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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments [Abstract]  
Aggregate Values And Unrealized Gains And Losses Of Investment Securities
The amortized cost and fair value of investment and marketable equity securities at December 31, 2021 and 2020, were as follows:
December 31, 2021
(Dollars in thousands)CostGross
unrealized
gains		Gross unrealized
losses		Fair
value
Investment securities available for sale
U.S. Treasury$2,006,788 $106 $1,924 $2,004,970 
Government agency797,725 4,659 3,624 798,760 
Residential mortgage-backed securities4,756,977 8,229 36,793 4,728,413 
Commercial mortgage-backed securities1,071,309 5,364 13,924 1,062,749 
Corporate bonds582,420 26,648 533 608,535 
Total investment securities available for sale9,215,219 45,006 56,798 9,203,427 
Investment in marketable equity securities72,894 24,879 245 97,528 
Investment securities held to maturity
Residential mortgage-backed securities 2,322,529 5,690 21,957 2,306,262 
Commercial mortgage-backed securities 1,484,916 32 33,568 1,451,380 
Other2,008 — — 2,008 
Total investment securities held to maturity3,809,453 5,722 55,525 3,759,650 
Total investment securities$13,097,566 $75,607 $112,568 $13,060,605 
December 31, 2020
CostGross
unrealized gains		Gross unrealized
losses		Fair
value
Investment securities available for sale
U.S. Treasury$499,832 $101 $— $499,933 
Government agency706,241 723 5,573 701,391 
Residential mortgage-backed securities4,369,130 70,283 1,310 4,438,103 
Commercial mortgage-backed securities745,892 25,645 — 771,537 
Corporate bonds590,870 14,437 2,028 603,279 
Total investment securities available for sale6,911,965 111,189 8,911 7,014,243 
Investment in marketable equity securities84,837 8,654 1,811 91,680 
Investment securities held to maturity
Residential mortgage-backed securities 1,877,692 17,689 — 1,895,381 
Commercial mortgage-backed securities 937,034 3,884 56 940,862 
Other2,256 — — 2,256 
Total investment securities held to maturity2,816,982 21,573 56 2,838,499 
Total investment securities$9,813,784 $141,416 $10,778 $9,944,422 
Investment Securities Maturity Information
The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Residential and commercial mortgage-backed and government agency securities are stated separately as they are not due at a single maturity date.
 December 31, 2021December 31, 2020
(Dollars in thousands)Amortized costFair
value		Amortized costFair
value
Investment securities available for sale
Non-amortizing securities maturing in:
One year or less$200 $202 $500,846 $500,954 
One through five years2,049,068 2,048,259 72,565 73,881 
Five through 10 years523,290 547,912 508,320 519,570 
Over 10 years16,650 17,132 8,971 8,807 
Government agency797,725 798,760 706,241 701,391 
Residential mortgage-backed securities4,756,977 4,728,413 4,369,130 4,438,103 
Commercial mortgage-backed securities1,071,309 1,062,749 745,892 771,537 
Total investment securities available for sale$9,215,219 $9,203,427 $6,911,965 $7,014,243 
Investment securities held to maturity
Non-amortizing securities maturing in:
One year or less$2,008 $2,008 $1,507 $1,507 
One through five years— — 749 749 
Residential mortgage-backed securities 2,322,529 2,306,262 1,877,692 1,895,381 
Commercial mortgage-backed securities 1,484,916 1,451,380 937,034 940,862 
Total investment securities held to maturity$3,809,453 $3,759,650 $2,816,982 $2,838,499 
Securities Gains (Losses)
For each year presented, realized gains on investment securities available for sale included the following:
 Year ended December 31
(Dollars in thousands)202120202019
Gross gains on retirement/sales of investment securities available for sale$33,133 $60,932 $8,993 
Gross losses on sales of investment securities available for sale(14)(679)(1,878)
Realized gains on investment securities available for sale, net$33,119 $60,253 $7,115 
Schedule of Realized and Unrealized Gains or Losses on Marketable Equity Securities
For each year presented, realized and unrealized gains or losses on marketable equity securities included the following:
Year ended December 31
(Dollars in thousands)202120202019
Marketable equity securities gains (losses), net$34,081 $29,395 $20,625 
Less net gains recognized on marketable equity securities sold16,261 44,550 16,344 
Unrealized gains (losses) recognized on marketable equity securities held$17,820 $(15,155)$4,281 
Investment Securities With Unrealized Losses
The following table provides information regarding investment securities with unrealized losses as of December 31, 2021 and 2020:
December 31, 2021
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment securities available for sale
U.S. Treasury$1,810,924 $1,924 $— $— $1,810,924 $1,924 
Government agency222,401 1,516 189,935 2,108 412,336 3,624 
Residential mortgage-backed securities3,992,305 36,769 1,351 24 3,993,656 36,793 
Commercial mortgage-backed securities647,101 13,924 — — 647,101 13,924 
Corporate bonds52,331 533 — — 52,331 533 
Total$6,725,062 $54,666 $191,286 $2,132 $6,916,348 $56,798 
December 31, 2020
Less than 12 months12 months or moreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment securities available for sale
Government agency$268,622 $3,197 $328,777 $2,376 $597,399 $5,573 
Residential mortgage-backed securities433,816 1,241 23,064 69 456,880 1,310 
Corporate bonds57,715 2,028 — — 57,715 2,028 
Total$760,153 $6,466 $351,841 $2,445 $1,111,994 $8,911