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Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months $ 15,380 $ 376,595
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (111) (37,023)
Estimated Fair Value, 12 Months or More 1,018,290 763,274
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (193,924) (174,250)
Securities Continuous Unrealized Loss Position Fair Value 1,033,670 1,139,869
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (194,035) (211,273)
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 2,641 21,234
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (62) (1,979)
Estimated Fair Value, 12 Months or More 26,887 9,230
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (3,377) (2,181)
Securities Continuous Unrealized Loss Position Fair Value 29,528 30,464
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (3,439) (4,160)
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 199  
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (1)  
Estimated Fair Value, 12 Months or More 765  
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (35)  
Securities Continuous Unrealized Loss Position Fair Value 964  
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (36)  
Corporate Securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 11,416 14,406
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (45) (590)
Estimated Fair Value, 12 Months or More 21,426 12,632
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (3,574) (2,395)
Securities Continuous Unrealized Loss Position Fair Value 32,842 27,038
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (3,619) (2,985)
Foreign Government Debt    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months   587
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses   (13)
Estimated Fair Value, 12 Months or More   373
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses   (27)
Securities Continuous Unrealized Loss Position Fair Value   960
SecuritiesContinuousUnrealizedLossPositionAggregateLosses   (40)
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 3,734
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses 0 (405)
Estimated Fair Value, 12 Months or More 3,395 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (322) 0
Securities Continuous Unrealized Loss Position Fair Value 3,395 3,734
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (322) (405)
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 1,124 239,760
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (3) (21,543)
Estimated Fair Value, 12 Months or More 643,735 482,195
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (115,367) (110,306)
Securities Continuous Unrealized Loss Position Fair Value 644,859 721,955
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (115,370) (131,849)
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 92,208
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses 0 (12,364)
Estimated Fair Value, 12 Months or More 300,642 240,241
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (66,956) (54,722)
Securities Continuous Unrealized Loss Position Fair Value 300,642 332,449
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (66,956) (67,086)
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 4,666
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses 0 (129)
Estimated Fair Value, 12 Months or More 2,160 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (30) 0
Securities Continuous Unrealized Loss Position Fair Value 2,160 4,666
SecuritiesContinuousUnrealizedLossPositionAggregateLosses (30) (129)
Other Government - Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 0
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses 0 0
Estimated Fair Value, 12 Months or More 19,280 18,603
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (4,263) (4,619)
Securities Continuous Unrealized Loss Position Fair Value 19,280 18,603
SecuritiesContinuousUnrealizedLossPositionAggregateLosses $ (4,263) $ (4,619)