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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 83,812 | $ 238,023
Less Than 12 Months, Gross Unrealized Losses | (67) | (4,044)
12 Months or Longer, Fair Value | 2,183,212 | 2,089,545
12 Months or Longer, Gross Unrealized Losses | (219,619) | (281,739)
Total Fair Value | 2,267,024 | 2,327,568
Total Gross Unrealized Losses | (219,686) | (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 | 32,603 | 7,171
Less Than 12 Months, Gross Unrealized Losses | (66) | (16)
12 Months or Longer, Fair Value | 157,416 | 155,341
12 Months or Longer, Gross Unrealized Losses | (7,156) | (11,080)
Total Fair Value | 190,019 | 162,512
Total Gross Unrealized Losses | (7,222) | (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 | 65,810 | 63,509
12 Months or Longer, Gross Unrealized Losses | (7,297) | (9,609)
Total Fair Value | 65,810 | 63,746
Total Gross Unrealized Losses | (7,297) | (9,611)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 1,464 | 1,476
12 Months or Longer, Gross Unrealized Losses | (42) | (80)
Total Fair Value | 1,464 | 1,476
Total Gross Unrealized Losses | (42) | (80)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 220,987
Less Than 12 Months, Gross Unrealized Losses |  | (4,013)
12 Months or Longer, Fair Value | 598,286 | 411,573
12 Months or Longer, Gross Unrealized Losses | (30,623) | (44,430)
Total Fair Value | 598,286 | 632,560
Total Gross Unrealized Losses | (30,623) | (48,443)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 2,211 | 9,628
Less Than 12 Months, Gross Unrealized Losses | (1) | (13)
12 Months or Longer, Fair Value | 565,187 | 613,926
12 Months or Longer, Gross Unrealized Losses | (68,652) | (84,772)
Total Fair Value | 567,398 | 623,554
Total Gross Unrealized Losses | (68,653) | (84,785)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 662,402 | 708,797
12 Months or Longer, Gross Unrealized Losses | (85,799) | (109,176)
Total Fair Value | 662,402 | 708,797
Total Gross Unrealized Losses | (85,799) | (109,176)
Commercial - Government Agencies or Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 48,998 |
12 Months or Longer, Fair Value | 132,647 | 134,923
12 Months or Longer, Gross Unrealized Losses | (20,050) | (22,592)
Total Fair Value | 181,645 | 134,923
Total Gross Unrealized Losses | (20,050) | (22,592)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 51,209 | 9,628
Less Than 12 Months, Gross Unrealized Losses | (1) | (13)
12 Months or Longer, Fair Value | 1,360,236 | 1,457,646
12 Months or Longer, Gross Unrealized Losses | (174,501) | (216,540)
Total Fair Value | 1,411,445 | 1,467,274
Total Gross Unrealized Losses | $ (174,502) | $ (216,553)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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