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Securities - Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 7,770  
Due after five years through ten years 104,491  
Due after ten years 234,266  
Amortized Cost 1,221,496 $ 1,324,072
Fair Value    
Due within one year 0  
Due after one year through five years 7,358  
Due after five years through ten years 94,154  
Due after ten years 207,282  
Fair Value 1,121,830 1,206,540
Amortized Cost    
Due within one year 5,710  
Due after one year through five years 36,353  
Due after five years through ten years 42,145  
Due after ten years 15,954  
Amortized Cost 1,062,649 1,735,000
Fair Value    
Due within one year 5,650  
Due after one year through five years 36,390  
Due after five years through ten years 37,993  
Due after ten years 14,893  
Fair Value 923,279 1,533,942
Residential mortgage-backed securities    
Amortized Cost    
Amortized Cost 387,208 423,315
Fair Value    
Fair Value 355,538 392,609
Other debt securities    
Amortized Cost    
Without single maturity date, amortized cost 0  
Amortized Cost 58,373 62,875
Fair Value    
Without single maturity date, fair value 0  
Fair Value 54,254 58,609
Amortized Cost    
Without single maturity date, amortized cost 8,595  
Amortized Cost 72,383 74,885
Fair Value    
Without single maturity date, fair value 7,718  
Fair Value 68,034 70,836
Government agency mortgage-backed securities | Residential mortgage-backed securities    
Amortized Cost    
Without single maturity date, amortized cost 426,264  
Amortized Cost 426,264 483,560
Fair Value    
Without single maturity date, fair value 405,950  
Fair Value 405,950 459,128
Amortized Cost    
Without single maturity date, amortized cost 301,400  
Amortized Cost 301,400 508,415
Fair Value    
Without single maturity date, fair value 276,604  
Fair Value 276,604 456,416
Government agency mortgage-backed securities | Commercial mortgage-backed securities    
Amortized Cost    
Without single maturity date, amortized cost 16,983  
Amortized Cost 16,983 17,006
Fair Value    
Without single maturity date, fair value 14,011  
Fair Value 14,011 13,745
Amortized Cost    
Without single maturity date, amortized cost 6,029  
Amortized Cost 6,029 11,166
Fair Value    
Without single maturity date, fair value 5,392  
Fair Value 5,392 10,113
Government agency collateralized mortgage obligations | Residential mortgage-backed securities    
Amortized Cost    
Without single maturity date, amortized cost 387,208  
Fair Value    
Without single maturity date, fair value 355,538  
Amortized Cost    
Without single maturity date, amortized cost 485,164  
Amortized Cost 485,164 605,033
Fair Value    
Without single maturity date, fair value 399,281  
Fair Value 399,281 501,169
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities    
Amortized Cost    
Without single maturity date, amortized cost 44,514  
Amortized Cost 44,514 45,430
Fair Value    
Without single maturity date, fair value 37,537  
Fair Value 37,537 38,871
Amortized Cost    
Without single maturity date, amortized cost 161,299  
Amortized Cost 161,299 211,435
Fair Value    
Without single maturity date, fair value 139,358  
Fair Value $ 139,358 $ 185,846