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Deposits (Tables) | 9 Months Ended
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Sep. 30, 2024
Deposits [Abstract] |
Schedule of deposits by category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | September 30, 2024 |  | December 31, 2023
U.S.: | ​ | ​ | ​ | ​ | ​ | ​
Interest-bearing | ​ | $ | 12,145,741 | ​ | $ | 12,731,915
Noninterest-bearing | ​ | ​ | 6,006,013 | ​ | ​ | 6,609,483
Foreign: | ​ | ​ | ​ | ​ | ​ | ​
Interest-bearing | ​ | ​ | 1,281,933 | ​ | ​ | 1,017,180
Noninterest-bearing | ​ | ​ | 794,015 | ​ | ​ | 974,079
Total deposits | ​ | $ | 20,227,702 | ​ | $ | 21,332,657
Schedule of maturity distribution of time certificates of deposit | The following table presents the maturity distribution of time certificates of deposit as of September 30, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Under | ​ | $250,000 | ​ | ​ | ​
(dollars in thousands) |  | $250,000 |  | or More |  | Total
Three months or less | ​ | $ | 682,384 | ​ | $ | 633,301 | ​ | $ | 1,315,685
Over three through six months | ​ | ​ | 811,006 | ​ | ​ | 612,958 | ​ | ​ | 1,423,964
Over six through twelve months | ​ | ​ | 370,820 | ​ | ​ | 176,073 | ​ | ​ | 546,893
One to two years | ​ | ​ | 38,255 | ​ | ​ | 6,564 | ​ | ​ | 44,819
Two to three years | ​ | ​ | 21,456 | ​ | ​ | 6,579 | ​ | ​ | 28,035
Three to four years | ​ | ​ | 16,878 | ​ | ​ | 3,151 | ​ | ​ | 20,029
Four to five years | ​ | ​ | 15,645 | ​ | ​ | 6,653 | ​ | ​ | 22,298
Thereafter | ​ | ​ | 207 | ​ | ​ | 334 | ​ | ​ | 541
Total | ​ | $ | 1,956,651 | ​ | $ | 1,445,613 | ​ | $ | 3,402,264

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