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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Values of Investments Securities
The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables:
June 30, 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$1,271,105 $1 $(178,082)$1,093,024 
Obligations of states and political subdivisions251,954 85 (29,430)222,609 
Corporate bonds6,177 — (367)5,810 
Asset backed securities344,115 569 (1,504)343,180 
Non-agency collateralized mortgage obligations311,101 — (34,941)276,160 
Total debt securities available for sale$2,184,452 $655 $(244,324)$1,940,783 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$119,982 $3 $(8,880)111,105 
Obligations of states and political subdivisions2,691 1 (88)2,604 
Total debt securities held to maturity$122,673 $4 $(8,968)$113,709 

December 31, 2023
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,386,772 $2 $(165,037)$1,221,737 
Obligations of states and political subdivisions262,879 268 (26,772)236,375 
Corporate bonds6,173 — (571)5,602 
Asset backed securities359,214 255 (4,188)355,281 
Non-agency collateralized mortgage obligations369,287 — (35,778)333,509 
Total debt securities available for sale$2,384,325 $525 $(232,346)$2,152,504 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$130,823 $— $(8,331)$122,492 
Obligations of states and political subdivisions2,671 6 (43)2,634 
Total debt securities held to maturity$133,494 $6 $(8,374)$125,126 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of June 30, 2024, 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$15,715 $15,600 $— $— 
Due after one year through five years66,353 63,156 4,981 4,817 
Due after five years through ten years263,947 252,757 89,811 83,494 
Due after ten years1,838,437 1,609,270 27,881 25,398 
Totals$2,184,452 $1,940,783 $122,673 $113,709 
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:
June 30, 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$322 $(3)$1,092,549 $(178,079)$1,092,871 $(178,082)
Obligations of states and political subdivisions7,705 (225)208,951 (29,205)216,656 (29,430)
Corporate bonds— — 5,810 (367)5,810 (367)
Asset backed securities43,914 (72)101,081 (1,432)144,995 (1,504)
Non-agency collateralized mortgage obligations— — 276,160 (34,941)276,160 (34,941)
Total debt securities available for sale$51,941 $(300)$1,684,551 $(244,024)$1,736,492 $(244,324)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $110,872 $(8,880)$110,872 $(8,880)
Obligations of states and political subdivisions486 (23)991 (65)1,477 (88)
Total debt securities held to maturity$486 $(23)$111,863 $(8,945)$112,349 $(8,968)
December 31, 2023: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$224 $— $1,221,320 $(165,037)$1,221,544 $(165,037)
Obligations of states and political subdivisions6,229 (75)216,497 (26,697)222,726 (26,772)
Corporate bonds— — 5,602 (571)5,602 (571)
Asset backed securities15,928 (93)264,731 (4,095)280,659 (4,188)
Non-agency collateralized mortgage obligations44,276 (583)289,233 (35,195)333,509 (35,778)
Total debt securities available for sale$66,657 $(751)$1,997,383 $(231,595)$2,064,040 $(232,346)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $122,259 $(8,331)$122,259 $(8,331)
Obligations of states and political subdivisions— — 1,012 (43)1,012 (43)
Total debt securities held to maturity$— $— $123,271 $(8,374)$123,271 $(8,374)
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:
June 30, 2024December 31, 2023
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$119,982 $— $130,823 $— 
Obligations of states and political subdivisions2,691 — 2,671 — 
Total debt securities held to maturity$122,673 $— $133,494 $—