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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
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 $ 7,749,499  
2019 7,856,988  
2018 5,429,370  
2017 3,282,850  
2016 1,627,630  
Prior 3,277,666  
Revolving Loans Amortized Cost Basis 7,971,940  
Revolving Loans Converted to Term Loans Amortized Cost Basis 241,186  
Financing Receivable, before Allowance for Credit Loss, Total 37,437,129 $ 34,778,539
Commercial lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 6,111,501  
2019 5,936,417  
2018 3,820,977  
2017 2,178,394  
2016 1,059,094  
Prior 2,179,414  
Revolving Loans Amortized Cost Basis 6,664,095  
Revolving Loans Converted to Term Loans Amortized Cost Basis 28,800  
Financing Receivable, before Allowance for Credit Loss, Total 27,978,692 25,914,252
Commercial lending | Commercial and industrial (“C&I”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 3,493,072  
2019 1,897,219  
2018 807,846  
2017 398,196  
2016 80,202  
Prior 148,183  
Revolving Loans Amortized Cost Basis 6,470,571  
Revolving Loans Converted to Term Loans Amortized Cost Basis 9,735  
Financing Receivable, before Allowance for Credit Loss, Total 13,305,024 12,150,931
Commercial lending | Commercial and industrial (“C&I”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 3,445,214  
2019 1,746,325  
2018 674,022  
2017 361,648  
2016 72,914  
Prior 140,094  
Revolving Loans Amortized Cost Basis 5,954,875  
Revolving Loans Converted to Term Loans Amortized Cost Basis 9,735  
Financing Receivable, before Allowance for Credit Loss, Total 12,404,827  
Commercial lending | Commercial and industrial (“C&I”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 5,466  
2019 55,742  
2018 103,052  
2017 11,576  
2016 129  
Prior 2,085  
Revolving Loans Amortized Cost Basis 234,394  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 412,444  
Commercial lending | Commercial and industrial (“C&I”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 42,386  
2019 95,152  
2018 30,772  
2017 24,972  
2016 6,254  
Prior 6,004  
Revolving Loans Amortized Cost Basis 281,302  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 486,842  
Commercial lending | Commercial and industrial (“C&I”) | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 6  
2019 0  
2018 0  
2017 0  
2016 905  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 911  
Commercial lending | Commercial real estate (“CRE”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,803,460  
2019 2,828,723  
2018 2,340,184  
2017 1,388,621  
2016 786,573  
Prior 1,683,179  
Revolving Loans Amortized Cost Basis 188,182  
Revolving Loans Converted to Term Loans Amortized Cost Basis 19,065  
Financing Receivable, before Allowance for Credit Loss, Total 11,037,987 10,278,448
Commercial lending | Commercial real estate (“CRE”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,774,436  
2019 2,718,564  
2018 2,268,952  
2017 1,260,364  
2016 784,464  
Prior 1,559,165  
Revolving Loans Amortized Cost Basis 188,182  
Revolving Loans Converted to Term Loans Amortized Cost Basis 19,065  
Financing Receivable, before Allowance for Credit Loss, Total 10,573,192  
Commercial lending | Commercial real estate (“CRE”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 3,593  
2019 51,598  
2018 56,943  
2017 84,362  
2016 1,600  
Prior 81,431  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 279,527  
Commercial lending | Commercial real estate (“CRE”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 25,431  
2019 58,561  
2018 14,289  
2017 43,895  
2016 509  
Prior 42,583  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 185,268  
Commercial lending | Real estate loan | Multifamily residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 692,581  
2019 957,396  
2018 517,576  
2017 386,329  
2016 170,948  
Prior 327,102  
Revolving Loans Amortized Cost Basis 5,342  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 3,057,274 2,856,374
Commercial lending | Real estate loan | Multifamily residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 692,581  
2019 956,657  
2018 493,769  
2017 386,329  
2016 146,346  
Prior 318,675  
Revolving Loans Amortized Cost Basis 5,342  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 2,999,699  
Commercial lending | Real estate loan | Multifamily residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 24,602  
Prior 986  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 25,588  
Commercial lending | Real estate loan | Multifamily residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 739  
2018 23,807  
2017 0  
2016 0  
Prior 7,441  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 31,987  
Commercial lending | Construction and land    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 122,388  
2019 253,079  
2018 155,371  
2017 5,248  
2016 21,371  
Prior 20,950  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 578,407 628,499
Commercial lending | Construction and land | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 118,823  
2019 253,079  
2018 155,371  
2017 5,248  
2016 21,371  
Prior 1,158  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 555,050  
Commercial lending | Construction and land | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 3,565  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 19,792  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 23,357  
Commercial lending | Total CRE    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 2,618,429  
2019 4,039,198  
2018 3,013,131  
2017 1,780,198  
2016 978,892  
Prior 2,031,231  
Revolving Loans Amortized Cost Basis 193,524  
Revolving Loans Converted to Term Loans Amortized Cost Basis 19,065  
Financing Receivable, before Allowance for Credit Loss, Total 14,673,668 13,763,321
Consumer lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,637,998  
2019 1,920,571  
2018 1,608,393  
2017 1,104,456  
2016 568,536  
Prior 1,098,252  
Revolving Loans Amortized Cost Basis 1,307,845  
Revolving Loans Converted to Term Loans Amortized Cost Basis 212,386  
Financing Receivable, before Allowance for Credit Loss, Total 9,458,437 8,864,287
