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Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due $ 13,529 $ 11,640
Financing Receivable, Recorded Investment, 90 Days Past Due 29,044 10,512
Total Past Due 42,573 22,152
Current 7,182,362 5,201,896
Financing Receivable, after Deferred Income Offset 7,224,935  
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 8,652 5,679
Financing Receivable, Recorded Investment, 90 Days Past Due 12,928 8,212
Total Past Due 21,580 13,891
Current 3,067,415 2,331,932
Financing Receivable, after Deferred Income Offset 3,088,995  
Commercial - investor owned    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 734 321
Financing Receivable, Recorded Investment, 90 Days Past Due 9,301 1,492
Total Past Due 10,035 1,813
Current 1,579,384 1,261,168
Financing Receivable, after Deferred Income Offset 1,589,419  
CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 328 562
Financing Receivable, Recorded Investment, 90 Days Past Due 4,647 213
Total Past Due 4,975 775
Current 1,493,433 677,747
Financing Receivable, after Deferred Income Offset 1,498,408  
Construction and land development    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 13 308
Financing Receivable, Recorded Investment, 90 Days Past Due 0 0
Total Past Due 13 308
Current 546,673 449,072
Financing Receivable, after Deferred Income Offset 546,686  
Residential real estate    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 2,071 4,689
Financing Receivable, Recorded Investment, 90 Days Past Due 2,118 595
Total Past Due 4,189 5,284
Current 314,990 349,908
Financing Receivable, after Deferred Income Offset 319,179  
Other    
Financing Receivable, Past Due [Line Items]    
30-89 Days Past Due 1,731 81
Financing Receivable, Recorded Investment, 90 Days Past Due 50 0
Total Past Due 1,781 81
Current 180,467 $ 132,069
Financing Receivable, after Deferred Income Offset $ 182,248