Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	$ 376,595	$ 1,032,863
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(37,023)	(22,142)
Estimated Fair Value, 12 Months or More	763,274	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(174,250)	0
Securities Continuous Unrealized Loss Position Fair Value	1,139,869	1,032,863
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(211,273)	(22,142)
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	21,234	11,213
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(1,979)	(206)
Estimated Fair Value, 12 Months or More	9,230	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(2,181)	0
Securities Continuous Unrealized Loss Position Fair Value	30,464	11,213
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(4,160)	(206)
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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)
Corporate Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	14,406	19,013
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(590)	(112)
Estimated Fair Value, 12 Months or More	12,632	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(2,395)	0
Securities Continuous Unrealized Loss Position Fair Value	27,038	19,013
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(2,985)	(112)
Foreign Government Debt
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months		997
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses		(3)
Estimated Fair Value, 12 Months or More		0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses		0
Securities Continuous Unrealized Loss Position Fair Value		997
SecuritiesContinuousUnrealizedLossPositionAggregateLosses		(3)
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	3,734
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(405)
Estimated Fair Value, 12 Months or More	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0
Securities Continuous Unrealized Loss Position Fair Value	3,734
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(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	239,760	658,965
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(21,543)	(14,779)
Estimated Fair Value, 12 Months or More	482,195	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(110,306)	0
Securities Continuous Unrealized Loss Position Fair Value	721,955	658,965
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(131,849)	(14,779)
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	92,208	320,414
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(12,364)	(6,398)
Estimated Fair Value, 12 Months or More	240,241	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(54,722)	0
Securities Continuous Unrealized Loss Position Fair Value	332,449	320,414
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(67,086)	(6,398)
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	4,666
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(129)
Estimated Fair Value, 12 Months or More	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0
Securities Continuous Unrealized Loss Position Fair Value	4,666
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(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	22,261
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	0	(644)
Estimated Fair Value, 12 Months or More	18,603	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(4,619)	0
Securities Continuous Unrealized Loss Position Fair Value	18,603	22,261
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	$ (4,619)	$ (644)