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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Securities, FV-NI $ 28,578 $ 6,147    
Securities available-for-sale, at fair value 10,694,458 5,235,591    
Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 3,555 4,520    
Derivative Liability, Fair Value of Collateral 931 1,150    
Securities available-for-sale, at fair value 10,694,458      
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 28,578 6,147    
Securities available-for-sale, at fair value 966,898 5,302    
Level 2 | Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 931 1,150    
Equity Securities, FV-NI 0 0    
Securities available-for-sale, at fair value 9,712,559 5,199,917    
Level 3        
Warrants Not Settleable in Cash, Fair Value Disclosure   4,520 $ 3,434 $ 4,793
Level 3 | Fair Value, Recurring        
Warrants Not Settleable in Cash, Fair Value Disclosure 3,555 4,520    
Derivative Liability, Fair Value of Collateral 0 0    
Equity Securities, FV-NI 0 0    
Securities available-for-sale, at fair value 15,001 30,372    
Government agency and government-sponsored enterprise pass through securities [Member]        
Securities available-for-sale, at fair value 1,688,967 1,281,877    
Government agency and government-sponsored enterprise pass through securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 2,898,210 341,074    
Government agency and government-sponsored enterprise pass through securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Government agency and government-sponsored enterprise pass through securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 2,898,210 341,074    
Government agency and government-sponsored enterprise pass through securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Municipal Securities [Member]        
Securities available-for-sale, at fair value 2,315,968 1,531,617    
Municipal Securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 2,315,968 1,531,617    
Municipal Securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Municipal Securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 2,315,968 1,531,617    
Municipal Securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 1,688,967 1,281,877    
Commercial Mortgage Backed Securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Commercial Mortgage Backed Securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 1,688,967 1,281,877    
Commercial Mortgage Backed Securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]        
Securities available-for-sale, at fair value 1,038,134 1,219,880    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 1,038,134 1,219,880    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 1,038,134 1,219,880    
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
US Treasury Securities [Member]        
Securities available-for-sale, at fair value 966,898 5,302    
US Treasury Securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 966,898 5,302    
US Treasury Securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 966,898 5,302    
US Treasury Securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
US Treasury Securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Corporate Debt Securities [Member]        
Securities available-for-sale, at fair value 527,094 311,889    
Corporate Debt Securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 527,094 311,889    
Corporate Debt Securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Corporate Debt Securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 527,094 311,889    
Corporate Debt Securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Mortgage-backed Securities, Issued by Private Enterprises        
Securities available-for-sale, at fair value 450,217 82,957    
Mortgage-backed Securities, Issued by Private Enterprises | Fair Value, Recurring        
Securities available-for-sale, at fair value 450,217 82,957    
Mortgage-backed Securities, Issued by Private Enterprises | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Mortgage-backed Securities, Issued by Private Enterprises | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 435,216 57,232    
Mortgage-backed Securities, Issued by Private Enterprises | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 15,001 25,725    
Collateralized Loan Obligations [Member]        
Securities available-for-sale, at fair value 385,362 135,876    
Collateralized Loan Obligations [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 385,362 135,876    
Collateralized Loan Obligations [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Collateralized Loan Obligations [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 385,362 135,876    
Collateralized Loan Obligations [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Private Label Collateralized Mortgage Obligations [Member]        
Securities available-for-sale, at fair value 264,417 116,946    
Private Label Collateralized Mortgage Obligations [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 264,417 116,946    
Private Label Collateralized Mortgage Obligations [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Private Label Collateralized Mortgage Obligations [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 264,417 112,299    
Private Label Collateralized Mortgage Obligations [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 4,647    
Asset-backed Securities [Member]        
Securities available-for-sale, at fair value 129,547 166,546    
Asset-backed Securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 129,547 166,546    
Asset-backed Securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
Asset-backed Securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 129,547 166,546    
Asset-backed Securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
SBA asset-backed securities [Member]        
Securities available-for-sale, at fair value 29,644 41,627    
SBA asset-backed securities [Member] | Fair Value, Recurring        
Securities available-for-sale, at fair value 29,644 41,627    
SBA asset-backed securities [Member] | Level 1 | Fair Value, Recurring        
Securities available-for-sale, at fair value 0 0    
SBA asset-backed securities [Member] | Level 2 | Fair Value, Recurring        
Securities available-for-sale, at fair value 29,644 41,627    
SBA asset-backed securities [Member] | Level 3 | Fair Value, Recurring        
Securities available-for-sale, at fair value $ 0 $ 0