Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	17	56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 225,420	$ 146,416
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (805)	$ (3,240)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	604	671
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 1,860,821	$ 2,145,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(249,579)	(298,236)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,086,241	2,291,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (250,384)	$ (301,476)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	180	180
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 1,064,304	$ 1,072,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(167,678)	(195,715)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,064,304	1,072,207
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (167,678)	$ (195,715)
US Government Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		$ 42,161
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(314)
Debt Securities, Available-for-sale, Unrealized Loss Position		42,161
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ (314)
US Government Agencies Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		$ 1,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(28)
Debt Securities, Available-for-sale, Unrealized Loss Position		1,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ (28)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	7	40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 19,919	$ 76,155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (138)	$ (858)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	273	314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 790,484	$ 917,274
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(112,481)	(128,789)
Debt Securities, Available-for-sale, Unrealized Loss Position	810,403	993,429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (112,619)	$ (129,647)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 42,945
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (1,326)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	49	60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 271,021	$ 370,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(22,524)	(39,310)
Debt Securities, Available-for-sale, Unrealized Loss Position	271,021	413,468
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (22,524)	$ (40,636)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 39,917	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (181)	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	78	93
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 91,327	$ 111,434
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(8,537)	(11,390)
Debt Securities, Available-for-sale, Unrealized Loss Position	131,244	111,434
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (8,718)	$ (11,390)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	8	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 165,584	$ 409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (486)	$ (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	69	69
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 187,709	$ 195,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(21,941)	(26,482)
Debt Securities, Available-for-sale, Unrealized Loss Position	353,293	195,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (22,427)	$ (26,485)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	120	60
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 328,926	$ 355,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(44,387)	(51,805)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	328,926	355,270
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (44,387)	$ (51,805)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 26,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (1,053)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	135	133
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 520,280	$ 507,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(84,096)	(91,923)
Debt Securities, Available-for-sale, Unrealized Loss Position	520,280	534,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (84,096)	$ (92,976)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	60	120
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 735,378	$ 716,937
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(123,291)	(143,910)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	735,378	716,937
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (123,291)	$ (143,910)