Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 452,770	$ 309,470
Less Than 12 Months, Gross Unrealized Losses	(716)	(676)
12 Months or Longer, Fair Value	2,012,400	2,050,731
12 Months or Longer, Gross Unrealized Losses	(225,807)	(258,459)
Total Fair Value	2,465,170	2,360,201
Total Gross Unrealized Losses	(226,523)	(259,135)
Debt Securities Issued by the U.S. Treasury and Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	34,196	38,854
Less Than 12 Months, Gross Unrealized Losses	(51)	(288)
12 Months or Longer, Fair Value	140,229	157,456
12 Months or Longer, Gross Unrealized Losses	(6,217)	(7,897)
Total Fair Value	174,425	196,310
Total Gross Unrealized Losses	(6,268)	(8,185)
Debt Securities Issued by States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
12 Months or Longer, Fair Value	64,996	63,644
12 Months or Longer, Gross Unrealized Losses	(7,972)	(9,349)
Total Fair Value	64,996	63,644
Total Gross Unrealized Losses	(7,972)	(9,349)
Debt Securities Issued by Government-Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
12 Months or Longer, Fair Value	1,336	1,464
12 Months or Longer, Gross Unrealized Losses	(29)	(41)
Total Fair Value	1,336	1,464
Total Gross Unrealized Losses	(29)	(41)
Debt Securities Issued by Corporations
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	74,877	24,892
Less Than 12 Months, Gross Unrealized Losses	(123)	(108)
12 Months or Longer, Fair Value	549,445	546,407
12 Months or Longer, Gross Unrealized Losses	(28,406)	(32,172)
Total Fair Value	624,322	571,299
Total Gross Unrealized Losses	(28,529)	(32,280)
Residential - Government Agencies or Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	180,884	153,104
Less Than 12 Months, Gross Unrealized Losses	(276)	(275)
12 Months or Longer, Fair Value	655,542	673,141
12 Months or Longer, Gross Unrealized Losses	(102,219)	(115,126)
Total Fair Value	836,426	826,245
Total Gross Unrealized Losses	(102,495)	(115,401)
Commercial - Government Agencies or Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	109,378	92,485
Less Than 12 Months, Gross Unrealized Losses	(155)	(5)
12 Months or Longer, Fair Value	128,467	128,430
12 Months or Longer, Gross Unrealized Losses	(21,806)	(23,416)
Total Fair Value	237,845	220,915
Total Gross Unrealized Losses	(21,961)	(23,421)
Collateralized Mortgage Obligations
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	290,262	245,589
Less Than 12 Months, Gross Unrealized Losses	(431)	(280)
12 Months or Longer, Fair Value	784,009	801,571
12 Months or Longer, Gross Unrealized Losses	(124,025)	(138,542)
Total Fair Value	1,074,271	1,047,160
Total Gross Unrealized Losses	(124,456)	(138,822)
Residential - Government Agencies or Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	53,435	135
Less Than 12 Months, Gross Unrealized Losses	(111)
12 Months or Longer, Fair Value	472,385	480,189
12 Months or Longer, Gross Unrealized Losses	(59,158)	(70,458)
Total Fair Value	525,820	480,324
Total Gross Unrealized Losses	(59,269)	(70,458)
Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	53,435	135
Less Than 12 Months, Gross Unrealized Losses	(111)
12 Months or Longer, Fair Value	472,385	480,189
12 Months or Longer, Gross Unrealized Losses	(59,158)	(70,458)
Total Fair Value	525,820	480,324
Total Gross Unrealized Losses	$ (59,269)	$ (70,458)