Investment Securities - Gross Unrealized Losses of Aggregated by Investment Category and Length of Time that Individual Investment Securities have been in Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Fair Value, Less than 12 months	$ 170	$ 52,554
Available for sale securities, Unrealized Losses, Less than 12 months	(5)	(5,375)
Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer, Total	135,984	99,557
Available for sale securities, Unrealized Losses, 12 months or longer	(31,646)	(23,243)
Available for sale securities, Fair Value	136,154	152,111
Available for sale securities, Unrealized Losses	(31,651)	(28,618)
Held to maturity securities, Fair Value, Less than 12 months	35,650	286,872
Held to maturity securities, Unrealized Losses, Less than 12 months	(1,463)	(26,774)
Held to maturity securities, Fair Value, 12 months or longer	748,516	576,549
Held to maturity securities, Unrealized Losses, 12 months or longer	(194,494)	(139,729)
Held to maturity securities, Fair Value	784,166	863,421
Held to maturity securities, Unrealized Losses	(195,957)	(166,503)
Fair Value, Less than 12 months	35,820	339,426
Unrealized Losses, Less than 12 months	(1,468)	(32,149)
Fair Value, 12 months or longer	884,500	676,106
Unrealized Losses, 12 months or longer	(226,140)	(162,972)
Fair Value	920,320	1,015,532
Unrealized Losses	(227,608)	(195,121)
U.S. Government Sponsored Enterprise Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Fair Value, Less than 12 months		10,722
Available for sale securities, Unrealized Losses, Less than 12 months		(2,278)
Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer, Total	19,486	9,012
Available for sale securities, Unrealized Losses, 12 months or longer	(3,512)	(986)
Available for sale securities, Fair Value	19,486	19,734
Available for sale securities, Unrealized Losses	(3,512)	(3,264)
U.S. Treasury Notes
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Held to maturity securities, Fair Value, Less than 12 months	3,980	3,952
Held to maturity securities, Unrealized Losses, Less than 12 months	(43)	(18)
Held to maturity securities, Fair Value	3,980	3,952
Held to maturity securities, Unrealized Losses	(43)	(18)
Mortgage Backed Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Fair Value, Less than 12 months	170	41,832
Available for sale securities, Unrealized Losses, Less than 12 months	(5)	(3,097)
Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer, Total	116,498	90,545
Available for sale securities, Unrealized Losses, 12 months or longer	(28,134)	(22,257)
Available for sale securities, Fair Value	116,668	132,377
Available for sale securities, Unrealized Losses	(28,139)	(25,354)
Held to maturity securities, Fair Value, Less than 12 months		230,708
Held to maturity securities, Unrealized Losses, Less than 12 months		(22,362)
Held to maturity securities, Fair Value, 12 months or longer	706,702	562,835
Held to maturity securities, Unrealized Losses, 12 months or longer	(182,990)	(134,846)
Held to maturity securities, Fair Value	706,702	793,543
Held to maturity securities, Unrealized Losses	(182,990)	(157,208)
Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Held to maturity securities, Fair Value, Less than 12 months		243
Held to maturity securities, Unrealized Losses, Less than 12 months		(6)
Held to maturity securities, Fair Value, 12 months or longer	246
Held to maturity securities, Unrealized Losses, 12 months or longer	(4)
Held to maturity securities, Fair Value	246	243
Held to maturity securities, Unrealized Losses	(4)	(6)
Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Held to maturity securities, Fair Value, Less than 12 months	31,670	51,969
Held to maturity securities, Unrealized Losses, Less than 12 months	(1,420)	(4,388)
Held to maturity securities, Fair Value, 12 months or longer	41,568	13,714
Held to maturity securities, Unrealized Losses, 12 months or longer	(11,500)	(4,883)
Held to maturity securities, Fair Value	73,238	65,683
Held to maturity securities, Unrealized Losses	$ (12,920)	$ (9,271)