XML 55 R33.htm IDEA: XBRL DOCUMENT v3.26.1
Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-sale
The amortized cost, fair value and allowance for credit losses of investment securities that are classified as AFS are as follows:

(In thousands)Amortized
Cost		Allowance
for Credit Losses		Gross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Available-for-sale
March 31, 2026
U.S. Government agencies$46,897 $— $5 $(573)$46,329 
Mortgage-backed securities2,317,158 — 2,096 (190,522)2,128,732 
State and political subdivisions1,040,398 — 29 (201,547)838,880 
Other securities143,534 — 67 (5,256)138,345 
Total AFS$3,547,987 $— $2,197 $(397,898)$3,152,286 
December 31, 2025
U.S. Government agencies$47,786 $— $6 $(620)$47,172 
Mortgage-backed securities2,385,646 — 6,072 (189,760)2,201,958 
State and political subdivisions1,046,121 — 42 (187,092)859,071 
Other securities163,256 — 209 (5,445)158,020 
Total AFS$3,642,809 $— $6,329 $(382,917)$3,266,221 
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following table summarizes the Company’s AFS investments in an unrealized loss position for which an allowance for credit loss has not been recorded as of March 31, 2026 and December 31, 2025, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:

 Less Than 12 Months12 Months or MoreTotal
(In thousands)Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale
March 31, 2026
U.S. Government agencies$1,366 $(1)$43,816 $(572)$45,182 $(573)
Mortgage-backed securities42,374 (441)1,608,061 (190,081)1,650,435 (190,522)
State and political subdivisions15,025 (1,070)802,113 (200,477)817,138 (201,547)
Other securities2,000 (1)89,321 (5,255)91,321 (5,256)
Total AFS$60,765 $(1,513)$2,543,311 $(396,385)$2,604,076 $(397,898)
December 31, 2025
U.S. Government agencies$2,247 $(17)$43,767 $(603)$46,014 $(620)
Mortgage-backed securities15,305 (74)1,672,723 (189,686)1,688,028 (189,760)
State and political subdivisions5,757 (969)824,265 (186,123)830,022 (187,092)
Other securities— — 96,176 (5,445)96,176 (5,445)
Total AFS$23,309 $(1,060)$2,636,931 $(381,857)$2,660,240 $(382,917)
Schedule of Debt Securities, Allowance for Credit Loss Activity in the allowance for credit losses by investment security type for the three months ended March 31, 2025 on the Company’s HTM securities portfolio was as follows:
(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended March 31, 2025
Held-to-maturity
Beginning balance, January 1, 2025$196 $3,018 $3,214 
Provision for credit loss expense— — — 
Net (decrease) increase in allowance on previously impaired securities(25)25 — 
Ending balance, March 31, 2025$171 $3,043 $3,214 
Schedule of Income Earned on Securities
Income earned on securities for the three months ended March 31, 2026 and 2025, is as follows:

Three Months Ended
March 31,
(In thousands)20262025
Taxable:  
Held-to-maturity$— $10,399 
Available-for-sale26,311 21,185 
Non-taxable:
Held-to-maturity— 10,051 
Available-for-sale5,571 5,622 
Total$31,882 $47,257 
Schedule of Amortized Cost and Estimated Fair Value by Maturity of Securities
The amortized cost and estimated fair value by maturity of AFS securities as of March 31, 2026 are shown in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities. 

 Available-for-Sale
(In thousands)Amortized
Cost		Fair
Value
One year or less$9,044 $8,945 
After one through five years99,070 98,511 
After five through ten years105,605 99,700 
After ten years1,016,912 816,200 
Securities not due on a single maturity date2,317,158 2,128,732 
Other securities (no maturity)198 198 
Total$3,547,987 $3,152,286