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Loans and Leases Held for Investment and Credit Quality - Impaired Loans and Leases With Associated Reserves and No Associated Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance $ 55,399  
Recorded Investment, With No Recorded Allowance 2,108  
Recorded Investment, Total 57,507  
Loans, Unpaid Principal Balance 58,834  
Loans, Related Allowance Recorded 6,821  
Loans, Average Balance 56,058 $ 37,162
Loans, Interest Income Recognized 1,624 616
Commercial & Industrial    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 14,047  
Recorded Investment, With No Recorded Allowance 5  
Recorded Investment, Total 14,052  
Loans, Unpaid Principal Balance 14,884  
Loans, Related Allowance Recorded 3,989  
Loans, Average Balance 13,058 8,032
Loans, Interest Income Recognized 196 106
Commercial & Industrial | Small Business Banking    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 11,607  
Recorded Investment, With No Recorded Allowance 5  
Recorded Investment, Total 11,612  
Loans, Unpaid Principal Balance 12,577  
Loans, Related Allowance Recorded 1,967  
Loans, Average Balance 10,809 7,264
Loans, Interest Income Recognized 137 66
Commercial & Industrial | Specialty Lending    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 2,440  
Recorded Investment, Total 2,440  
Loans, Unpaid Principal Balance 2,307  
Loans, Related Allowance Recorded 2,022  
Loans, Average Balance 2,249 768
Loans, Interest Income Recognized 59 40
Construction & Development    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 719  
Recorded Investment, Total 719  
Loans, Unpaid Principal Balance 706  
Loans, Related Allowance Recorded 17  
Loans, Average Balance 722 4,951
Loans, Interest Income Recognized 15 15
Construction & Development | Small Business Banking    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 719  
Recorded Investment, Total 719  
Loans, Unpaid Principal Balance 706  
Loans, Related Allowance Recorded 17  
Loans, Average Balance 722 4,951
Loans, Interest Income Recognized 15 15
Commercial Real Estate    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 23,286  
Recorded Investment, With No Recorded Allowance 2,103  
Recorded Investment, Total 25,389  
Loans, Unpaid Principal Balance 25,845  
Loans, Related Allowance Recorded 2,067  
Loans, Average Balance 24,851 15,693
Loans, Interest Income Recognized 642 423
Commercial Real Estate | Small Business Banking    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 21,370  
Recorded Investment, With No Recorded Allowance 2,103  
Recorded Investment, Total 23,473  
Loans, Unpaid Principal Balance 23,996  
Loans, Related Allowance Recorded 2,055  
Loans, Average Balance 22,996 15,693
Loans, Interest Income Recognized 632 423
Commercial Real Estate | Specialty Lending    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 1,916  
Recorded Investment, Total 1,916  
Loans, Unpaid Principal Balance 1,849  
Loans, Related Allowance Recorded 12  
Loans, Average Balance 1,855  
Loans, Interest Income Recognized 10  
Commercial Land    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 17,347  
Recorded Investment, Total 17,347  
Loans, Unpaid Principal Balance 17,399  
Loans, Related Allowance Recorded 748  
Loans, Average Balance 17,427 8,486
Loans, Interest Income Recognized 771 72
Commercial Land | Small Business Banking    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With a Recorded Allowance 17,347  
Recorded Investment, Total 17,347  
Loans, Unpaid Principal Balance 17,399  
Loans, Related Allowance Recorded 748  
Loans, Average Balance 17,427 8,486
Loans, Interest Income Recognized $ 771 $ 72