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Securities - Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due within one year $ 1,322  
Due after one year through five years 6,319  
Due after five years through ten years 126,189  
Due after ten years 208,648  
Amortized Cost 1,174,695 $ 1,221,496
Fair Value    
Due within one year 1,292  
Due after one year through five years 5,853  
Due after five years through ten years 110,897  
Due after ten years 178,424  
Fair Value 1,052,705 1,121,830
Amortized Cost    
Due within one year 1,001  
Due after one year through five years 36,378  
Due after five years through ten years 38,250  
Due after ten years 50,766  
Amortized Cost 894,599 1,062,649
Fair Value    
Due within one year 996  
Due after one year through five years 36,558  
Due after five years through ten years 34,491  
Due after ten years 49,727  
Fair Value 749,685 923,279
Residential mortgage backed securities:    
Amortized Cost    
Amortized Cost 371,232 387,208
Fair Value    
Fair Value 333,215 355,538
Other debt securities    
Amortized Cost    
Without single maturity date, amortized cost 0  
Amortized Cost 56,124 58,373
Fair Value    
Without single maturity date, fair value 0  
Fair Value 51,417 54,254
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 7,701  
Amortized Cost 113,741 72,383
Fair Value    
Debt securities, without fixed maturity, fair value 6,893  
Fair Value 110,515 68,034
Government agency mortgage backed securities | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 399,822  
Amortized Cost 399,822 426,264
Fair Value    
Without single maturity date, fair value 372,440  
Fair Value 372,440 405,950
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 193,895  
Amortized Cost 193,895 301,400
Fair Value    
Debt securities, without fixed maturity, fair value 167,617  
Fair Value 167,617 276,604
Government agency mortgage backed securities | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 16,972  
Amortized Cost 16,972 16,983
Fair Value    
Without single maturity date, fair value 13,914  
Fair Value 13,914 14,011
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 6,016  
Amortized Cost 6,016 6,029
Fair Value    
Debt securities, without fixed maturity, fair value 5,335  
Fair Value 5,335 5,392
Government agency collateralized mortgage obligations | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 371,232  
Fair Value    
Without single maturity date, fair value 333,215  
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 420,707  
Amortized Cost 420,707 485,164
Fair Value    
Debt securities, without fixed maturity, fair value 330,961  
Fair Value 330,961 399,281
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 44,191  
Amortized Cost 44,191 44,514
Fair Value    
Without single maturity date, fair value 36,670  
Fair Value 36,670 37,537
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 139,885  
Amortized Cost 139,885 161,299
Fair Value    
Debt securities, without fixed maturity, fair value 117,107  
Fair Value $ 117,107 $ 139,358