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Securities - Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 3,294  
Due after five years through ten years 70,241  
Due after ten years 216,413  
Amortized Cost 1,273,076 $ 1,324,072
Fair Value    
Due within one year 0  
Due after one year through five years 3,115  
Due after five years through ten years 61,158  
Due after ten years 182,917  
Fair Value 1,153,541 1,206,540
Amortized Cost    
Due within one year 8,630  
Due after one year through five years 37,323  
Due after five years through ten years 51,728  
Due after ten years 16,769  
Amortized Cost 1,130,119 1,735,000
Fair Value    
Due within one year 8,599  
Due after one year through five years 37,428  
Due after five years through ten years 44,978  
Due after ten years 14,671  
Fair Value 950,930 1,533,942
Residential mortgage backed securities:    
Amortized Cost    
Amortized Cost 405,793 423,315
Fair Value    
Fair Value 370,421 392,609
Other debt securities    
Amortized Cost    
Without single maturity date, amortized cost 60,228  
Amortized Cost 60,227 62,875
Fair Value    
Without single maturity date, fair value 55,169  
Fair Value 55,169 58,609
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 73  
Amortized Cost 73,049 74,885
Fair Value    
Debt securities, without fixed maturity, fair value 71  
Fair Value 67,696 70,836
Government agency mortgage backed securities | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 455,199  
Amortized Cost 455,199 483,560
Fair Value    
Without single maturity date, fair value 429,402  
Fair Value 429,402 459,128
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 328,760  
Amortized Cost 328,760 508,415
Fair Value    
Debt securities, without fixed maturity, fair value 286,037  
Fair Value 286,037 456,416
Government agency mortgage backed securities | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 16,995  
Amortized Cost 16,995 17,006
Fair Value    
Without single maturity date, fair value 13,764  
Fair Value 13,764 13,745
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 6,042  
Amortized Cost 6,042 11,166
Fair Value    
Debt securities, without fixed maturity, fair value 5,245  
Fair Value 5,245 10,113
Government agency collateralized mortgage obligations | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 405,793  
Fair Value    
Without single maturity date, fair value 370,421  
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 516,474  
Amortized Cost 516,474 605,033
Fair Value    
Debt securities, without fixed maturity, fair value 415,089  
Fair Value 415,089 501,169
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 44,913  
Amortized Cost 44,913 45,430
Fair Value    
Without single maturity date, fair value 37,595  
Fair Value 37,595 38,871
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 164,320  
Amortized Cost 164,320 211,435
Fair Value    
Debt securities, without fixed maturity, fair value 138,812  
Fair Value $ 138,812 $ 185,846