Consumer lending | Real estate loan | Single-family residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,619,709  
2019 1,916,492  
2018 1,605,048  
2017 1,089,509  
2016 562,604  
Prior 992,397  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 7,785,759 7,108,590
Consumer lending | Real estate loan | Single-family residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,619,709  
2019 1,916,265  
2018 1,603,227  
2017 1,086,999  
2016 561,422  
Prior 978,167  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 7,765,789  
Consumer lending | Real estate loan | Single-family residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 227  
2018 347  
2017 351  
2016 324  
Prior 3,474  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 4,723  
Consumer lending | Real estate loan | Single-family residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 1,474  
2017 2,159  
2016 858  
Prior 10,756  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 15,247  
Consumer lending | HELOCs    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 7  
2019 454  
2018 3,311  
2017 10,618  
2016 5,932  
Prior 21,676  
Revolving Loans Amortized Cost Basis 1,260,004  
Revolving Loans Converted to Term Loans Amortized Cost Basis 212,386  
Financing Receivable, before Allowance for Credit Loss, Total 1,514,388 1,472,783
Consumer lending | HELOCs | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 7  
2019 454  
2018 2,823  
2017 5,993  
2016 4,666  
Prior 18,891  
Revolving Loans Amortized Cost Basis 1,260,001  
Revolving Loans Converted to Term Loans Amortized Cost Basis 208,520  
Financing Receivable, before Allowance for Credit Loss, Total 1,501,355  
Consumer lending | HELOCs | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 3  
Revolving Loans Converted to Term Loans Amortized Cost Basis 637  
Financing Receivable, before Allowance for Credit Loss, Total 640  
Consumer lending | HELOCs | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 488  
2017 4,625  
2016 1,266  
Prior 2,785  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term Loans Amortized Cost Basis 3,229  
Financing Receivable, before Allowance for Credit Loss, Total 12,393  
Consumer lending | Total residential mortgage    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 1,619,716  
2019 1,916,946  
2018 1,608,359  
2017 1,100,127  
2016 568,536  
Prior 1,014,073  
Revolving Loans Amortized Cost Basis 1,260,004  
Revolving Loans Converted to Term Loans Amortized Cost Basis 212,386  
Financing Receivable, before Allowance for Credit Loss, Total 9,300,147 8,581,373
Consumer lending | Other consumer    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 18,282  
2019 3,625  
2018 34  
2017 4,329  
2016 0  
Prior 84,179  
Revolving Loans Amortized Cost Basis 47,841  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 158,290 282,914
Consumer lending | Other consumer | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 18,282  
2019 3,625  
2018 34  
2017 1,838  
2016 0  
Prior 84,179  
Revolving Loans Amortized Cost Basis 47,837  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total 155,795  
Consumer lending | Other consumer | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 2,491  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 4  
Revolving Loans Converted to Term Loans Amortized Cost Basis 0  
Financing Receivable, before Allowance for Credit Loss, Total $ 2,495  
Non-PCI Loans    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   34,555,668
Non-PCI Loans | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   33,582,886
Non-PCI Loans | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   515,702
Non-PCI Loans | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   440,105
Non-PCI Loans | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   16,975
Non-PCI Loans | Commercial lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   25,777,039
Non-PCI Loans | Commercial lending | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   24,836,765
Non-PCI Loans | Commercial lending | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   510,632
Non-PCI Loans | Commercial lending | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   412,667
Non-PCI Loans | Commercial lending | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   16,975
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   12,149,121
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   11,423,094
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   406,543
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   302,509
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   16,975
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,165,247
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,003,749
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   83,683
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   77,815
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   2,834,212
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   2,806,475
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   20,406
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   7,331
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Commercial lending | Construction and land    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   628,459
Non-PCI Loans | Commercial lending | Construction and land | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   603,447
Non-PCI Loans | Commercial lending | Construction and land | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Commercial lending | Construction and land | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   25,012
Non-PCI Loans | Commercial lending | Construction and land | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Commercial lending | Total CRE    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   13,627,918
Non-PCI Loans | Commercial lending | Total CRE | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   13,413,671
Non-PCI Loans | Commercial lending | Total CRE | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   104,089
Non-PCI Loans | Commercial lending | Total CRE | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   110,158
