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v3.22.2.2

Investment Securities - Gross unrealized losses and fair value (Details) $ in Thousands | Sep. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 262 | 239
Less than 12 months, estimated fair value | $ 1,182,005 | $ 1,891,310
Less than 12 months, unrealized losses | (140,542) | (24,285)
12 months or greater, estimated fair value | 458,292 | 177,038
12 months or greater, unrealized losses | (83,594) | (5,322)
Estimated fair value | 1,640,297 | 2,068,348
Unrealized losses | $ (224,136) | $ (29,607)
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 2 | 1
Less than 12 months, estimated fair value | $ 46,048 | $ 24,593
Less than 12 months, unrealized losses | (3,719) | (257)
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated fair value | 46,048 | 24,593
Unrealized losses | $ (3,719) | $ (257)
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 84 | 64
Less than 12 months, estimated fair value | $ 450,079 | $ 452,966
Less than 12 months, unrealized losses | (49,232) | (6,256)
12 months or greater, estimated fair value | 212,988 | 68,977
12 months or greater, unrealized losses | (33,452) | (1,366)
Estimated fair value | 663,067 | 521,943
Unrealized losses | $ (82,684) | $ (7,622)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 159 | 153
Less than 12 months, estimated fair value | $ 581,381 | $ 1,327,519
Less than 12 months, unrealized losses | (80,300) | (16,841)
12 months or greater, estimated fair value | 245,304 | 108,061
12 months or greater, unrealized losses | (50,142) | (3,956)
Estimated fair value | 826,685 | 1,435,580
Unrealized losses | $ (130,442) | $ (20,797)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 14 |
Less than 12 months, estimated fair value | $ 94,172 |
Less than 12 months, unrealized losses | (6,106) |
12 months or greater, estimated fair value | 0 |
12 months or greater, unrealized losses | 0 |
Estimated fair value | 94,172 |
Unrealized losses | $ (6,106) |
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 2 | 8
Less than 12 months, estimated fair value | $ 8,463 | $ 20,181
Less than 12 months, unrealized losses | (1,047) | (347)
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated fair value | 8,463 | 20,181
Unrealized losses | $ (1,047) | $ (347)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 1 | 13
Less than 12 months, estimated fair value | $ 1,862 | $ 66,051
Less than 12 months, unrealized losses | (138) | (584)
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated fair value | 1,862 | 66,051
Unrealized losses | $ (138) | $ (584)

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