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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 260 | 239
Less than 12 months, estimated fair value | $ 495,164 | $ 1,891,310
Less than 12 months, unrealized losses | (58,439) | (24,285)
12 months or greater, estimated fair value | 1,093,919 | 177,038
12 months or greater, unrealized losses | (146,839) | (5,322)
Estimated Fair Value | 1,589,083 | 2,068,348
Unrealized Losses | $ (205,278) | $ (29,607)
Number of Securities | security | 232 |
Less than 12 months, estimated fair value | $ 23,881 |
Less than 12 months, unrealized losses | 3,228 |
12 months or greater, estimated fair value | 932,753 |
12 months or greater, unrealized losses | 122,205 |
Estimated Fair Value | 956,634 |
Unrealized Losses | $ 125,433 |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Number of Securities | security | 232 |
Less than 12 months, estimated fair value | $ 23,881 |
Less than 12 months, unrealized losses | 3,228 |
12 months or greater, estimated fair value | 932,753 |
12 months or greater, unrealized losses | 122,205 |
Estimated Fair Value | 956,634 |
Unrealized Losses | $ 125,433 |
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 2 | 1
Less than 12 months, estimated fair value | $ 0 | $ 24,593
Less than 12 months, unrealized losses | 0 | (257)
12 months or greater, estimated fair value | 46,327 | 0
12 months or greater, unrealized losses | (3,466) | 0
Estimated Fair Value | 46,327 | 24,593
Unrealized Losses | $ (3,466) | $ (257)
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 85 | 64
Less than 12 months, estimated fair value | $ 490,699 | $ 452,966
Less than 12 months, unrealized losses | (58,437) | (6,256)
12 months or greater, estimated fair value | 179,029 | 68,977
12 months or greater, unrealized losses | (19,612) | (1,366)
Estimated Fair Value | 669,728 | 521,943
Unrealized Losses | $ (78,049) | $ (7,622)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 157 | 149
Less than 12 months, estimated fair value | $ 3,994 | $ 1,327,519
Less than 12 months, unrealized losses | 0 | (16,841)
12 months or greater, estimated fair value | 808,697 | 84,500
12 months or greater, unrealized losses | (117,073) | (3,606)
Estimated Fair Value | 812,691 | 1,412,019
Unrealized Losses | $ (117,073) | $ (20,447)
Number of Securities | security | 143 |
Less than 12 months, estimated fair value | $ 0 |
Less than 12 months, unrealized losses | 0 |
12 months or greater, estimated fair value | 652,667 |
12 months or greater, unrealized losses | 88,390 |
Estimated Fair Value | 652,667 |
Unrealized Losses | $ 88,390 |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Number of Securities | security | 143 |
Less than 12 months, estimated fair value | $ 0 |
Less than 12 months, unrealized losses | 0 |
12 months or greater, estimated fair value | 652,667 |
12 months or greater, unrealized losses | 88,390 |
Estimated Fair Value | 652,667 |
Unrealized Losses | $ 88,390 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 14 |
Less than 12 months, estimated fair value | $ 471 |
Less than 12 months, unrealized losses | (2) |
12 months or greater, estimated fair value | 49,742 |
12 months or greater, unrealized losses | (5,855) |
Estimated Fair Value | 50,213 |
Unrealized Losses | $ (5,857) |
Number of Securities | security | 16 | 4
Less than 12 months, estimated fair value | $ 0 | $ 0
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 80,564 | 23,561
12 months or greater, unrealized losses | 11,993 | 350
Estimated Fair Value | 80,564 | 23,561
Unrealized Losses | $ 11,993 | $ 350
Schedule of Held-to-Maturity Securities [Line Items] |  |
Number of Securities | security | 16 | 4
Less than 12 months, estimated fair value | $ 0 | $ 0
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 80,564 | 23,561
12 months or greater, unrealized losses | 11,993 | 350
Estimated Fair Value | 80,564 | 23,561
Unrealized Losses | $ 11,993 | $ 350
US states and political subdivisions debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 1 | 8
Less than 12 months, estimated fair value | $ 0 | $ 20,181
Less than 12 months, unrealized losses | 0 | (347)
12 months or greater, estimated fair value | 8,299 | 0
12 months or greater, unrealized losses | (658) | 0
Estimated Fair Value | 8,299 | 20,181
Unrealized Losses | $ (658) | $ (347)
Number of Securities | security | 43 |
Less than 12 months, estimated fair value | $ 3,110 |
Less than 12 months, unrealized losses | 45 |
12 months or greater, estimated fair value | 113,071 |
12 months or greater, unrealized losses | 12,047 |
Estimated Fair Value | 116,181 |
Unrealized Losses | $ 12,092 |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Number of Securities | security | 43 |
Less than 12 months, estimated fair value | $ 3,110 |
Less than 12 months, unrealized losses | 45 |
12 months or greater, estimated fair value | 113,071 |
12 months or greater, unrealized losses | 12,047 |
Estimated Fair Value | 116,181 |
Unrealized Losses | $ 12,092 |
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 1 | 13
Less than 12 months, estimated fair value | $ 0 | $ 66,051
Less than 12 months, unrealized losses | 0 | (584)
12 months or greater, estimated fair value | 1,825 | 0
12 months or greater, unrealized losses | (175) | 0
Estimated Fair Value | 1,825 | 66,051
Unrealized Losses | $ (175) | $ (584)
Number of Securities | security | 30 |
Less than 12 months, estimated fair value | $ 20,771 |
Less than 12 months, unrealized losses | 3,183 |
12 months or greater, estimated fair value | 86,451 |
12 months or greater, unrealized losses | 9,775 |
Estimated Fair Value | 107,222 |
Unrealized Losses | $ 12,958 |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Number of Securities | security | 30 |
Less than 12 months, estimated fair value | $ 20,771 |
Less than 12 months, unrealized losses | 3,183 |
12 months or greater, estimated fair value | 86,451 |
12 months or greater, unrealized losses | 9,775 |
Estimated Fair Value | 107,222 |
Unrealized Losses | $ 12,958 |

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