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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 | Dec. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 719 | 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,108,595 | $ 917,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (256,382) | $ (13,925)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 63 | 119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 477,373 | $ 91,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (89,665) | (2,331)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,585,968 | 1,009,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (346,047) | $ (16,256)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 127 | 50
Estimated Fair Value, Less Than 12 Months | $ 504,922 | $ 762,923
Unrealized Losses, Less Than 12 Months | $ (38,304) | $ (25,539)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 53 | 0
Estimated Fair Value, 12 Months or Longer | $ 620,127 | $ 0
Unrealized Losses, 12 Months or Longer | (157,903) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,125,049 | 762,923
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (196,207) | (25,539)
Amortized cost basis | 2,992,513 | 3,129,530
Gross Unrealized Gains | 301 | 74,116
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (346,047) | (16,256)
Estimated Fair Value | 2,646,767 | 3,187,390
HTM, at amortized cost | 1,321,256 | $ 980,384
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (196,207) |
Estimated Fair Value | $ 1,125,049 |
U.S. Government securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 1 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 96,906 | $ 127,618
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (2,814) | $ (213)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 121,579 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (4,841) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 218,485 | 127,618
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (7,655) | (213)
Held to Maturity |  |
Amortized cost basis | 226,140 | 127,831
Gross Unrealized Gains | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (7,655) | (213)
Estimated Fair Value | $ 218,485 | $ 127,618
US Government Agencies Debt Securities [Member] |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,008 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (42) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,008 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (42) |
Held to Maturity |  |
Amortized cost basis | 1,050 |
Gross Unrealized Gains | 0 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (42) |
Estimated Fair Value | $ 1,008 |
State and municipal securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 360 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 995,122 | $ 82,731
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (157,397) | $ (678)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 29 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 61,089 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (21,419) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,056,211 | 82,731
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (178,816) | $ (678)
Corporate debt securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 66 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 376,398 | $ 43,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (31,333) | $ (358)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 6 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 37,157 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (6,150) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 413,555 | 43,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (37,483) | (358)
Held to Maturity |  |
Amortized cost basis | 459,792 | 373,482
Gross Unrealized Gains | 0 | 13,009
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (37,483) | (358)
Estimated Fair Value | $ 422,309 | $ 386,133
Collateralized mortgage obligations |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 96 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 113,191 | $ 28,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (7,650) | $ (754)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 1 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 20,842 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (5,472) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 134,033 | 28,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (13,122) | (754)
Held to Maturity |  |
Amortized cost basis | 147,155 | 206,532
Gross Unrealized Gains | 0 | 3,581
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (13,122) | (754)
Estimated Fair Value | $ 134,033 | $ 209,359
Residential mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 81 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 154,861 | $ 123,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (18,301) | $ (2,388)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 5 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 55,293 | $ 16,669
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (11,546) | (648)
Debt Securities, Available-for-sale, Unrealized Loss Position | 210,154 | 140,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (29,847) | $ (3,036)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 106 | 14
Estimated Fair Value, Less Than 12 Months | $ 246,667 | $ 205,969
Unrealized Losses, Less Than 12 Months | $ (14,275) | $ (7,067)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 14 | 0
Estimated Fair Value, 12 Months or Longer | $ 153,178 | $ 0
Unrealized Losses, 12 Months or Longer | (43,205) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 399,845 | 205,969
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (57,480) | (7,067)
Amortized cost basis | 242,527 | 231,607
Gross Unrealized Gains | 18 | 1,224
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (29,847) | (3,036)
Estimated Fair Value | 212,698 | 229,795
HTM, at amortized cost | 457,325 | 404,958
Gross Unrealized Gains | 0 | 11,022
Gross Unrealized Losses | (57,480) | (7,067)
Estimated Fair Value | $ 399,845 | $ 408,913
Commercial mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 114 | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 371,109 | $ 512,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (38,845) | $ (9,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 20 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 181,413 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (40,237) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 552,522 | 512,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (79,082) | $ (9,534)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 21 | 36
Estimated Fair Value, Less Than 12 Months | $ 258,255 | $ 556,954
Unrealized Losses, Less Than 12 Months | $ (24,029) | $ (18,472)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 39 | 0
Estimated Fair Value, 12 Months or Longer | $ 466,949 | $ 0
Unrealized Losses, 12 Months or Longer | (114,698) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 725,204 | 556,954
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (138,727) | (18,472)
Amortized cost basis | 631,604 | 974,541
Gross Unrealized Gains | 0 | 6,141
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (79,082) | (9,534)
Estimated Fair Value | 552,522 | 971,148
HTM, at amortized cost | 863,931 | 575,426
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (138,727) | (18,472)
Estimated Fair Value | $ 725,204 | $ 556,954
Auction rate securities |  |
Available for Sale |  |
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 |  | 118
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | $ 74,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | (1,683)
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 74,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | (1,683)
Held to Maturity |  |
Amortized cost basis |  | 76,350
Gross Unrealized Gains |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (1,683)
Estimated Fair Value |  | $ 74,667

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- Definition Amount of accumulated unrealized loss on 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
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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 unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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