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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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, 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$1,234,038 $76 $(132,117)$1,101,997 
Obligations of states and political subdivisions249,709 159 (20,526)229,342 
Corporate bonds6,179 20 (335)5,864 
Asset backed securities364,561 492 (1,513)363,540 
Non-agency collateralized mortgage obligations305,221 352 (27,046)278,527 
Total debt securities available for sale$2,159,708 $1,099 $(181,537)$1,979,270 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$114,558 $4 $(5,253)109,309 
Obligations of states and political subdivisions2,701 6 (29)2,678 
Total debt securities held to maturity$117,259 $10 $(5,282)$111,987 

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 September 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$6,625 $6,421 $1,137 $1,143 
Due after one year through five years62,174 60,553 3,453 3,361 
Due after five years through ten years239,924 231,415 87,693 83,990 
Due after ten years1,850,985 1,680,881 24,976 23,493 
Totals$2,159,708 $1,979,270 $117,259 $111,987 
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, 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$7 $(1)$1,092,624 $(132,116)$1,092,631 $(132,117)
Obligations of states and political subdivisions— — 216,428 (20,526)216,428 (20,526)
Corporate bonds— — 4,598 (335)4,598 (335)
Asset backed securities107,510 (164)109,099 (1,349)216,609 (1,513)
Non-agency collateralized mortgage obligations— — 245,023 (27,046)245,023 (27,046)
Total debt securities available for sale$107,517 $(165)$1,667,772 $(181,372)$1,775,289 $(181,537)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $109,144 $(5,253)$109,144 $(5,253)
Obligations of states and political subdivisions506 (3)1,029 (26)1,535 (29)
Total debt securities held to maturity$506 $(3)$110,173 $(5,279)$110,679 $(5,282)
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:
September 30, 2024December 31, 2023
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$114,558 $— $130,823 $— 
Obligations of states and political subdivisions2,701 — 2,671 — 
Total debt securities held to maturity$117,259 $— $133,494 $—