Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	$ 102,611	$ 274,518
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(607)	(4,693)
Estimated Fair Value, 12 Months or More	783,123	840,467
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(136,960)	(189,855)
Securities Continuous Unrealized Loss Position Fair Value	885,734	1,114,985
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(137,567)	(194,548)
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	0	1,104
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	0	(11)
Estimated Fair Value, 12 Months or More	26,563	28,097
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(1,840)	(3,218)
Securities Continuous Unrealized Loss Position Fair Value	26,563	29,201
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(1,840)	(3,229)
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	0
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	0
Estimated Fair Value, 12 Months or More	596
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(4)
Securities Continuous Unrealized Loss Position Fair Value	596
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(4)
Corporate Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months	5,492	9,701
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(3)	(506)
Estimated Fair Value, 12 Months or More	22,845	17,321
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(1,217)	(1,930)
Securities Continuous Unrealized Loss Position Fair Value	28,337	27,022
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(1,220)	(2,436)
Foreign Government Debt
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated Fair Value, Less Than 12 Months		0
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses		0
Estimated Fair Value, 12 Months or More		584
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses		(16)
Securities Continuous Unrealized Loss Position Fair Value		584
SecuritiesContinuousUnrealizedLossPositionAggregateLosses		(16)
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	242
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	0	(1)
Estimated Fair Value, 12 Months or More	2,789	3,002
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(309)	(431)
Securities Continuous Unrealized Loss Position Fair Value	2,789	3,244
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(309)	(432)
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	19,924	4,759
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(95)	(56)
Estimated Fair Value, 12 Months or More	438,740	497,445
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(75,357)	(111,839)
Securities Continuous Unrealized Loss Position Fair Value	458,664	502,204
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(75,452)	(111,895)
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	77,195	258,712
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses	(509)	(4,119)
Estimated Fair Value, 12 Months or More	270,142	274,358
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(55,482)	(68,212)
Securities Continuous Unrealized Loss Position Fair Value	347,337	533,070
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	(55,991)	(72,331)
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	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	0	0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0	0
Securities Continuous Unrealized Loss Position Fair Value	0	0
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	0	0
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	21,448	19,660
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	(2,751)	(4,209)
Securities Continuous Unrealized Loss Position Fair Value	21,448	19,660
SecuritiesContinuousUnrealizedLossPositionAggregateLosses	$ (2,751)	$ (4,209)