Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 833,598	$ 349,545
Gross Unrealized (Losses), Less than 12 Months	(3,249)	(3,485)
Estimated Fair Value, 12 Months or More	1,502,764	2,758,879
Gross Unrealized (Losses), 12 Months or More	(110,379)	(263,507)
Estimated Fair Value, Total	2,336,362	3,108,424
Gross Unrealized (Losses), Total	(113,628)	(266,992)
US Treasury Securities [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	172,955	29,042
Gross Unrealized (Losses), Less than 12 Months	(246)	(26)
Estimated Fair Value, 12 Months or More	28,804	372,368
Gross Unrealized (Losses), 12 Months or More	(650)	(23,811)
Estimated Fair Value, Total	201,759	401,410
Gross Unrealized (Losses), Total	(896)	(23,837)
U.S. Government Agency Obligations [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	0	0
Gross Unrealized (Losses), Less than 12 Months	0	0
Estimated Fair Value, 12 Months or More	0	5,791
Gross Unrealized (Losses), 12 Months or More	0	(416)
Estimated Fair Value, Total	0	5,791
Gross Unrealized (Losses), Total	0	(416)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	15,142	9,381
Gross Unrealized (Losses), Less than 12 Months	(339)	(172)
Estimated Fair Value, 12 Months or More	25,205	25,967
Gross Unrealized (Losses), 12 Months or More	(3,458)	(2,938)
Estimated Fair Value, Total	40,347	35,348
Gross Unrealized (Losses), Total	(3,797)	(3,110)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	645,501	309,466
Gross Unrealized (Losses), Less than 12 Months	(2,664)	(3,274)
Estimated Fair Value, 12 Months or More	542,530	1,311,865
Gross Unrealized (Losses), 12 Months or More	(45,177)	(176,421)
Estimated Fair Value, Total	1,188,031	1,621,331
Gross Unrealized (Losses), Total	(47,841)	(179,695)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	0	0
Gross Unrealized (Losses), Less than 12 Months	0	0
Estimated Fair Value, 12 Months or More	128,759	230,368
Gross Unrealized (Losses), 12 Months or More	(10,193)	(16,115)
Estimated Fair Value, Total	128,759	230,368
Gross Unrealized (Losses), Total	(10,193)	(16,115)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	0	1,656
Gross Unrealized (Losses), Less than 12 Months	0	(13)
Estimated Fair Value, 12 Months or More	777,466	812,520
Gross Unrealized (Losses), 12 Months or More	(50,901)	(43,806)
Estimated Fair Value, Total	777,466	814,176
Gross Unrealized (Losses), Total	$ (50,901)	$ (43,819)