Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets Measured on Recurring Basis

The following table sets forth the fair values and methods used for measuring the fair values of financial instruments on a recurring basis, except those for which the carrying values approximate fair values:

		Fair Value
Financial Instrument	Hierarchy	June 30, 2023		December 31, 2022
		(Dollars in thousands)
Marketable securities
Debt securities (available-for-sale)	Level 1	$	676,565	$	561,100
Mortgage loans held-for-sale, net	Level 2	$	158,746	$	229,513
Derivative and financial instruments, net (Note 17)
Interest rate lock commitments	Level 2	$	2,617	$	(1,678)
Forward sales of mortgage-backed securities	Level 2	$	2,712	$	(5,269)
Mandatory delivery forward loan sale commitments	Level 2	$	33	$	791
Best-effort delivery forward loan sale commitments	Level 2	$	—	$	1,976

Schedule of Debt Securities, Available-for-Sale

The estimated fair value, gross unrealized holding gains, gross unrealized holding losses and amortized cost for debt securities by major classification are as follows:

	June 30, 2023								December 31, 2022
	(Dollars in thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. Government	$	676,446	$	120	$	1	$	676,565	$	561,100	$	—	$	—	$	561,100
Total Debt Securities	$	676,446	$	120	$	1	$	676,565	$	561,100	$	—	$	—	$	561,100

Schedule of Fair Value of Senior Notes

The estimated values of the senior notes in the following table are based on Level 2 inputs, which primarily reflect estimated prices for our senior notes that were provided by multiple sources.

	June 30, 2023				December 31, 2022
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)
$300 million 3.850% Senior Notes due January 2030, net	$	298,076	$	261,448	$	297,949	$	246,236
$350 million 2.500% Senior Notes due January 2031, net	347,559		275,270		347,413		255,374
$500 million 6.000% Senior Notes due January 2043, net	491,234		448,648		491,120		414,017
$350 million 3.966% Senior Notes due August 2061, net	346,116		208,283		346,094		204,014
Total	$	1,482,985	$	1,193,649	$	1,482,576	$	1,119,641