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Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 153,576  
Due after one year through five years 151,098  
Due after five years through ten years 52,232  
Due after ten years 174,788  
Debt securities excluding securities not due at a single maturity date 531,694  
Total $ 1,448,010 $ 1,662,819
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 0.93%  
Due after one year through five years (as a percent) 1.19%  
Due after five years through ten years (as a percent) 3.03%  
Due after ten years (as a percent) 3.07%  
Debt securities (as a percent) 1.91%  
Total (as a percent) 3.00%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 149,066  
Due after one year through five years 140,669  
Due after five years through ten years 48,401  
Due after ten years 166,874  
Debt securities 505,010  
Debt Securities, Available-for-sale, Total 1,335,622 1,539,359
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 598,002  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.29%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 522,635  
Asset-backed Securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 140,791  
Total $ 140,791 210,388
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 5.15%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 134,319  
Debt Securities, Available-for-sale, Total 134,319 201,928
Collateralized loan obligations.    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 177,523  
Total $ 177,523 180,276
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 6.92%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 173,658  
Debt Securities, Available-for-sale, Total $ 173,658 $ 174,746