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Securities - Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 3,265  
Due after five years through ten years 75,045  
Due after ten years 210,743  
Amortized Cost 1,245,627 $ 1,324,072
Fair Value    
Due within one year 0  
Due after one year through five years 3,044  
Due after five years through ten years 62,072  
Due after ten years 166,277  
Fair Value 1,079,123 1,206,540
Amortized Cost    
Due within one year 6,482  
Due after one year through five years 36,332  
Due after five years through ten years 42,481  
Due after ten years 16,688  
Amortized Cost 1,105,472 1,735,000
Fair Value    
Due within one year 6,402  
Due after one year through five years 36,386  
Due after five years through ten years 36,784  
Due after ten years 13,887  
Fair Value 909,108 1,533,942
Residential mortgage backed securities:    
Amortized Cost    
Amortized Cost 395,441 423,315
Fair Value    
Fair Value 346,411 392,609
Other debt securities    
Amortized Cost    
Without single maturity date, amortized cost 59,192  
Amortized Cost 59,192 62,875
Fair Value    
Without single maturity date, fair value 52,763  
Fair Value 52,763 58,609
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 8,603  
Amortized Cost 72,386 74,885
Fair Value    
Debt securities, without fixed maturity, fair value 7,435  
Fair Value 67,355 70,836
Government agency mortgage backed securities | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 440,227  
Amortized Cost 440,227 483,560
Fair Value    
Without single maturity date, fair value 398,877  
Fair Value 398,877 459,128
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 321,245  
Amortized Cost 321,245 508,415
Fair Value    
Debt securities, without fixed maturity, fair value 271,448  
Fair Value 271,448 456,416
Government agency mortgage backed securities | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 16,989  
Amortized Cost 16,989 17,006
Fair Value    
Without single maturity date, fair value 13,189  
Fair Value 13,189 13,745
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 6,036  
Amortized Cost 6,036 11,166
Fair Value    
Debt securities, without fixed maturity, fair value 5,128  
Fair Value 5,128 10,113
Government agency collateralized mortgage obligations | Residential mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 395,441  
Fair Value    
Without single maturity date, fair value 346,411  
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 501,793  
Amortized Cost 501,793 605,033
Fair Value    
Debt securities, without fixed maturity, fair value 392,897  
Fair Value 392,897 501,169
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:    
Amortized Cost    
Without single maturity date, amortized cost 44,725  
Amortized Cost 44,725 45,430
Fair Value    
Without single maturity date, fair value 36,490  
Fair Value 36,490 38,871
Amortized Cost    
Debt securities, without fixed maturity, amortized cost 165,812  
Amortized Cost 165,812 211,435
Fair Value    
Debt securities, without fixed maturity, fair value 138,741  
Fair Value $ 138,741 $ 185,846