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Securities | 3 Months Ended
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Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities (In Thousands, Except Number of Securities) The amortized cost and fair value of securities available for sale were as follows as of the dates presented in the tables below. There was no allowance for credit losses allocated to any of the Company’s available for sale securities as of March 31, 2026 or December 31, 2025.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Fair Value
March 31, 2026 |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 272,729 |  |  | $ | 5,493 |  |  | $ | (3,580) |  |  |  |  | $ | 274,642 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 1,045,352 |  |  | 2,144 |  |  | (18,395) |  |  |  |  | 1,029,101 |
Collateralized mortgage obligations | 727,087 |  |  | 3,565 |  |  | (62,584) |  |  |  |  | 668,068 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 99,305 |  |  | 203 |  |  | (461) |  |  |  |  | 99,047 |
Collateralized mortgage obligations | 419,035 |  |  | 2,985 |  |  | (18,798) |  |  |  |  | 403,222 |
Other debt securities | 336,708 |  |  | 1,145 |  |  | (2,286) |  |  |  |  | 335,567 |
| $ | 2,900,216 |  |  | $ | 15,535 |  |  | $ | (106,104) |  |  |  |  | $ | 2,809,647 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 266,553 |  |  | $ | 8,012 |  |  | $ | (1,780) |  |  |  |  |  |  | $ | 272,785 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 793,154 |  |  | 5,670 |  |  | (15,675) |  |  |  |  |  |  | 783,149 |
Collateralized mortgage obligations | 706,986 |  |  | 2,826 |  |  | (57,908) |  |  |  |  |  |  | 651,904 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 100,314 |  |  | 285 |  |  | (762) |  |  |  |  |  |  | 99,837 |
Collateralized mortgage obligations | 419,356 |  |  | 3,552 |  |  | (18,120) |  |  |  |  |  |  | 404,788 |
Other debt securities | 349,132 |  |  | 1,537 |  |  | (2,314) |  |  |  |  |  |  | 348,355 |
| $ | 2,635,495 |  |  | $ | 21,882 |  |  | $ | (96,559) |  |  |  |  |  |  | $ | 2,560,818 |
The amortized cost and fair value of securities held to maturity were as follows as of the dates presented:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 278,510 |  |  | $ | 9 |  |  | $ | (31,584) |  |  |  |  |  |  | $ | 246,935 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 313,373 |  |  | — |  |  | (12,441) |  |  |  |  |  |  | 300,932 |
Collateralized mortgage obligations | 312,961 |  |  | — |  |  | (23,348) |  |  |  |  |  |  | 289,613 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,901 |  |  | — |  |  | (2,079) |  |  |  |  |  |  | 14,822 |
Collateralized mortgage obligations | 41,851 |  |  | — |  |  | (6,004) |  |  |  |  |  |  | 35,847 |
Other debt securities | 42,947 |  |  | — |  |  | (2,400) |  |  |  |  |  |  | 40,547 |
| $ | 1,006,543 |  |  | $ | 9 |  |  | $ | (77,856) |  |  |  |  |  |  | $ | 928,696 |
Allowance for credit losses - held to maturity securities | (32) |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities, net of allowance for credit losses | $ | 1,006,511 |  |  |  |  |  |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 279,424 |  |  | $ | 29 |  |  | $ | (29,516) |  |  |  |  |  |  | $ | 249,937 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 323,993 |  |  | — |  |  | (10,030) |  |  |  |  |  |  | 313,963 |
Collateralized mortgage obligations | 320,258 |  |  | — |  |  | (18,600) |  |  |  |  |  |  | 301,658 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,938 |  |  | — |  |  | (2,059) |  |  |  |  |  |  | 14,879 |
Collateralized mortgage obligations | 42,079 |  |  | — |  |  | (5,997) |  |  |  |  |  |  | 36,082 |
Other debt securities | 47,413 |  |  | — |  |  | (2,062) |  |  |  |  |  |  | 45,351 |
| $ | 1,030,105 |  |  | $ | 29 |  |  | $ | (68,264) |  |  |  |  |  |  | $ | 961,870 |
Allowance for credit losses - held to maturity securities | (32) |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities, net of allowance for credit losses | $ | 1,030,073 |  |  |  |  |  |  |  |  |  |  |
No securities were sold during the first quarter of 2026 or 2025.
