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Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 8,671  
Due after one year through five years 274,984  
Due after five years through ten years 43,770  
Due after ten years 188,206  
Debt securities excluding securities not due at a single maturity date 515,631  
Total $ 1,677,016 $ 471,961
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 1.24%  
Due after one year through five years (as a percent) 0.89%  
Due after five years through ten years (as a percent) 2.43%  
Due after ten years (as a percent) 2.98%  
Debt securities (as a percent) 1.79%  
Total (as a percent) 1.38%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 8,707  
Due after one year through five years 274,537  
Due after five years through ten years 45,470  
Due after ten years 201,865  
Debt securities 530,579  
Debt Securities, Available-for-sale, Total 1,692,488 496,178
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Total 673,238 53,999
Securities Available-for-Sale, Fair Value    
Debt Securities, Available-for-sale, Total 672,967 56,585
Asset-backed Securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 236,293  
Total $ 236,293 130,959
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.12%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 236,877  
Debt Securities, Available-for-sale, Total 236,877 131,818
Collateralized loan obligations.    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 79,838  
Total $ 79,838 30,728
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.60%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 79,763  
Debt Securities, Available-for-sale, Total 79,763 $ 30,533
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 845,254  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.19%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 845,269