Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	$ 1,032,863	$ 3,755
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(22,142)	(10)
Estimated Fair Value, 12 Months or More	0	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0	0
Securities Continuous Unrealized Loss Position Fair Value	1,032,863	3,755
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(22,142)	(10)
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	11,213
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(206)
Estimated Fair Value, 12 Months or More	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0
Securities Continuous Unrealized Loss Position Fair Value	11,213
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(206)
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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)
Corporate Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	19,013
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(112)
Estimated Fair Value, 12 Months or More	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0
Securities Continuous Unrealized Loss Position Fair Value	19,013
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(112)
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	658,965	3,755
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(14,779)	(10)
Estimated Fair Value, 12 Months or More	0	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0	0
Securities Continuous Unrealized Loss Position Fair Value	658,965	3,755
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(14,779)	$ (10)
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	320,414
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(6,398)
Estimated Fair Value, 12 Months or More	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0
Securities Continuous Unrealized Loss Position Fair Value	320,414
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	$ (6,398)