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Loans and Allowance for Credit Losses (Schedule of Credit Exposure for Loans Based on Original LTV and FICO Score) (Details) - 1-4 single family residential - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year $ 177,126 $ 251,923
Originated, fiscal year before current fiscal year 223,571 307,640
Originated, two years before current fiscal year 256,322 1,021,656
Originated, three years before current fiscal year 952,244 2,767,773
Originated, four years before current Fiscal year 2,613,427 798,820
Originated, more than five years before current fiscal year 1,976,967 1,361,110
Total 6,199,657 6,508,922
760 or greater    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 126,736 179,256
Originated, fiscal year before current fiscal year 166,459 215,486
Originated, two years before current fiscal year 188,248 725,399
Originated, three years before current fiscal year 691,086 2,202,004
Originated, four years before current Fiscal year 2,090,460 642,572
Originated, more than five years before current fiscal year 1,435,230 952,136
Total 4,698,219 4,916,853
720 - 759    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 38,572 58,642
Originated, fiscal year before current fiscal year 37,598 59,356
Originated, two years before current fiscal year 39,888 173,309
Originated, three years before current fiscal year 146,065 365,198
Originated, four years before current Fiscal year 329,908 95,495
Originated, more than five years before current fiscal year 300,174 192,943
Total 892,205 944,943
719 or less or not available    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 11,818 14,025
Originated, fiscal year before current fiscal year 19,514 32,798
Originated, two years before current fiscal year 28,186 122,948
Originated, three years before current fiscal year 115,093 200,571
Originated, four years before current Fiscal year 193,059 60,753
Originated, more than five years before current fiscal year 241,563 216,031
Total 609,233 647,126
Less than 61%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 30,115 27,646
Originated, fiscal year before current fiscal year 26,649 51,565
Originated, two years before current fiscal year 44,261 236,020
Originated, three years before current fiscal year 216,616 1,124,532
Originated, four years before current Fiscal year 1,057,468 304,755
Originated, more than five years before current fiscal year 671,390 425,814
Total 2,046,499 2,170,332
61% - 70%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 30,797 33,033
Originated, fiscal year before current fiscal year 29,641 42,636
Originated, two years before current fiscal year 31,508 263,959
Originated, three years before current fiscal year 248,378 759,931
Originated, four years before current Fiscal year 726,409 203,423
Originated, more than five years before current fiscal year 470,259 307,052
Total 1,536,992 1,610,034
71% - 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 70,671 156,942
Originated, fiscal year before current fiscal year 133,550 175,651
Originated, two years before current fiscal year 148,580 518,164
Originated, three years before current fiscal year 483,789 851,427
Originated, four years before current Fiscal year 798,436 290,573
Originated, more than five years before current fiscal year 801,860 590,130
Total 2,436,886 2,582,887
More than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 45,543 34,302
Originated, fiscal year before current fiscal year 33,731 37,788
Originated, two years before current fiscal year 31,973 3,513
Originated, three years before current fiscal year 3,461 31,883
Originated, four years before current Fiscal year 31,114 69
Originated, more than five years before current fiscal year 33,458 38,114
Total 179,280 145,669
Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 175,175 251,767
Originated, fiscal year before current fiscal year 221,443 304,595
Originated, two years before current fiscal year 254,376 1,012,777
Originated, three years before current fiscal year 946,787 2,744,941
Originated, four years before current Fiscal year 2,596,718 798,346
Originated, more than five years before current fiscal year 1,950,163 1,340,402
Total 6,144,662 6,452,828
30 - 59 Days Past Due    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 1,658 0
Originated, fiscal year before current fiscal year 275 3,045
Originated, two years before current fiscal year 1,687 4,948
Originated, three years before current fiscal year 2,547 15,368
Originated, four years before current Fiscal year 11,126 474
Originated, more than five years before current fiscal year 15,702 9,140
Total 32,995 32,975
60 - 89 Days Past Due    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 144 156
Originated, fiscal year before current fiscal year 282 0
Originated, two years before current fiscal year 187 1,445
Originated, three years before current fiscal year 2,910 4,007
Originated, four years before current Fiscal year 931 0
Originated, more than five years before current fiscal year 2,574 547
Total 7,028 6,155
90 Days or More Past Due    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated current fiscal year 149 0
Originated, fiscal year before current fiscal year 1,571 0
Originated, two years before current fiscal year 72 2,486
Originated, three years before current fiscal year 0 3,457
Originated, four years before current Fiscal year 4,652 0
Originated, more than five years before current fiscal year 8,528 11,021
Total $ 14,972 $ 16,964