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Securities - Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 7,705  
Due after five years through ten years 112,024  
Due after ten years 224,348  
Amortized Cost 1,199,143 $ 1,221,496
Fair Value    
Due within one year 0  
Due after one year through five years 7,249  
Due after five years through ten years 99,428  
Due after ten years 195,245  
Fair Value 1,085,085 1,121,830
Amortized Cost    
Due within one year 2,274  
Due after one year through five years 35,762  
Due after five years through ten years 38,877  
Due after ten years 52,283  
Amortized Cost 910,048 1,062,649
Fair Value    
Due within one year 2,231  
Due after one year through five years 36,003  
Due after five years through ten years 34,712  
Due after ten years 51,365  
Fair Value 764,486 923,279
Residential mortgage backed securities:    
Amortized Cost    
Amortized Cost 379,244 387,208
Fair Value    
Fair Value 342,273 355,538
Other debt securities    
Amortized Cost    
Without single maturity date, amortized cost 0  
Amortized Cost 56,822 58,373
Fair Value    
Without single maturity date, fair value 0  
Fair Value 52,166 54,254
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 7,708  
Amortized Cost 115,235 72,383
Fair Value    
Debt securities, without fixed maturity, fair value 6,839  
Fair Value 111,387 68,034
Government agency mortgage backed securities | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 414,485  
Amortized Cost 414,485 426,264
Fair Value    
Without single maturity date, fair value 390,020  
Fair Value 390,020 405,950
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 198,253  
Amortized Cost 198,253 301,400
Fair Value    
Debt securities, without fixed maturity, fair value 172,279  
Fair Value 172,279 276,604
Government agency mortgage backed securities | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 16,977  
Amortized Cost 16,977 16,983
Fair Value    
Without single maturity date, fair value 13,921  
Fair Value 13,921 14,011
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 6,023  
Amortized Cost 6,023 6,029
Fair Value    
Debt securities, without fixed maturity, fair value 5,344  
Fair Value 5,344 5,392
Government agency collateralized mortgage obligations | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 379,244  
Fair Value    
Without single maturity date, fair value 342,273  
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 431,344  
Amortized Cost 431,344 485,164
Fair Value    
Debt securities, without fixed maturity, fair value 340,891  
Fair Value 340,891 399,281
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 44,360  
Amortized Cost 44,360 44,514
Fair Value    
Without single maturity date, fair value 36,949  
Fair Value 36,949 37,537
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 137,524  
Amortized Cost 137,524 161,299
Fair Value    
Debt securities, without fixed maturity, fair value 114,822  
Fair Value $ 114,822 $ 139,358