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Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 4,227  
Due after one year through five years 36,288  
Due after five years through ten years 28,159  
Due after ten years 197,091  
Debt securities excluding securities not due at a single maturity date 265,765  
Total $ 695,700 $ 471,961
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 1.87%  
Due after one year through five years (as a percent) 0.79%  
Due after five years through ten years (as a percent) 2.35%  
Due after ten years (as a percent) 3.01%  
Debt securities (as a percent) 2.62%  
Total (as a percent) 1.88%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 4,281  
Due after one year through five years 36,240  
Due after five years through ten years 29,387  
Due after ten years 211,681  
Debt securities 281,589  
Debt Securities, Available-for-sale, Total 715,188 496,178
Collateralized Mortgage Obligations [Member]    
Securities Available-for-Sale, Amortized Cost    
Total 163,756 53,999
Securities Available-for-Sale, Fair Value    
Debt Securities, Available-for-sale, Total 165,414 56,585
Asset-backed Securities [Member]    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 187,825  
Total $ 187,825 130,959
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.14%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 189,338  
Debt Securities, Available-for-sale, Total 189,338 131,818
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 61,085  
Total $ 61,085 30,728
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.40%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 61,029  
Debt Securities, Available-for-sale, Total 61,029 $ 30,533
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 181,025  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.73%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 183,232