Loans and Allowance for Credit Losses (Schedule of Credit Exposure for Loans Based on Original LTV and FICO Score) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss and Fee	$ 24,633,684	$ 24,885,988
1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	365,323	1,201,204
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,126,812	3,169,085
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,974,506	922,591
Financing Receivable, Originated Three Years before Latest Fiscal Year	860,121	320,683
Financing Receivable, Originated Four Years before Latest Fiscal Year	297,728	182,814
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,278,523	1,332,457
Financing Receivable, before Allowance for Credit Loss and Fee	6,903,013	7,128,834
FICO, 760 or greater | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	253,774	805,125
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	810,150	2,513,045
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,378,572	721,982
Financing Receivable, Originated Three Years before Latest Fiscal Year	696,363	212,574
Financing Receivable, Originated Four Years before Latest Fiscal Year	203,966	97,076
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	893,290	944,783
Financing Receivable, before Allowance for Credit Loss and Fee	5,236,115	5,294,585
FICO, 720 to 759 | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	78,882	285,507
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	194,135	485,528
Financing Receivable, Originated Two Years before Latest Fiscal Year	392,179	132,928
Financing Receivable, Originated Three Years before Latest Fiscal Year	99,412	62,301
Financing Receivable, Originated Four Years before Latest Fiscal Year	50,984	45,857
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	210,663	216,047
Financing Receivable, before Allowance for Credit Loss and Fee	1,026,255	1,228,168
FICO, 719 or less | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	32,667	110,572
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	122,527	170,512
Financing Receivable, Originated Two Years before Latest Fiscal Year	203,755	67,681
Financing Receivable, Originated Three Years before Latest Fiscal Year	64,346	45,808
Financing Receivable, Originated Four Years before Latest Fiscal Year	42,778	39,881
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	174,570	171,627
Financing Receivable, before Allowance for Credit Loss and Fee	640,643	606,081
Less than 61% [Member] | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	63,117	282,940
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	260,403	1,301,279
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,211,101	354,720
Financing Receivable, Originated Three Years before Latest Fiscal Year	326,771	76,404
Financing Receivable, Originated Four Years before Latest Fiscal Year	72,219	42,864
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	428,451	472,090
Financing Receivable, before Allowance for Credit Loss and Fee	2,362,062	2,530,297
61% - 70% [Member] | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	67,146	295,206
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	280,602	857,008
Financing Receivable, Originated Two Years before Latest Fiscal Year	813,682	231,732
Financing Receivable, Originated Three Years before Latest Fiscal Year	221,091	80,383
Financing Receivable, Originated Four Years before Latest Fiscal Year	71,652	49,047
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	293,784	310,649
Financing Receivable, before Allowance for Credit Loss and Fee	1,747,957	1,824,025
71% - 80% [Member] | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	235,060	620,049
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	583,724	975,542
Financing Receivable, Originated Two Years before Latest Fiscal Year	915,166	336,066
Financing Receivable, Originated Three Years before Latest Fiscal Year	312,188	158,406
Financing Receivable, Originated Four Years before Latest Fiscal Year	148,483	86,463
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	519,699	510,633
Financing Receivable, before Allowance for Credit Loss and Fee	2,714,320	2,687,159
More than 81% [Member] | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	3,009
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,083	35,256
Financing Receivable, Originated Two Years before Latest Fiscal Year	34,557	73
Financing Receivable, Originated Three Years before Latest Fiscal Year	71	5,490
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,374	4,440
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,589	39,085
Financing Receivable, before Allowance for Credit Loss and Fee	78,674	87,353
30 - 59 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss and Fee	207,256	210,634
30 - 59 Days Past Due | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,200	12,752
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,785	16,432
Financing Receivable, Originated Two Years before Latest Fiscal Year	7,201	3,266
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,745	2,953
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	1,854
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14,527	5,759
Financing Receivable, before Allowance for Credit Loss and Fee	31,458	43,016
60 - 89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss and Fee	75,877	104,171
60 - 89 Days Past Due | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	252
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,116	1,196
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,465	229
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	1,347
Financing Receivable, Originated Four Years before Latest Fiscal Year	143	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,728	1,052
Financing Receivable, before Allowance for Credit Loss and Fee	6,452	4,076
90 Days or More Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss and Fee	334,463	551,169
90 Days or More Past Due | 1-4 single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	2,589
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,872	2,158
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	2,173
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	360
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,439	3,069
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,580	4,635
Financing Receivable, before Allowance for Credit Loss and Fee	$ 12,891	$ 14,984