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Loans and Leases Held for Investment and Credit Quality - Loan Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period $ 0  
Percentage of total class of financing receivable   2.67%
Small Business Banking    
Financing Receivable Modifications [Line Items]    
Percentage of total class of financing receivable   0.07%
Specialty Lending    
Financing Receivable Modifications [Line Items]    
Percentage of total class of financing receivable   0.25%
Energy & Infrastructure    
Financing Receivable Modifications [Line Items]    
Percentage of total class of financing receivable   2.35%
Other-Than-Insignificant Payment Delay    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   $ 4,183,000
Other-Than-Insignificant Payment Delay | Small Business Banking    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   0
Other-Than-Insignificant Payment Delay | Specialty Lending    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   4,183,000
Other-Than-Insignificant Payment Delay | Energy & Infrastructure    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   0
Term Extension    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   13,517,000
Term Extension | Small Business Banking    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   0
Term Extension | Specialty Lending    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   0
Term Extension | Energy & Infrastructure    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   13,517,000
Interest Rate Reduction    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   3,436,000
Interest Rate Reduction | Small Business Banking    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   3,436,000
Interest Rate Reduction | Specialty Lending    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   0
Interest Rate Reduction | Energy & Infrastructure    
Financing Receivable Modifications [Line Items]    
Amortized cost basis of loans modified during period   $ 0