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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity Securities, FV-NI $ 1 $ 28,578    
Securities available-for-sale, at fair value 4,843,487 10,694,458    
Other Borrowings, Fair Value Disclosure 132,030 0    
Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 487,606 1,688,967    
Municipal Securities [Member]        
Securities available-for-sale, at fair value 339,326 2,315,968    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 457,063 1,038,134    
US Treasury Securities [Member]        
Securities available-for-sale, at fair value 670,070 966,898    
Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 311,905 527,094    
Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 26,827 450,217    
Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 102,261 385,362    
Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 166,724 264,417    
Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 22,413 129,547    
SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value 17,250 29,644    
Credit-Link Notes        
Other Borrowings, Fair Value Disclosure 132,030 0    
Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 4,048 3,555    
Derivative Liability, Fair Value of Collateral 5,906 931    
Securities available-for-sale, at fair value 4,843,487      
Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 2,242,042 2,898,210    
Fair Value, Recurring | Municipal Securities [Member]        
Securities available-for-sale, at fair value 339,326 2,315,968    
Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]        
Securities available-for-sale, at fair value 487,606 1,688,967    
Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 457,063 1,038,134    
Fair Value, Recurring | US Treasury Securities [Member]        
Securities available-for-sale, at fair value 670,070 966,898    
Fair Value, Recurring | Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 311,905 527,094    
Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 26,827 450,217    
Fair Value, Recurring | Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 102,261 385,362    
Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 166,724 264,417    
Fair Value, Recurring | Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 22,413 129,547    
Fair Value, Recurring | SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value 17,250 29,644    
Level 1 | Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 0 0    
Equity Securities, FV-NI 1 28,578    
Securities available-for-sale, at fair value 670,070 966,898    
Other Borrowings 0      
Level 1 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Municipal Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | US Treasury Securities [Member]        
Securities available-for-sale, at fair value 670,070 966,898    
Level 1 | Fair Value, Recurring | Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 1 | Fair Value, Recurring | SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 2 | Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 5,906 931    
Equity Securities, FV-NI 0 0    
Securities available-for-sale, at fair value 4,173,417 9,712,559    
Other Borrowings 0      
Level 2 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 2,242,042 2,898,210    
Level 2 | Fair Value, Recurring | Municipal Securities [Member]        
Securities available-for-sale, at fair value 339,326 2,315,968    
Level 2 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]        
Securities available-for-sale, at fair value 487,606 1,688,967    
Level 2 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 457,063 1,038,134    
Level 2 | Fair Value, Recurring | US Treasury Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 2 | Fair Value, Recurring | Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 311,905 527,094    
Level 2 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 26,827 435,216    
Level 2 | Fair Value, Recurring | Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 102,261 385,362    
Level 2 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 166,724 264,417    
Level 2 | Fair Value, Recurring | Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 22,413 129,547    
Level 2 | Fair Value, Recurring | SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value 17,250 29,644    
Level 3        
Warrants Not Settleable in Cash, Fair Value Disclosure   3,555 $ 4,520 $ 3,434
Level 3 | Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 4,048 3,555    
Derivative Liability, Fair Value of Collateral 0 0    
Equity Securities, FV-NI 0 0    
Securities available-for-sale, at fair value 0 15,001    
Other Borrowings 132,030      
Level 3 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Municipal Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | US Treasury Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 0 15,001    
Level 3 | Fair Value, Recurring | Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 0 0    
Level 3 | Fair Value, Recurring | SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value $ 0 $ 0