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Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 7,451  
Due after one year through five years 300,065  
Due after five years through ten years 46,076  
Due after ten years 184,071  
Debt securities excluding securities not due at a single maturity date 537,663  
Total $ 1,865,807 $ 1,677,016
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 1.47%  
Due after one year through five years (as a percent) 0.95%  
Due after five years through ten years (as a percent) 2.50%  
Due after ten years (as a percent) 2.98%  
Debt securities (as a percent) 1.78%  
Total (as a percent) 1.61%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 7,458  
Due after one year through five years 289,731  
Due after five years through ten years 44,739  
Due after ten years 183,762  
Debt securities 525,690  
Debt Securities, Available-for-sale, Total 1,816,450 1,692,488
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 720,960 673,238
Securities Available-for-Sale, Fair Value    
Debt Securities, Available-for-sale, Total 696,513 672,967
Asset-backed Securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 278,941  
Total $ 278,941 236,293
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.33%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 274,941  
Debt Securities, Available-for-sale, Total 274,941 236,877
Collateralized loan obligations.    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 167,124  
Total $ 167,124 79,838
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.06%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 166,158  
Debt Securities, Available-for-sale, Total 166,158 $ 79,763
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 882,079  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.50%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 849,661