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Loans Held for Investment and Allowance for Loan Losses - Loans by Credit Quality Grade (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 $ 1,725,334    
2019 5,485,025    
2018 3,022,483    
2017 2,220,584    
2016 938,513    
2015 and prior 7,204,413    
Revolving lines of credit 4,877,883    
Revolving lines of credit converted to term loans 135,650    
Total 25,609,885   $ 24,736,642
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 1,021,713    
2019 3,138,484    
2018 730,350    
2017 494,347    
2016 233,091    
2015 and prior 302,540    
Revolving lines of credit 3,201,050    
Revolving lines of credit converted to term loans 43,086    
Total 9,164,661 $ 10,230,828 9,133,444
Commercial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 995,901    
2019 3,094,437    
2018 677,757    
2017 409,424    
2016 193,252    
2015 and prior 259,128    
Revolving lines of credit 3,115,827    
Revolving lines of credit converted to term loans 37,322    
Total 8,783,048    
Commercial | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 15,204    
2019 16,219    
2018 29,464    
2017 52,773    
2016 15,860    
2015 and prior 10,715    
Revolving lines of credit 46,899    
Revolving lines of credit converted to term loans 4,009    
Total 191,143    
Commercial | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 10,608    
2019 19,213    
2018 22,743    
2017 20,754    
2016 21,662    
2015 and prior 10,605    
Revolving lines of credit 32,097    
Revolving lines of credit converted to term loans 1,582    
Total 139,264    
Commercial | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 8,615    
2018 386    
2017 11,396    
2016 2,317    
2015 and prior 22,092    
Revolving lines of credit 6,227    
Revolving lines of credit converted to term loans 173    
Total 51,206    
Energy      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 2,519    
2019 30,264    
2018 44,295    
2017 24,145    
2016 43,916    
2015 and prior 42,174    
Revolving lines of credit 955,193    
Revolving lines of credit converted to term loans 3,658    
Total 1,146,164 1,425,309
Energy | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 2,519    
2019 0    
2018 154    
2017 22,583    
2016 1,500    
2015 and prior 10,620    
Revolving lines of credit 785,048    
Revolving lines of credit converted to term loans 150    
Total 822,574    
Energy | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 11,000    
2018 23,571    
2017 0    
2016 15,989    
2015 and prior 15,771    
Revolving lines of credit 75,586    
Revolving lines of credit converted to term loans 0    
Total 141,917    
Energy | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 14,605    
2015 and prior 295    
Revolving lines of credit 62,899    
Revolving lines of credit converted to term loans 0    
Total 77,799    
Energy | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 19,264    
2018 20,570    
2017 1,562    
2016 11,822    
2015 and prior 15,488    
Revolving lines of credit 31,660    
Revolving lines of credit converted to term loans 3,508    
Total 103,874    
Mortgage finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 265,020    
2019 1,052,947    
2018 905,896    
2017 599,686    
2016 163,306    
2015 and prior 5,985,771    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 8,972,626 8,169,849 8,169,849
Mortgage finance | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 265,020    
2019 1,052,947    
2018 905,896    
2017 599,686    
2016 163,306    
2015 and prior 5,985,771    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 8,972,626    
Mortgage finance | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 0    
Mortgage finance | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 0    
Mortgage finance | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 0    
Real Estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 436,082    
2019 1,263,330    
2018 1,341,942    
2017 1,102,406    
2016 498,200    
2015 and prior 873,928    
Revolving lines of credit 721,640    
Revolving lines of credit converted to term loans 88,906    
Total 6,326,434 $ 3,444,701 $ 6,008,040
Real Estate | Commercial Real Estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 3,998,126    
Real Estate | Commercial Real Estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 193,894    
2019 852,283    
2018 951,771    
2017 805,322    
2016 273,234    
2015 and prior 567,932    
Revolving lines of credit 104,888    
Revolving lines of credit converted to term loans 36,350    
Total 3,785,674    
Real Estate | Commercial Real Estate | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 59,051    
2017 37,120    
2016 20,762    
2015 and prior 49,458    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 6,510    
Total 172,901    
Real Estate | Commercial Real Estate | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 4,036    
2017 0    
2016 0    
2015 and prior 34,024    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 1,250    
Total 39,310    
Real Estate | Commercial Real Estate | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 241    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 241    
Real Estate | Residential Homebuilder Finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,032,974    
Real Estate | Residential Homebuilder Finance | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 98,571    
2019 173,525    
2018 121,844    
2017 24,115    
2016 8,893    
2015 and prior 13,211    
Revolving lines of credit 591,953    
Revolving lines of credit converted to term loans 0    
Total 1,032,112    
Real Estate | Residential Homebuilder Finance | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 862    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 862    
Real Estate | Residential Homebuilder Finance | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 0    
Real Estate | Residential Homebuilder Finance | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 0    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 0    
Real Estate | Other Financing Receivable      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 936,594    
Real Estate | Other Financing Receivable | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 113,824    
2019 167,359    
2018 137,489    
2017 154,912    
2016 97,283    
2015 and prior 129,998    
Revolving lines of credit 19,974    
Revolving lines of credit converted to term loans 23,413    
Total 844,252    
Real Estate | Other Financing Receivable | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 3,578    
2018 7,486    
2017 11,894    
2016 6,218    
2015 and prior 25,234    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 7,283    
Total 61,693    
Real Estate | Other Financing Receivable | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 526    
2017 1,009    
2016 356    
2015 and prior 10,266    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 12,157    
Real Estate | Other Financing Receivable | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 574    
2018 0    
2017 0    
2016 783    
2015 and prior 3,035    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 14,100    
Total 18,492    
Real Estate | Secured by 1-4 family      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 358,740    
Real Estate | Secured by 1-4 family | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 29,793    
2019 65,149    
2018 59,560    
2017 67,208    
2016 90,671    
2015 and prior 38,410    
Revolving lines of credit 4,825    
Revolving lines of credit converted to term loans 0    
Total 355,616    
Real Estate | Secured by 1-4 family | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 179    
2017 0    
2016 0    
2015 and prior 1,792    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 1,971    
Real Estate | Secured by 1-4 family | Substandard-accruing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 826    
2016 0    
2015 and prior 109    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total 935    
Real Estate | Secured by 1-4 family | Non-accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
2015 and prior 218    
Revolving lines of credit 0    
Revolving lines of credit converted to term loans 0    
Total $ 218