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Loans Receivable and Allowance for Credit Losses (Credit Risk Ratings and/or Vintage Years for Loans Held-for-Investment by Portfolio Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | $ 10,680,884 | $ 9,787,213
2020 | 6,294,357 | 6,816,315
2019 | 5,104,045 | 5,125,324
2018 | 3,678,223 | 3,167,275
2017 | 2,400,331 | 1,547,971
Prior | 3,686,038 | 3,277,221
Revolving Loans Amortized Cost Basis | 9,612,862 | 8,390,152
Revolving Loans Converted to Term Loans Amortized Cost Basis | 237,041 | 279,484
Loans held-for-investment | 41,693,781 | 38,390,955
Pass [Member] | Federal Housing Administration Loan |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Nonaccrual loans guaranteed by the FHA | 1,600 | 747
Commercial Lending |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 8,046,445 | 7,390,682
2020 | 4,177,452 | 5,000,429
2019 | 3,721,211 | 3,619,488
2018 | 2,590,956 | 2,129,478
2017 | 1,622,234 | 1,013,095
Prior | 2,486,373 | 2,244,535
Revolving Loans Amortized Cost Basis | 7,647,844 | 6,993,769
Revolving Loans Converted to Term Loans Amortized Cost Basis | 35,231 | 48,551
Loans held-for-investment | 30,327,746 | 28,440,027
Commercial Lending | C&I |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 4,026,214 | 4,034,455
2020 | 1,253,234 | 1,577,608
2019 | 701,797 | 562,750
2018 | 239,265 | 283,807
2017 | 156,829 | 75,933
Prior | 245,775 | 253,079
Revolving Loans Amortized Cost Basis | 7,498,652 | 6,814,607
Revolving Loans Converted to Term Loans Amortized Cost Basis | 28,842 | 29,487
Loans held-for-investment | 14,150,608 | 13,631,726
Commercial Lending | C&I | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 3,911,722 | 3,912,147
2020 | 1,133,085 | 1,477,740
2019 | 629,007 | 483,725
2018 | 187,195 | 245,594
2017 | 132,392 | 69,482
Prior | 225,326 | 245,615
Revolving Loans Amortized Cost Basis | 7,383,485 | 6,431,003
Revolving Loans Converted to Term Loans Amortized Cost Basis | 28,842 | 29,487
Loans held-for-investment | 13,631,054 | 12,894,793
Commercial Lending | C&I | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 85,036 | 120,183
2020 | 117,357 | 74,601
2019 | 72,277 | 56,785
2018 | 51,553 | 19,426
2017 | 15,136 | 1,487
Prior | 4,005 | 5,872
Revolving Loans Amortized Cost Basis | 115,167 | 324,640
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 460,531 | 602,994
Commercial Lending | C&I | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 29,456 | 2,125
2020 | 2,792 | 25,267
2019 | 513 | 22,240
2018 | 517 | 18,787
2017 | 9,301 | 4,964
Prior | 16,444 | 1,592
Revolving Loans Amortized Cost Basis | 0 | 58,964
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 59,023 | 133,939
Commercial Lending | CRE |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,867,598 | 2,344,108
2020 | 2,093,703 | 2,465,790
2019 | 2,239,696 | 2,396,262
2018 | 1,884,558 | 1,427,625
2017 | 1,150,285 | 734,788
Prior | 1,784,150 | 1,613,707
Revolving Loans Amortized Cost Basis | 128,668 | 173,267
Revolving Loans Converted to Term Loans Amortized Cost Basis | 6,389 | 19,064
Loans held-for-investment | 12,155,047 | 11,174,611
Commercial Lending | CRE | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,792,193 | 2,296,649
2020 | 2,090,503 | 2,402,136
2019 | 2,230,520 | 2,310,748
2018 | 1,863,481 | 1,328,251
2017 | 1,120,682 | 732,694
Prior | 1,727,862 | 1,529,681
Revolving Loans Amortized Cost Basis | 128,668 | 173,267
Revolving Loans Converted to Term Loans Amortized Cost Basis | 6,389 | 19,064
Loans held-for-investment | 11,960,298 | 10,792,490
Commercial Lending | CRE | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 71,055 | 47,459
2020 | 3,200 | 63,654
2019 | 9,176 | 43,447
2018 | 21,077 | 98,259
2017 | 24,851 | 2,094
Prior | 55,892 | 80,662
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 185,251 | 335,575