At March 31, 2026 and December 31, 2025, securities with a carrying value of $1,716,468 and $1,732,787, respectively, were pledged to secure government, public and trust deposits. Securities with a carrying value of $8,896 and $21,377 were pledged as collateral for short-term borrowings and derivative instruments, respectively, at March 31, 2026. Securities with a carrying value of $9,023 and $18,732 were pledged as collateral for short-term borrowings and derivative instruments, respectively, at December 31, 2025. The amortized cost and fair value of securities at March 31, 2026 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may call or prepay obligations with or without call or prepayment penalties.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 230 |  |  | $ | 230 |  |  | $ | 7,235 |  |  | $ | 7,247 |
Due after one year through five years | 12,007 |  |  | 11,528 |  |  | 73,896 |  |  | 74,540 |
Due after five years through ten years | 186,144 |  |  | 166,048 |  |  | 123,963 |  |  | 123,220 |
Due after ten years | 80,129 |  |  | 69,129 |  |  | 117,477 |  |  | 119,256 |
Residential mortgage-backed securities: |  |  |  |  |  |  |
Agency mortgage-backed securities | 313,373 |  |  | 300,932 |  |  | 1,045,352 |  |  | 1,029,101 |
Collateralized mortgage obligations | 312,961 |  |  | 289,613 |  |  | 727,087 |  |  | 668,068 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,901 |  |  | 14,822 |  |  | 99,305 |  |  | 99,047 |
Collateralized mortgage obligations | 41,851 |  |  | 35,847 |  |  | 419,035 |  |  | 403,222 |
Other debt securities | 42,947 |  |  | 40,547 |  |  | 286,866 |  |  | 285,946 |
| $ | 1,006,543 |  |  | $ | 928,696 |  |  | $ | 2,900,216 |  |  | $ | 2,809,647 |
The following tables present the age of gross unrealized losses and fair value by investment category for which an allowance for credit losses has not been recorded as of the dates presented:
| Less than 12 Months |  | 12 Months or More |  | Total
| # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 41 |  |  | $ | 61,680 |  |  | $ | (1,575) |  |  | 11 |  | $ | 15,793 |  |  | $ | (2,005) |  |  | 52 |  | $ | 77,473 |  |  | $ | (3,580) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 18 |  |  | 408,243 |  |  | (2,236) |  |  | 38 |  | 192,999 |  |  | (16,159) |  |  | 56 |  | 601,242 |  |  | (18,395) |
Collateralized mortgage obligations | 2 |  |  | 73,544 |  |  | (333) |  |  | 38 |  | 287,019 |  |  | (62,251) |  |  | 40 |  | 360,563 |  |  | (62,584) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 8 |  | 46,283 |  |  | (180) |  |  | 1 |  | 4,680 |  |  | (281) |  |  | 9 |  | 50,963 |  |  | (461) |
Collateralized mortgage obligations | 24 |  | 107,519 |  |  | (635) |  |  | 26 |  | 102,716 |  |  | (18,163) |  |  | 50 |  | 210,235 |  |  | (18,798) |
Other debt securities | 12 |  |  | 150,891 |  |  | (293) |  |  | 10 |  | 68,947 |  |  | (1,993) |  |  | 22 |  | 219,838 |  |  | (2,286) |
Total | 105 |  | $ | 848,160 |  |  | $ | (5,252) |  |  | 124 |  | $ | 672,154 |  |  | $ | (100,852) |  |  | 229 |  | $ | 1,520,314 |  |  | $ | (106,104) |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 13 |  | $ | 19,454 |  |  | $ | (445) |  |  | 7 |  | $ | 13,591 |  |  | $ | (1,335) |  |  | 20 |  | $ | 33,045 |  |  | $ | (1,780) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 8 |  | 135,320 |  |  | (903) |  |  | 36 |  | 132,975 |  |  | (14,772) |  |  | 44 |  | 268,295 |  |  | (15,675) |
Collateralized mortgage obligations | 2 |  |  | 24,816 |  |  | (58) |  |  | 37 |  | 299,606 |  |  | (57,850) |  |  | 39 |  | 324,422 |  |  | (57,908) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 9 |  |  | 71,188 |  |  | (395) |  |  | 2 |  | 5,595 |  |  | (367) |  |  | 11 |  | 76,783 |  |  | (762) |
Collateralized mortgage obligations | 12 |  |  | 40,387 |  |  | (56) |  |  | 25 |  | 102,206 |  |  | (18,064) |  |  | 37 |  | 142,593 |  |  | (18,120) |
Other debt securities | 10 |  | 191,504 |  |  | (1,347) |  |  | 8 |  | 14,571 |  |  | (967) |  |  | 18 |  | 206,075 |  |  | (2,314) |
Total | 54 |  | $ | 482,669 |  |  | $ | (3,204) |  |  | 115 |  | $ | 568,544 |  |  | $ | (93,355) |  |  | 169 |  | $ | 1,051,213 |  |  | $ | (96,559) |
| Less than 12 Months |  | 12 Months or More |  | Total
| # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses
Held to Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 7 |  | $ | 17,311 |  |  | $ | (1,296) |  |  | 117 |  | $ | 227,737 |  |  | $ | (30,288) |  |  | 124 |  | $ | 245,048 |  |  | $ | (31,584) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 4 |  | 44,100 |  |  | (728) |  |  | 62 |  | 256,832 |  |  | (11,713) |  |  | 66 |  | 300,932 |  |  | (12,441) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 18 |  | 289,613 |  |  | (23,348) |  |  | 18 |  | 289,613 |  |  | (23,348) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 1 |  | 14,823 |  |  | (2,079) |  |  | 1 |  | 14,823 |  |  | (2,079) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 9 |  | 35,847 |  |  | (6,004) |  |  | 9 |  | 35,847 |  |  | (6,004) |
