Marketable Securities - Available For Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized cost
Residential mortgage-backed securities	$ 1,202,354	$ 1,240,003
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	484	223
Gross unrealized holding losses
Gross unrealized holding losses	(173,647)	(196,867)
Fair value
Fair value	1,029,191	1,043,359
U.S. government and agencies
Amortized cost
Due after one year through five years		20,000
Due after ten years	47,263	49,383
Gross unrealized holding gains
Due after one year through five years		0
Due after ten years	0	0
Gross unrealized holding losses
Due after one year through five years		(1,135)
Due after ten years	(10,292)	(9,934)
Fair value
Due after one year through five years		18,865
Due after ten years	36,971	39,449
Government-sponsored enterprises
Amortized cost
Due after one year through five years	185	45,986
Due after five years through ten years		386
Gross unrealized holding gains
Due after one year through five years	0	0
Due after five years through ten years		0
Gross unrealized holding losses
Due after one year through five years	(5)	(5,763)
Due after five years through ten years		(12)
Fair value
Due after one year through five years	180	40,223
Due after five years through ten years		374
Municipal securities
Amortized cost
Due after one year through five years	880	4,279
Due after five years through ten years	9,157	20,725
Due after ten years	58,872	60,762
Gross unrealized holding gains
Due after one year through five years	8	22
Due after five years through ten years	5	0
Due after ten years	13	125
Gross unrealized holding losses
Due after one year through five years	(3)	(427)
Due after five years through ten years	(1,565)	(1,437)
Due after ten years	(8,626)	(8,580)
Fair value
Due after one year through five years	885	3,874
Due after five years through ten years	7,597	19,288
Due after ten years	50,259	52,307
Corporate debt issues
Amortized cost
Due after five years through ten years	14,373	8,466
Due after ten years	3,250
Gross unrealized holding gains
Due after five years through ten years	20	0
Due after ten years	0
Gross unrealized holding losses
Due after five years through ten years	(886)	(778)
Due after ten years	0
Fair value
Due after five years through ten years	13,507	7,688
Due after ten years	3,250
Mortgage-backed securities
Amortized cost
Due after one year through five years	11,289
Due after five years through ten years	8,021
Due after ten years	1,048,990
Residential mortgage-backed securities	1,068,374	1,030,016
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	438	76
Gross unrealized holding losses
Gross unrealized holding losses	(152,270)	(168,801)
Fair value
Due after one year through five years	11,185
Due after five years through ten years	7,022
Due after ten years	898,260
Fair value	916,542	861,291
Fixed rate pass-through
Amortized cost
Residential mortgage-backed securities	228,855	209,069
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	83	27
Gross unrealized holding losses
Gross unrealized holding losses	(16,874)	(25,222)
Fair value
Fair value	212,064	183,874
Variable rate pass-through
Amortized cost
Residential mortgage-backed securities	4,093	7,140
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	24	11
Gross unrealized holding losses
Gross unrealized holding losses	(13)	(71)
Fair value
Fair value	4,104	7,080
Fixed rate agency CMOs
Amortized cost
Residential mortgage-backed securities	789,673	789,842
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	293	0
Gross unrealized holding losses
Gross unrealized holding losses	(135,258)	(143,055)
Fair value
Fair value	654,708	646,787
Variable rate agency CMOs
Amortized cost
Residential mortgage-backed securities	45,753	23,965
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	38	38
Gross unrealized holding losses
Gross unrealized holding losses	(125)	(453)
Fair value
Fair value	$ 45,666	$ 23,550