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Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 1,019,731 $ 310,124
Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 982,573 285,333
Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 37,158 24,791
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 998,934 310,124
Level 3 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 961,776 285,333
Level 3 | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 37,158 $ 24,791
Level 3 | Valuation, Market Approach | Measurement Input Selling Cost    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net   0.08
Real estate owned, net   0.08
Level 3 | Valuation, Market Approach | Measurement Input Selling Cost | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.08  
Real estate owned, net 0.08  
Level 3 | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.101  
Mortgage servicing rights, at fair value 0.08  
Level 3 | Discounted Cash Flow | Recovery Lag | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.17  
Level 3 | Minimum | Discounted Cash Flow | Discount rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.0835
Mortgage servicing rights, at fair value   0.08
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, Prepayment Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.01
Mortgage servicing rights, at fair value   0.056
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.007  
Mortgage servicing rights, at fair value 0.058  
Level 3 | Minimum | Discounted Cash Flow | Default Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.0012
Level 3 | Minimum | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0  
Level 3 | Minimum | Discounted Cash Flow | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0
Level 3 | Minimum | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0  
Level 3 | Maximum | Discounted Cash Flow | Discount rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.0935
Mortgage servicing rights, at fair value   0.12
Level 3 | Maximum | Discounted Cash Flow | Measurement Input, Prepayment Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.30
Mortgage servicing rights, at fair value   0.168
Level 3 | Maximum | Discounted Cash Flow | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.30  
Mortgage servicing rights, at fair value 0.125  
Level 3 | Maximum | Discounted Cash Flow | Default Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.0699
Level 3 | Maximum | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.017  
Level 3 | Maximum | Discounted Cash Flow | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.1845
Level 3 | Maximum | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.15  
Level 3 | Weighted Average | Valuation, Market Approach | Measurement Input Selling Cost    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net   0.08
Real estate owned, net   0.08
Level 3 | Weighted Average | Valuation, Market Approach | Measurement Input Selling Cost | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.08  
Real estate owned, net 0.08  
Level 3 | Weighted Average | Discounted Cash Flow | Discount rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.089
Mortgage servicing rights, at fair value   0.081
Level 3 | Weighted Average | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.101  
Mortgage servicing rights, at fair value 0.08  
Level 3 | Weighted Average | Discounted Cash Flow | Measurement Input, Prepayment Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.151
Mortgage servicing rights, at fair value   0.063
Level 3 | Weighted Average | Discounted Cash Flow | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.19  
Mortgage servicing rights, at fair value 0.064  
Level 3 | Weighted Average | Discounted Cash Flow | Default Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.006
Level 3 | Weighted Average | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.004  
Level 3 | Weighted Average | Discounted Cash Flow | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.035
Level 3 | Weighted Average | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.033  
Level 3 | Weighted Average | Discounted Cash Flow | Recovery Lag | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.17  
Level 3 | Real Estate Owned Member    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements   $ 13,325
Level 3 | Real Estate Owned Member | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 29,299  
Level 3 | Individually evaluated loans requiring allowance net    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements   11,466
Level 3 | Individually evaluated loans requiring allowance net | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 7,859  
Level 3 | Loans Held for Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements   276,095
Level 3 | Loans Held for Investment | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 951,990  
Level 3 | Mortgage Servicing Rights    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements   $ 9,238
Level 3 | Mortgage Servicing Rights | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 9,786