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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio
The following table summarizes the amortized cost and fair value of the available-for-sale and held-to-maturity investment securities portfolios and the corresponding amounts of gross unrealized gains, unrealized losses, and basis adjustments in AOCI and gross unrecognized gains and losses.
(dollars in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses
Basis
Adjustments (1)
Fair
Value
June 30, 2024    
Available-for-Sale    
U.S. Treasury$265,745 $8 $(10,940)$(49,505)$205,308 
U.S. government-sponsored entities and agencies1,442,132 — (187,768)(82,070)1,172,294 
Mortgage-backed securities - Agency5,571,763 2,244 (685,551)— 4,888,456 
States and political subdivisions550,897 121 (28,267)564 523,315 
Pooled trust preferred securities13,802 — (2,504)— 11,298 
Other securities324,169 216 (19,578)— 304,807 
Total available-for-sale securities$8,168,508 $2,589 $(934,608)$(131,011)$7,105,478 
Held-to-Maturity
U.S. government-sponsored entities and agencies$829,402 $— $(167,071)$— $662,331 
Mortgage-backed securities - Agency1,001,915 — (163,626)— 838,289 
States and political subdivisions1,155,282 469 (143,719)— 1,012,032 
Allowance for securities held-to-maturity(150)— — — (150)
Total held-to-maturity securities$2,986,449 $469 $(474,416)$— $2,512,502 
December 31, 2023
Available-for-Sale
U.S. Treasury$449,817 $154 $(11,941)$(41,297)$396,733 
U.S. government-sponsored entities and agencies1,487,879 33 (192,717)(63,931)1,231,264 
Mortgage-backed securities - Agency4,835,319 3,093 (621,852)— 4,216,560 
States and political subdivisions554,509 878 (23,057)2,930 535,260 
Pooled trust preferred securities13,797 — (2,460)— 11,337 
Other securities343,568 449 (22,116)— 321,901 
Total available-for-sale securities$7,684,889 $4,607 $(874,143)$(102,298)$6,713,055 
Held-to-Maturity
U.S. government-sponsored entities and agencies$825,953 $— $(154,827)$— $671,126 
Mortgage-backed securities - Agency1,029,131 — (147,137)— 881,994 
States and political subdivisions1,158,559 1,800 (112,141)— 1,048,218 
Allowance for securities held-to-maturity(150)— — — (150)
Total held-to-maturity securities$3,013,493 $1,800 $(414,105)$— $2,601,188 
(1)    Basis adjustments represent the amount of fair value hedging adjustments included in the carrying amounts of fixed-rate investment securities assets designated in fair value hedging arrangements. See Note 15 to the consolidated financial statements for additional information regarding these derivative financial instruments.
Schedule of Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-Sale Investment Securities and Other Securities
Proceeds from sales or calls of available-for-sale investment securities and the resulting realized gains and realized losses were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
(dollars in thousands)2024202320242023
Proceeds$287,075 $24,933 $348,325 $82,888 
Realized gains4 39 8 948 
Realized losses(2)(22)(22)(6,147)
Schedule of Expected Maturities of Investment Securities Portfolio Weighted average yield is based on amortized cost.
 June 30, 2024
(dollars in thousands)Amortized
Cost		Fair
Value		Weighted
Average
Yield
Maturity
Available-for-Sale   
Within one year$201,863 $199,144 3.31 %
One to five years2,465,325 2,302,561 3.73 
Five to ten years4,194,624 3,585,179 2.63 
Beyond ten years1,306,696 1,018,594 2.65 
Total$8,168,508 $7,105,478 2.98 %
Held-to-Maturity
Within one year$158 $148 2.19 %
One to five years164,614 134,416 2.59 
Five to ten years1,179,654 1,015,361 2.63 
Beyond ten years1,642,023 1,362,577 2.72 
Total$2,986,449 $2,512,502 2.68 %
Schedule of Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position
The following table summarizes the available-for-sale investment securities with unrealized losses for which an allowance for credit losses has not been recorded by aggregated major security type and length of time in a continuous unrealized loss position:
 Less than 12 months12 months or longerTotal
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized Losses
June 30, 2024
Available-for-Sale
U.S. Treasury$7,944 $(32)$187,270 $(10,908)$195,214 $(10,940)
U.S. government-sponsored entities
   and agencies		4,010 (67)1,168,284 (187,701)1,172,294 (187,768)
Mortgage-backed securities - Agency933,388 (6,678)3,625,425 (678,873)4,558,813 (685,551)
States and political subdivisions150,978 (1,977)317,112 (26,290)468,090 (28,267)
Pooled trust preferred securities— — 11,298 (2,504)11,298 (2,504)
Other securities26,624 (132)216,148 (19,446)242,772 (19,578)
Total available-for-sale$1,122,944 $(8,886)$5,525,537 $(925,722)$6,648,481 $(934,608)
December 31, 2023
Available-for-Sale
U.S. Treasury$8,937 $(42)$191,027 $(11,899)$199,964 $(11,941)
U.S. government-sponsored entities
   and agencies		— — 1,189,314 (192,717)1,189,314 (192,717)
Mortgage-backed securities - Agency90,145 (710)3,835,552 (621,142)3,925,697 (621,852)
States and political subdivisions86,865 (495)259,767 (22,562)346,632 (23,057)
Pooled trust preferred securities— — 11,337 (2,460)11,337 (2,460)
Other securities39,032 (229)255,888 (21,887)294,920 (22,116)
Total available-for-sale$224,979 $(1,476)$5,742,885 $(872,667)$5,967,864 $(874,143)
Schedule of Held-to-Maturity Investment Securities with Unrecognized Losses
The following table summarizes the held-to-maturity investment securities with unrecognized losses aggregated by major security type and length of time in a continuous loss position:
 Less than 12 months12 months or longerTotal
(dollars in thousands)Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
June 30, 2024
Held-to-Maturity
U.S. government-sponsored entities
   and agencies		$— $— $662,331 $(167,071)$662,331 $(167,071)
Mortgage-backed securities - Agency— — 838,289 (163,626)838,289 (163,626)
States and political subdivisions25,998 (231)942,639 (143,488)968,637 (143,719)
Total held-to-maturity$25,998 $(231)$2,443,259 $(474,185)$2,469,257 $(474,416)
December 31, 2023
Held-to-Maturity
U.S. government-sponsored entities
   and agencies		$— $— $671,126 $(154,827)$671,126 $(154,827)
Mortgage-backed securities - Agency— — 881,994 (147,137)881,994 (147,137)
States and political subdivisions— — 977,154 (112,141)977,154 (112,141)
Total held-to-maturity$— $— $2,530,274 $(414,105)$2,530,274 $(414,105)