Commercial Lending | CRE | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 4,350 | 0
2020 | 0 | 0
2019 | 0 | 42,067
2018 | 0 | 1,115
2017 | 4,752 | 0
Prior | 396 | 3,364
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 9,498 | 46,546
Commercial Lending | Real estate loan | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 1,026,295 | 783,671
2020 | 726,772 | 784,324
2019 | 689,174 | 503,764
2018 | 441,663 | 418,046
2017 | 315,120 | 181,477
Prior | 456,057 | 356,821
Revolving Loans Amortized Cost Basis | 20,524 | 5,895
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 3,675,605 | 3,033,998
Commercial Lending | Real estate loan | Multifamily | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 1,026,295 | 783,671
2020 | 726,772 | 783,589
2019 | 688,453 | 479,959
2018 | 419,319 | 411,945
2017 | 308,087 | 181,213
Prior | 424,947 | 348,751
Revolving Loans Amortized Cost Basis | 20,524 | 5,895
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 3,614,397 | 2,995,023
Commercial Lending | Real estate loan | Multifamily | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 735
2019 | 721 | 22,330
2018 | 22,344 | 6,101
2017 | 7,033 | 264
Prior | 30,666 | 5,877
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 60,764 | 35,307
Commercial Lending | Real estate loan | Multifamily | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 1,475
2018 | 0 | 0
2017 | 0 | 0
Prior | 444 | 2,193
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 444 | 3,668
Commercial Lending | Construction and land |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 126,338 | 228,448
2020 | 103,743 | 172,707
2019 | 90,544 | 156,712
2018 | 25,470 | 0
2017 | 0 | 20,897
Prior | 391 | 20,928
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 346,486 | 599,692
Commercial Lending | Construction and land | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 122,983 | 224,924
2020 | 103,743 | 172,707
2019 | 90,544 | 156,712
2018 | 3,412 | 0
2017 | 0 | 20,897
Prior | 391 | 1,028
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 321,073 | 576,268
Commercial Lending | Construction and land | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 3,355 | 3,524
2020 | 0 | 0
2019 | 0 | 0
2018 | 22,058 | 0
2017 | 0 | 0
Prior | 0 | 19,900
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 25,413 | 23,424
Commercial Lending | Construction and land | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
2017 | 0 | 0
Prior | 0 | 0
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 0 | 0
Commercial Lending | Total CRE |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 4,020,231 | 3,356,227
2020 | 2,924,218 | 3,422,821
2019 | 3,019,414 | 3,056,738
2018 | 2,351,691 | 1,845,671
2017 | 1,465,405 | 937,162
Prior | 2,240,598 | 1,991,456
Revolving Loans Amortized Cost Basis | 149,192 | 179,162
Revolving Loans Converted to Term Loans Amortized Cost Basis | 6,389 | 19,064
Loans held-for-investment | 16,177,138 | 14,808,301
Consumer Lending |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,634,439 | 2,396,531
2020 | 2,116,905 | 1,815,886
2019 | 1,382,834 | 1,505,836
2018 | 1,087,267 | 1,037,797
2017 | 778,097 | 534,876
Prior | 1,199,665 | 1,032,686
Revolving Loans Amortized Cost Basis | 1,965,018 | 1,396,383
Revolving Loans Converted to Term Loans Amortized Cost Basis | 201,810 | 230,933
Loans held-for-investment | 11,366,035 | 9,950,928
Consumer Lending | Real estate loan | Single-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,616,958 | 2,385,853
2020 | 2,108,370 | 1,814,855
2019 | 1,378,138 | 1,502,472
2018 | 1,085,732 | 1,023,496
2017 | 769,545 | 525,283
Prior | 1,134,959 | 933,994
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 9,093,702 | 8,185,953
Consumer Lending | Real estate loan | Single-family | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,616,958 | 2,385,853
