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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-Sale 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
September 30, 2023    
Available-for-Sale    
U.S. Treasury$616,608 $98 $(10,258)$(58,322)$548,126 
U.S. government-sponsored entities and agencies1,475,307 — (229,113)(103,294)1,142,900 
Mortgage-backed securities - Agency4,686,448 17 (823,760)— 3,862,705 
States and political subdivisions592,495 7 (47,058)(500)544,944 
Pooled trust preferred securities13,794 — (2,669)— 11,125 
Other securities335,292 112 (30,443)— 304,961 
Total available-for-sale securities$7,719,944 $234 $(1,143,301)$(162,116)$6,414,761 
Held-to-Maturity
U.S. government-sponsored entities and agencies$824,223 $— $(207,213)$— $617,010 
Mortgage-backed securities - Agency1,043,585 — (195,933)— 847,652 
States and political subdivisions1,160,256 — (231,147)— 929,109 
Allowance for securities held-to-maturity(150)— — — (150)
Total held-to-maturity securities$3,027,914 $— $(634,293)$— $2,393,621 
December 31, 2022
Available-for-Sale
U.S. Treasury$253,148 $5 $(5,189)$(47,037)$200,927 
U.S. government-sponsored entities and agencies1,451,736 — (169,248)(107,408)1,175,080 
Mortgage-backed securities - Agency4,986,354 976 (617,428)— 4,369,902 
States and political subdivisions688,159 1,789 (26,096)— 663,852 
Pooled trust preferred securities13,783 — (2,972)— 10,811 
Other securities379,423 258 (26,541)— 353,140 
Total available-for-sale securities$7,772,603 $3,028 $(847,474)$(154,445)$6,773,712 
Held-to-Maturity
U.S. government-sponsored entities and agencies$819,168 $— $(162,810)$— $656,358 
Mortgage-backed securities - Agency1,106,817 — (123,854)— 982,963 
States and political subdivisions1,163,312 221 (159,022)— 1,004,511 
Allowance for securities held-to-maturity(150)— — — (150)
Total held-to-maturity securities$3,089,147 $221 $(445,686)$— $2,643,682 
(1)    Basis adjustments represent the cumulative 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
September 30,		Nine Months Ended
September 30,
(dollars in thousands)2023202220232022
Proceeds$28,531 $5,221 $111,419 $78,568 
Realized gains54 17 1,002 528 
Realized losses(295)(189)(6,442)(443)
Expected Maturities of Investment Securities Portfolio Weighted average yield is based on amortized cost.
 September 30, 2023
(dollars in thousands)Amortized
Cost		Fair
Value		Weighted
Average
Yield
Maturity
Available-for-Sale   
Within one year$539,157 $535,193 4.71 %
One to five years1,567,565 1,395,867 2.80 
Five to ten years3,987,461 3,285,183 2.37 
Beyond ten years1,625,761 1,198,518 2.46 
Total$7,719,944 $6,414,761 2.64 %
Held-to-Maturity
One to five years$161,837 $127,716 2.68 %
Five to ten years954,756 797,284 2.64 
Beyond ten years1,911,321 1,468,621 2.71 
Total$3,027,914 $2,393,621 2.69 %
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
September 30, 2023
Available-for-Sale
U.S. Treasury$37,492 $(144)$178,540 $(10,114)$216,032 $(10,258)
U.S. government-sponsored entities
   and agencies		32,821 (58)1,110,079 (229,055)1,142,900 (229,113)
Mortgage-backed securities - Agency124,895 (5,798)3,736,306 (817,962)3,861,201 (823,760)
States and political subdivisions258,362 (7,749)260,563 (39,309)518,925 (47,058)
Pooled trust preferred securities— — 11,125 (2,669)11,125 (2,669)
Other securities11,737 (323)262,912 (30,120)274,649 (30,443)
Total available-for-sale$465,307 $(14,072)$5,559,525 $(1,129,229)$6,024,832 $(1,143,301)
December 31, 2022
Available-for-Sale
U.S. Treasury$130,967 $(3,264)$66,992 $(1,925)$197,959 $(5,189)
U.S. government-sponsored entities
   and agencies		454,854 (75,795)720,226 (93,453)1,175,080 (169,248)
Mortgage-backed securities - Agency3,207,319 (358,507)1,116,205 (258,921)4,323,524 (617,428)
States and political subdivisions414,813 (25,555)2,703 (541)417,516 (26,096)
Pooled trust preferred securities— — 10,811 (2,972)10,811 (2,972)
Other securities257,775 (17,045)75,309 (9,496)333,084 (26,541)
Total available-for-sale$4,465,728 $(480,166)$1,992,246 $(367,308)$6,457,974 $(847,474)
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
September 30, 2023
Held-to-Maturity
U.S. government-sponsored entities
   and agencies		$— $— $617,010 $(207,213)$617,010 $(207,213)
Mortgage-backed securities - Agency— — 847,652 (195,933)847,652 (195,933)
States and political subdivisions64,441 (4,877)864,668 (226,270)929,109 (231,147)
Total held-to-maturity$64,441 $(4,877)$2,329,330 $(629,416)$2,393,771 $(634,293)
December 31, 2022
Held-to-Maturity
U.S. government-sponsored entities
   and agencies		$354,293 $(110,523)$302,066 $(52,287)$656,359 $(162,810)
Mortgage-backed securities - Agency367,849 (42,438)615,114 (81,416)982,963 (123,854)
States and political subdivisions838,689 (127,355)135,573 (31,667)974,262 (159,022)
Total held-to-maturity$1,560,831 $(280,316)$1,052,753 $(165,370)$2,613,584 $(445,686)