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Loans Held for Investment - Internal Risk Grading System (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans $ 13,450,840 $ 8,722,311
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   8,640,840
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   36,722
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   44,749
Investor loans secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 8,245,481 4,153,084
Investor loans secured by real estate | CRE non-owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,707,930 2,070,141
Investor loans secured by real estate | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 5,142,069 1,575,726
Investor loans secured by real estate | Construction and land    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 337,872 438,786
Investor loans secured by real estate | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 57,610 68,431
Investor loans secured by real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   4,147,989
Investor loans secured by real estate | Pass | CRE non-owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,700,363 2,067,875
Investor loans secured by real estate | Pass | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 5,141,510 1,575,510
Investor loans secured by real estate | Pass | Construction and land    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 336,977 438,769
Investor loans secured by real estate | Pass | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 52,555 65,835
Investor loans secured by real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   2,151
Investor loans secured by real estate | Special Mention | CRE non-owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 4,090 1,178
Investor loans secured by real estate | Special Mention | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   0
Investor loans secured by real estate | Special Mention | Construction and land    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   0
Investor loans secured by real estate | Special Mention | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   973
Investor loans secured by real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   2,944
Investor loans secured by real estate | Substandard | CRE non-owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 3,477 1,088
Investor loans secured by real estate | Substandard | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 559 216
Investor loans secured by real estate | Substandard | Construction and land    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 895 17
Investor loans secured by real estate | Substandard | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 5,055 1,623
Business loans secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,563,243 2,288,175
Business loans secured by real estate | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 84,126 88,381
Business loans secured by real estate | CRE owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,119,788 1,846,554
Business loans secured by real estate | Franchise real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 359,329 353,240
Business loans secured by real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   2,267,278
Business loans secured by real estate | Pass | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 77,971 83,106
Business loans secured by real estate | Pass | CRE owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,073,543 1,831,853
Business loans secured by real estate | Pass | Franchise real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 359,329 352,319
Business loans secured by real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   13,930
Business loans secured by real estate | Special Mention | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   1,842
Business loans secured by real estate | Special Mention | CRE owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 32,289 11,167
Business loans secured by real estate | Special Mention | Franchise real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   921
Business loans secured by real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   6,967
Business loans secured by real estate | Substandard | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 6,155 3,433
Business loans secured by real estate | Substandard | CRE owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 13,956 3,534
Business loans secured by real estate | Substandard | Franchise real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   0
Commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 2,353,723 1,975,053
Commercial loans | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 1,820,995 1,393,270
Commercial loans | Franchise non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 515,980 564,357
Commercial loans | SBA non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 16,748 17,426
Commercial loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   1,920,189
Commercial loans | Pass | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 1,708,175 1,359,662
Commercial loans | Pass | Franchise non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 484,500 546,594
Commercial loans | Pass | SBA non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 11,380 13,933
Commercial loans | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   20,641
Commercial loans | Special Mention | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 42,368 13,226
Commercial loans | Special Mention | Franchise non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   6,930
Commercial loans | Special Mention | SBA non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 1,661 485
Commercial loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   34,223
Commercial loans | Substandard | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 70,452 20,382
Commercial loans | Substandard | Franchise non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 31,480 10,833
Commercial loans | Substandard | SBA non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 3,707 3,008
Retail loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 288,393 305,999
Retail loans | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 243,359 255,024
Retail loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 45,034 50,975
Retail loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   305,384
Retail loans | Pass | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 242,373 254,463
Retail loans | Pass | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 44,991 50,921
Retail loans | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   0
Retail loans | Special Mention | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 57 0
Retail loans | Special Mention | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   0
Retail loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans   615
Retail loans | Substandard | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans 929 561
Retail loans | Substandard | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total gross loans $ 43 $ 54