2020 | 2,108,370 | 1,813,200
2019 | 1,375,929 | 1,501,660
2018 | 1,079,030 | 1,021,707
2017 | 763,351 | 523,170
Prior | 1,127,516 | 921,714
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 9,071,154 | 8,167,304
Consumer Lending | Real estate loan | Single-family | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 1,429
2019 | 458 | 0
2018 | 2,813 | 0
2017 | 1,899 | 119
Prior | 3,212 | 1,034
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 8,382 | 2,582
Consumer Lending | Real estate loan | Single-family | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 226
2019 | 1,751 | 812
2018 | 3,889 | 1,789
2017 | 4,295 | 1,994
Prior | 4,231 | 11,246
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 14,166 | 16,067
Consumer Lending | HELOCs |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 648 | 1,131
2020 | 3,277 | 1,031
2019 | 4,696 | 3,364
2018 | 1,535 | 9,980
2017 | 6,811 | 9,593
Prior | 12,559 | 15,437
Revolving Loans Amortized Cost Basis | 1,913,485 | 1,330,247
Revolving Loans Converted to Term Loans Amortized Cost Basis | 201,810 | 230,933
Loans held-for-investment | 2,144,821 | 1,601,716
Consumer Lending | HELOCs | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 648 | 1,131
2020 | 3,277 | 880
2019 | 4,644 | 2,879
2018 | 1,347 | 5,363
2017 | 3,268 | 8,433
Prior | 11,215 | 13,475
Revolving Loans Amortized Cost Basis | 1,913,478 | 1,328,919
Revolving Loans Converted to Term Loans Amortized Cost Basis | 197,414 | 225,810
Loans held-for-investment | 2,135,291 | 1,586,890
Consumer Lending | HELOCs | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 200
2018 | 0 | 0
2017 | 0 | 996
Prior | 371 | 0
Revolving Loans Amortized Cost Basis | 7 | 1,328
Revolving Loans Converted to Term Loans Amortized Cost Basis | 708 | 606
Loans held-for-investment | 1,086 | 3,130
Consumer Lending | HELOCs | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 151
2019 | 52 | 285
2018 | 188 | 4,617
2017 | 3,543 | 164
Prior | 973 | 1,962
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 3,688 | 4,517
Loans held-for-investment | 8,444 | 11,696
Consumer Lending | Total residential mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2,617,606 | 2,386,984
2020 | 2,111,647 | 1,815,886
2019 | 1,382,834 | 1,505,836
2018 | 1,087,267 | 1,033,476
2017 | 776,356 | 534,876
Prior | 1,147,518 | 949,431
Revolving Loans Amortized Cost Basis | 1,913,485 | 1,330,247
Revolving Loans Converted to Term Loans Amortized Cost Basis | 201,810 | 230,933
Loans held-for-investment | 11,238,523 | 9,787,669
Consumer Lending | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 16,833 | 9,547
2020 | 5,258 | 0
2019 | 0 | 0
2018 | 0 | 4,321
2017 | 1,741 | 0
Prior | 52,147 | 83,255
Revolving Loans Amortized Cost Basis | 51,533 | 66,136
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 127,512 | 163,259
Consumer Lending | Other consumer | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 16,831 | 9,531
2020 | 5,258 | 0
2019 | 0 | 0
2018 | 0 | 1,830
2017 | 1,741 | 0
Prior | 52,147 | 83,255
Revolving Loans Amortized Cost Basis | 51,481 | 66,136
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 127,458 | 160,752
Consumer Lending | Other consumer | Criticized (accrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 2 | 16
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
2017 | 0 | 0
Prior | 0 | 0
Revolving Loans Amortized Cost Basis | 0 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | 2 | 16
Consumer Lending | Other consumer | Criticized (nonaccrual) |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 2,491
2017 | 0 | 0
Prior | 0 | 0
Revolving Loans Amortized Cost Basis | 52 | 0
Revolving Loans Converted to Term Loans Amortized Cost Basis | 0 | 0
Loans held-for-investment | $ 52 | $ 2,491

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