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Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 8,816  
Due after one year through five years 303,411  
Due after five years through ten years 44,313  
Due after ten years 182,249  
Debt securities excluding securities not due at a single maturity date 538,789  
Total $ 1,740,730 $ 1,678,160
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 1.10%  
Due after one year through five years (as a percent) 1.05%  
Due after five years through ten years (as a percent) 2.63%  
Due after ten years (as a percent) 3.02%  
Debt securities (as a percent) 1.85%  
Total (as a percent) 2.51%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 8,617  
Due after one year through five years 284,480  
Due after five years through ten years 39,593  
Due after ten years 168,173  
Debt securities 500,863  
Debt Securities, Available-for-sale, Total 1,609,759 1,693,632
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 648,044 673,238
Securities Available-for-Sale, Fair Value    
Debt Securities, Available-for-sale, Total 587,846 672,967
Asset-backed Securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 227,130  
Total $ 227,130 236,293
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.39%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 219,587  
Debt Securities, Available-for-sale, Total 219,587 236,877
Collateralized loan obligations.    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 180,910  
Total $ 180,910 79,838
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 4.64%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 173,837  
Debt Securities, Available-for-sale, Total 173,837 $ 79,763
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 793,901  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.22%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 715,472