Non-PCI Loans | Commercial lending | Total CRE | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Consumer lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   8,778,629
Non-PCI Loans | Consumer lending | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   8,746,121
Non-PCI Loans | Consumer lending | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   5,070
Non-PCI Loans | Consumer lending | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   27,438
Non-PCI Loans | Consumer lending | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   7,028,979
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   7,012,522
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   2,278
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   14,179
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Consumer lending | HELOCs    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   1,466,736
Non-PCI Loans | Consumer lending | HELOCs | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   1,453,207
Non-PCI Loans | Consumer lending | HELOCs | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   2,787
Non-PCI Loans | Consumer lending | HELOCs | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,742
Non-PCI Loans | Consumer lending | HELOCs | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Consumer lending | Total residential mortgage    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   8,495,715
Non-PCI Loans | Consumer lending | Total residential mortgage | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   8,465,729
Non-PCI Loans | Consumer lending | Total residential mortgage | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   5,065
Non-PCI Loans | Consumer lending | Total residential mortgage | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   24,921
Non-PCI Loans | Consumer lending | Total residential mortgage | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
Non-PCI Loans | Consumer lending | Other consumer    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   282,914
Non-PCI Loans | Consumer lending | Other consumer | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   280,392
Non-PCI Loans | Consumer lending | Other consumer | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   5
Non-PCI Loans | Consumer lending | Other consumer | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   2,517
Non-PCI Loans | Consumer lending | Other consumer | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   222,871
PCD or PCI loans | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   211,635
PCD or PCI loans | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   11,236
PCD or PCI loans | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   137,213
PCD or PCI loans | Commercial lending | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   126,269
PCD or PCI loans | Commercial lending | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,944
PCD or PCI loans | Commercial lending | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   1,810
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   1,810
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”)    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   113,201
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   102,257
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,944
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   22,162
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   22,162
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Construction and land    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   40
PCD or PCI loans | Commercial lending | Construction and land | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   40
PCD or PCI loans | Commercial lending | Construction and land | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Construction and land | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Construction and land | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Total CRE    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   135,403
PCD or PCI loans | Commercial lending | Total CRE | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   124,459
PCD or PCI loans | Commercial lending | Total CRE | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Commercial lending | Total CRE | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   10,944
PCD or PCI loans | Commercial lending | Total CRE | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   85,658
PCD or PCI loans | Consumer lending | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   85,366
PCD or PCI loans | Consumer lending | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   292
PCD or PCI loans | Consumer lending | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   79,611
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   79,517
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   94
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | HELOCs    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   6,047
PCD or PCI loans | Consumer lending | HELOCs | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   5,849
PCD or PCI loans | Consumer lending | HELOCs | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | HELOCs | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   198
PCD or PCI loans | Consumer lending | HELOCs | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Total residential mortgage    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   85,658
PCD or PCI loans | Consumer lending | Total residential mortgage | Pass    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   85,366
PCD or PCI loans | Consumer lending | Total residential mortgage | Special Mention    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Total residential mortgage | Substandard    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   292
PCD or PCI loans | Consumer lending | Total residential mortgage | Doubtful    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   0
PCD or PCI loans | Consumer lending | Other consumer    
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Total   $ 0