 |  | (10) |  |  | 3,517 |  | 6 |
Interest Rate Swap Agreements |  |  |  |  |
Receive Fixed/Pay Variable Swaps | 2,285,594 |  | (71,345) |  |  | 2,123,665 |  | (136,218) |
Pay Fixed/Receive Variable Swaps | 2,285,594 |  | 71,222 |  |  | 2,123,665 |  | 136,125 |
Conversion Rate Swap Agreements 2 | 103,508 |  | NA |  | 96,466 |  | NA
Makewhole Agreements 3 | 46,901 |  | NA |  | 65,763 |  | NA
1 As of September 30, 2025 and December 31, 2024, the amounts presented in the table above exclude forward starting swaps with notional values of $600 million and $300 million, respectively, and fair values of $1.5 million and $4.7 million, respectively. These swaps are scheduled to begin between October 2025 and September 2026. 2 The conversion rate swap agreements were valued at zero as further reductions to the conversion rate were not reasonably estimable. 3 The makewhole agreements were valued at zero as the likelihood of a payment required to the buyer was not reasonably estimable.
Derivative Financial Instruments, their Fair Values, and Balance Sheet Location | The following table presents the Company’s derivative financial instruments, their fair values, and their location in the unaudited consolidated statements of condition as of September 30, 2025 and December 31, 2024:
| September 30, 2025 |  | December 31, 2024
(dollars in thousands) | Asset Derivatives 1 | Liability Derivatives 1 |  | Asset Derivatives 1 | Liability Derivatives 1
Interest Rate Swap Agreements |  |  |  |  |
Not Designated as Hedging Instruments | $ | 101,508 |  | $ | 101,631 |  |  | $ | 146,923 |  | $ | 147,016 |
Designated as Hedging Instruments | 2,551 |  | 9,713 |  |  | 14,507 |  | 7,039 |
| 104,059 |  | 111,344 |  |  | 161,430 |  | 154,055 |
Derivatives not designated as hedging instruments |  |  |  |  |
Interest Rate Lock Commitments | 49 |  | — |  |  | 34 |  | — |
Forward Commitments | 3 |  | 13 |  |  | 9 |  | 3 |
Total Derivatives | $ | 104,111 |  | $ | 111,357 |  |  | $ | 161,473 |  | $ | 154,058 |
1 Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the unaudited consolidated statements of condition. Derivatives are recognized on the Company's unaudited consolidated statements of condition at fair value.
Derivative Financial Instruments and the Amount and Location of the Net Gains or Losses Recognized in the Statements of Income | The following table presents the Company’s derivative financial instruments and the amount and location of the net gains or losses recognized in the unaudited consolidated statements of income for the three and nine months ended September 30, 2025 and 2024:
| Location of Net Gains (Losses) Recognized in the Statements of Income |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(dollars in thousands) |  | 2025 | 2024 |  | 2025 | 2024
Derivatives designated as hedging instruments |  |  |  |  |  |
Recognized on Interest Rate Swap Agreements | Interest Income on Investment Securities Available-for-Sale |  | $ | 726 |  | $ | (22,380) |  |  | $ | (6,764) |  | $ | (2,405) |
Recognized on Hedged Item | Interest Income on Investment Securities Available-for-Sale |  | (750) |  | 22,435 |  |  | 6,746 |  | 2,288 |
Net Cash Settlements | Interest Income on Investment Securities Available-for-Sale |  | 226 |  | 2,615 |  |  | 205 |  | 8,073 |
Recognized on Interest Rate Swap Agreements | Interest and Fees on Loans and Leases |  | 173 |  | (31,458) |  |  | (11,654) |  | (4,634) |
Recognized on Hedged Item | Interest and Fees on Loans and Leases |  | (238) |  | 31,781 |  |  | 11,551 |  | 4,721 |
Net Cash Settlements | Interest and Fees on Loans and Leases |  | 2,130 |  | 3,976 |  |  | 5,639 |  | 10,691 |
Derivatives not designated as hedging instruments |  |  |  |  |  |
Interest Rate Lock Commitments | Mortgage Banking |  | 85 |  | 506 |  |  | 337 |  | 751 |
Forward Commitments | Mortgage Banking |  | (4) |  | (137) |  |  | (8) |  | 79 |
Interest Rate Swap Agreements | Other Noninterest Income |  | (19) |  | (47) |  |  | (29) |  | 6 |
Conversion Rate Swap Agreements | Investment Securities Gains (Losses), Net |  | (780) |  | — |  |  | (1,343) |  | — |
Total |  |  | $ | 1,549 |  | $ | 7,291 |  |  | $ | 4,680 |  | $ | 19,570 |
Schedule of derivative instruments in statement of financial position related to cumulative basis adjustment for fair value hedges | The following amounts were recorded on the unaudited consolidated statements of condition related to the cumulative basis adjustment for fair value hedges as of September 30, 2025 and December 31, 2024:
Line Item in the Unaudited Consolidated Statements of Condition | Carrying Amount of the Hedged Assets |  | Cumulative Amount of Fair Value Hedging Adjustment Included In the Carrying Amount of the Hedged Assets
(dollars in thousands) | September 30, 2025 | December 31, 2024 |  | September 30, 2025 | December 31, 2024
Investment Securities, Available-for-Sale 1 | $ | 1,206,340 |  | $ | 999,594 |  |  | $ | 6,340 |  | $ | (406) |
Loans and Leases 2 | 1,804,221 |  | 1,292,670 |  |  | (2,798) |  | (7,330) |
1 These amounts were included in the fair value of closed portfolios of investment securities, AFS used to designate hedging relationships in which the hedged item is the stated amount of assets in the closed portfolios anticipated to be outstanding for the designated hedge period. As of September 30, 2025 and December 31, 2024, the fair value of the closed portfolios used in these hedging relationships was $1.5 billion and $1.7 billion, respectively. 2 These amounts were included in the amortized cost basis of closed portfolios of loans used to designate hedging relationships in which the hedged item is the stated amount of assets in the closed portfolios anticipated to be outstanding for the designated hedge period. As of September 30, 2025 and December 31, 2024, the amortized cost basis of the closed portfolios used in these hedging relationships was $2.8 billion and $3.0 billion, respectively.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References No definition available. + Details
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