Other debt securities | — |  | — |  |  | — |  |  | 10 |  | 40,547 |  |  | (2,400) |  |  | 10 |  | 40,547 |  |  | (2,400) |
Total | 11 |  | $ | 61,411 |  |  | $ | (2,024) |  |  | 217 |  | $ | 865,399 |  |  | $ | (75,832) |  |  | 228 |  | $ | 926,810 |  |  | $ | (77,856) |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | — |  | $ | — |  |  | $ | — |  |  | 124 |  | $ | 248,044 |  |  | $ | (29,516) |  |  | 124 |  | $ | 248,044 |  |  | $ | (29,516) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 66 |  | 313,963 |  |  | (10,030) |  |  | 66 |  | 313,963 |  |  | (10,030) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 18 |  | 301,657 |  |  | (18,600) |  |  | 18 |  | 301,657 |  |  | (18,600) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 1 |  | 14,879 |  |  | (2,059) |  |  | 1 |  | 14,879 |  |  | (2,059) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 9 |  | 36,083 |  |  | (5,997) |  |  | 9 |  | 36,083 |  |  | (5,997) |
Other debt securities | — |  | — |  |  | — |  |  | 10 |  | 45,351 |  |  | (2,062) |  |  | 10 |  | 45,351 |  |  | (2,062) |
Total | — |  | $ | — |  |  | $ | — |  |  | 228 |  | $ | 959,977 |  |  | $ | (68,264) |  |  | 228 |  | $ | 959,977 |  |  | $ | (68,264) |
The Company evaluates its available for sale investment securities in an unrealized loss position on a quarterly basis. If the Company intends to sell the security or it is more likely than not that it will be required to sell before recovery, the entire unrealized loss is recorded as a loss within noninterest income in the Consolidated Statements of Income along with a corresponding adjustment to the amortized cost basis of the security. If the Company does not intend to sell the security and it is not more likely than not that it will be required to sell the security before recovery of its amortized cost basis, the Company evaluates if any of the unrealized loss is related to a potential credit loss. The amount related to credit loss, if any, is recognized in earnings as a provision for credit loss and a corresponding allowance for credit losses is established; each is calculated as the difference between the estimate of the discounted future contractual cash flows and the amortized cost basis of the security. A number of qualitative and quantitative factors are considered by management in the estimate of the discounted future contractual cash flows, including the financial condition of the underlying issuer, current and projected deferrals or defaults and credit ratings by nationally recognized statistical rating agencies. The remaining difference between the fair value and the amortized cost basis of the security is considered the amount related to other market factors and is recognized in other comprehensive income, net of tax. As of March 31, 2026, the Company did not intend to sell any of the securities in an unrealized loss position, and it is not more likely than not that the Company will be required to sell any such security prior to the recovery of its amortized cost basis, which may be maturity. Furthermore, approximately 88% of available for sale securities have the explicit backing of the U.S. government or a guarantee from a U.S. government sponsored enterprise that has perceived credit risk the same as the U.S. government. Performance of these securities has been in line with broader market price performance, indicating that increases in market-based, risk-free rates, and not credit-related factors, are driving losses. When determining the fair value of the contractual cash flows for municipal and corporate securities, the Company considers historical experience with credit sensitive securities, current market conditions, the financial condition of the underlying issuer, current credit ratings, ratings changes and outlook, explicit and implicit guarantees, or insurance programs. Based upon its review of these factors as of March 31, 2026, the Company determined that all such losses resulted from factors not deemed credit-related. As a result, no credit-related impairment was recognized in current earnings, and all unrealized losses for available for sale securities were recorded in other comprehensive income (loss). See Note 12, “Other Comprehensive Income” for more information on the Company’s unrealized losses on securities. The allowance for credit losses on held to maturity securities was $32 at each of March 31, 2026 and December 31, 2025. The Company monitors the credit quality of debt securities held to maturity using bond investment grades assigned by nationally recognized statistical ratings agencies. Updated investment grades are obtained as they become available from agencies. As of March 31, 2026, all of the debt securities held to maturity were rated A or higher by the ratings agencies.

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