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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Allowance for Credit Loss on Investments in Debt Securities
The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables:
September 30, 2025
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,183,001 $1,323 $(122,177)$1,062,147 
Obligations of states and political subdivisions240,306 64 (22,771)217,599 
Corporate bonds4,944 2 (66)4,880 
Asset backed securities280,761 321 (1,718)279,364 
Non-agency collateralized mortgage obligations197,949 240 (21,423)176,766 
Total debt securities available for sale$1,906,961 $1,950 $(168,155)$1,740,756 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$93,882 $3 $(4,138)89,747 
Obligations of states and political subdivisions1,564 — (12)1,552 
Total debt securities held to maturity$95,446 $3 $(4,150)$91,299 
December 31, 2024
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,268,654 $16 $(174,485)$1,094,185 
Obligations of states and political subdivisions249,627 66 (28,949)220,744 
Corporate bonds6,182 — (345)5,837 
Asset backed securities314,814 687 (1,238)314,263 
Non-agency collateralized mortgage obligations299,256 238 (29,638)269,856 
Total debt securities available for sale$2,138,533 $1,007 $(234,655)$1,904,885 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$109,155 $3 $(7,443)$101,715 
Obligations of states and political subdivisions2,711 2 (79)2,634 
Total debt securities held to maturity$111,866 $5 $(7,522)$104,349 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of September 30, 2025, the contractual final maturity for available for sale and held to maturity investment securities is as follows:
Debt SecuritiesAvailable for SaleHeld to Maturity
(in thousands)Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
Due in one year$117 $117 $— $— 
Due after one year through five years62,087 60,420 2,511 2,475 
Due after five years through ten years158,524 148,757 91,981 87,905 
Due after ten years1,686,233 1,531,462 954 919 
Totals$1,906,961 $1,740,756 $95,446 $91,299 
Gross Unrealized Losses on Investment Securities
Gross unrealized losses on debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
September 30, 2025:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$24,696 $(292)$938,888 $(121,885)$963,584 $(122,177)
Obligations of states and political subdivisions4,090 (123)206,521 (22,648)210,611 (22,771)
Corporate bonds497 (1)2,650 (65)3,147 (66)
Asset backed securities24,169 (128)71,006 (1,590)95,175 (1,718)
Non-agency collateralized mortgage obligations10,683 (4)134,864 (21,419)145,547 (21,423)
Total debt securities available for sale$64,135 $(548)$1,353,929 $(167,607)$1,418,064 $(168,155)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $89,587 $(4,138)$89,587 $(4,138)
Obligations of states and political subdivisions— — 1,552 (12)1,552 (12)
Total debt securities held to maturity$— $— $91,139 $(4,150)$91,139 $(4,150)
December 31, 2024:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$63,714 $(842)$1,021,654 $(173,643)$1,085,368 $(174,485)
Obligations of states and political subdivisions7,457 (140)208,063 (28,809)215,520 (28,949)
Corporate bonds1,229 (17)4,608 (328)5,837 (345)
Asset backed securities44,707 (30)75,734 (1,208)120,441 (1,238)
Non-agency collateralized mortgage obligations— — 236,671 (29,638)236,671 (29,638)
Total debt securities available for sale$117,107 $(1,029)$1,546,730 $(233,626)$1,663,837 $(234,655)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $101,553 $(7,443)$101,553 $(7,443)
Obligations of states and political subdivisions— — 1,485 (79)1,485 (79)
Total debt securities held to maturity$— $— $103,038 $(7,522)$103,038 $(7,522)
Amortized Cost of Debt Securities Held-to-Maturity The following table summarizes the amortized cost of debt securities held-to-maturity at the dates indicated, aggregated by credit quality indicator:
September 30, 2025December 31, 2024
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$93,882 $— $109,155 $— 
Obligations of states and political subdivisions1,564 — 2,711 — 
Total debt securities held to maturity$95,446 $— $111,866 $—