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Deposits (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
Deposits [Abstract] |
Schedule of deposits by category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | June 30, 2024 |  | December 31, 2023
U.S.: | ​ | ​ | ​ | ​ | ​ | ​
Interest-bearing | ​ | $ | 12,272,557 | ​ | $ | 12,731,915
Noninterest-bearing | ​ | ​ | 6,040,637 | ​ | ​ | 6,609,483
Foreign: | ​ | ​ | ​ | ​ | ​ | ​
Interest-bearing | ​ | ​ | 1,188,808 | ​ | ​ | 1,017,180
Noninterest-bearing | ​ | ​ | 816,830 | ​ | ​ | 974,079
Total deposits | ​ | $ | 20,318,832 | ​ | $ | 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 June 30, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Under | ​ | $250,000 | ​ | ​ | ​
(dollars in thousands) |  | $250,000 |  | or More |  | Total
Three months or less | ​ | $ | 731,969 | ​ | $ | 648,317 | ​ | $ | 1,380,286
Over three through six months | ​ | ​ | 665,280 | ​ | ​ | 447,274 | ​ | ​ | 1,112,554
Over six through twelve months | ​ | ​ | 389,986 | ​ | ​ | 282,001 | ​ | ​ | 671,987
One to two years | ​ | ​ | 48,512 | ​ | ​ | 7,231 | ​ | ​ | 55,743
Two to three years | ​ | ​ | 24,956 | ​ | ​ | 4,047 | ​ | ​ | 29,003
Three to four years | ​ | ​ | 19,732 | ​ | ​ | 5,989 | ​ | ​ | 25,721
Four to five years | ​ | ​ | 16,859 | ​ | ​ | 1,409 | ​ | ​ | 18,268
Thereafter | ​ | ​ | 809 | ​ | ​ | 334 | ​ | ​ | 1,143
Total | ​ | $ | 1,898,103 | ​ | $ | 1,396,602 | ​ | $ | 3,294,705

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