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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 212,486 | $ 238,023
Less Than 12 Months, Gross Unrealized Losses | (2,494) | (4,044)
12 Months or Longer, Fair Value | 2,044,152 | 2,089,545
12 Months or Longer, Gross Unrealized Losses | (288,818) | (281,739)
Total Fair Value | 2,256,638 | 2,327,568
Total Gross Unrealized Losses | (291,312) | (285,783)
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 | 11,302 | 7,171
Less Than 12 Months, Gross Unrealized Losses | (65) | (16)
12 Months or Longer, Fair Value | 154,379 | 155,341
12 Months or Longer, Gross Unrealized Losses | (11,601) | (11,080)
Total Fair Value | 165,681 | 162,512
Total Gross Unrealized Losses | (11,666) | (11,096)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 237
Less Than 12 Months, Gross Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 63,451 | 63,509
12 Months or Longer, Gross Unrealized Losses | (9,886) | (9,609)
Total Fair Value | 63,451 | 63,746
Total Gross Unrealized Losses | (9,886) | (9,611)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 1,425 | 1,476
12 Months or Longer, Gross Unrealized Losses | (81) | (80)
Total Fair Value | 1,425 | 1,476
Total Gross Unrealized Losses | (81) | (80)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 197,573 | 220,987
Less Than 12 Months, Gross Unrealized Losses | (2,427) | (4,013)
12 Months or Longer, Fair Value | 413,329 | 411,573
12 Months or Longer, Gross Unrealized Losses | (41,979) | (44,430)
Total Fair Value | 610,902 | 632,560
Total Gross Unrealized Losses | (44,406) | (48,443)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 3,611 | 9,628
Less Than 12 Months, Gross Unrealized Losses | (2) | (13)
12 Months or Longer, Fair Value | 594,450 | 613,926
12 Months or Longer, Gross Unrealized Losses | (89,406) | (84,772)
Total Fair Value | 598,061 | 623,554
Total Gross Unrealized Losses | (89,408) | (84,785)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 684,250 | 708,797
12 Months or Longer, Gross Unrealized Losses | (113,042) | (109,176)
Total Fair Value | 684,250 | 708,797
Total Gross Unrealized Losses | (113,042) | (109,176)
Commercial - Government Agencies or Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 132,868 | 134,923
12 Months or Longer, Gross Unrealized Losses | (22,823) | (22,592)
Total Fair Value | 132,868 | 134,923
Total Gross Unrealized Losses | (22,823) | (22,592)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 3,611 | 9,628
Less Than 12 Months, Gross Unrealized Losses | (2) | (13)
12 Months or Longer, Fair Value | 1,411,568 | 1,457,646
12 Months or Longer, Gross Unrealized Losses | (225,271) | (216,540)
Total Fair Value | 1,415,179 | 1,467,274
Total Gross Unrealized Losses | $ (225,273) | $ (216,553)

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