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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Investment Securities |
Schedule of amortized cost and fair value of investment securities held to maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross |  | Gross | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
September 30, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 147,271 | ​ | $ | — | ​ | $ | (19,271) | ​ | $ | 128,000 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,333,263 | ​ | ​ | — | ​ | ​ | (188,925) | ​ | ​ | 1,144,338 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 419,838 | ​ | ​ | — | ​ | ​ | (58,371) | ​ | ​ | 361,467 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 349,860 | ​ | ​ | — | ​ | ​ | (61,691) | ​ | ​ | 288,169 | ​
Small Business Administration loan-backed securities | ​ | ​ | 51,075 | ​ | ​ | — | ​ | ​ | (9,303) | ​ | ​ | 41,772 | ​
​ | ​ | $ | 2,301,307 | ​ | $ | — | ​ | $ | (337,561) | ​ | $ | 1,963,746 | ​
December 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,267 | ​ | $ | — | ​ | $ | (24,607) | ​ | $ | 172,660 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,438,102 | ​ | ​ | — | ​ | ​ | (227,312) | ​ | ​ | 1,210,790 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 444,883 | ​ | ​ | — | ​ | ​ | (68,139) | ​ | ​ | 376,744 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 354,055 | ​ | ​ | — | ​ | ​ | (71,327) | ​ | ​ | 282,728 | ​
Small Business Administration loan-backed securities | ​ | ​ | 53,133 | ​ | ​ | — | ​ | ​ | (11,319) | ​ | ​ | 41,814 | ​
​ | ​ | $ | 2,487,440 | ​ | $ | — | ​ | $ | (402,704) | ​ | $ | 2,084,736 | ​
Schedule of amortized cost and fair value of investment securities available for sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
September 30, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 2,684 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 2,685 | ​
U.S. Government agencies | ​ | ​ | 191,177 | ​ | ​ | — | ​ | ​ | (15,453) | ​ | ​ | 175,724 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,702,457 | ​ |  | 491 | ​ |  | (216,862) | ​ |  | 1,486,086 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 574,447 | ​ | ​ | 49 | ​ | ​ | (82,254) | ​ | ​ | 492,242 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,215,415 | ​ | ​ | 2,545 | ​ | ​ | (157,131) | ​ | ​ | 1,060,829 | ​
State and municipal obligations | ​ |  | 1,123,634 | ​ |  | 63 | ​ |  | (134,394) | ​ |  | 989,303 | ​
Small Business Administration loan-backed securities | ​ |  | 363,885 | ​ |  | 57 | ​ |  | (34,432) | ​ |  | 329,510 | ​
Corporate securities | ​ | ​ | 30,499 | ​ | ​ | — | ​ | ​ | (2,515) | ​ | ​ | 27,984 | ​
​ | ​ | $ | 5,204,198 | ​ | $ | 3,206 | ​ | $ | (643,041) | ​ | $ | 4,564,363 | ​
December 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 74,720 | ​ | $ | — | ​ | $ | (830) | ​ | $ | 73,890 | ​
U.S. Government agencies | ​ | ​ | 246,089 | ​ | ​ | — | ​ | ​ | (21,383) | ​ | ​ | 224,706 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,822,104 | ​ |  | 294 | ​ |  | (264,092) | ​ |  | 1,558,306 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 626,735 | ​ | ​ | — | ​ | ​ | (99,313) | ​ | ​ | 527,422 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,217,125 | ​ | ​ | 1,516 | ​ | ​ | (194,471) | ​ | ​ | 1,024,170 | ​
State and municipal obligations | ​ | ​ | 1,129,750 | ​ |  | 2 | ​ |  | (152,291) | ​ |  | 977,461 | ​
Small Business Administration loan-backed securities | ​ |  | 413,950 | ​ |  | 86 | ​ |  | (42,350) | ​ |  | 371,686 | ​
Corporate securities | ​ |  | 30,533 | ​ | ​ | — | ​ | ​ | (3,786) | ​ | ​ | 26,747 | ​
​ | ​ | $ | 5,561,006 | ​ | $ | 1,898 | ​ | $ | (778,516) | ​ | $ | 4,784,388 | ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
September 30, 2024: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 32,336 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other investment securities | ​ |  | 25,298 | ​
​ | ​ | $ | 211,458 | ​
December 31, 2023: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 22,836 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other investment securities | ​ |  | 15,383 | ​
​ | ​ | $ | 192,043 | ​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities | ​ | Securities |
​ | ​ | Held to Maturity | ​ | Available for Sale |
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Value |  | Cost |  | Value |
Due in one year or less |  | $ | 14,365 | ​ | $ | 14,222 |  | $ | 84,976 |  | $ | 84,297 | ​
Due after one year through five years | ​ |  | 36,471 | ​ |  | 33,648 | ​ |  | 341,428 | ​ |  | 327,521 | ​
Due after five years through ten years | ​ |  | 444,858 | ​ |  | 393,780 | ​ |  | 1,217,855 | ​ |  | 1,084,899 | ​
Due after ten years | ​ |  | 1,805,613 | ​ |  | 1,522,096 | ​ |  | 3,559,939 | ​ |  | 3,067,646 | ​
​ | ​ | $ | 2,301,307 | ​ | $ | 1,963,746 | ​ | $ | 5,204,198 | ​ | $ | 4,564,363 | ​
Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than | ​ | Twelve Months |
​ | ​ | Twelve Months | ​ | or More |
​ | ​ | Gross Unrealized | ​ | Fair | ​ | Gross Unrealized | ​ | Fair |
(Dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |
September 30, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 19,271 | ​ | $ | 128,000 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 188,925 | ​ | ​ | 1,144,338 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 58,371 | ​ |  | 361,467 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 61,691 | ​ | ​ | 288,169 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,303 | ​ | ​ | 41,772 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 337,561 | ​ | $ | 1,963,746 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries (1) | ​ | $ | — | ​ | $ | 696 | ​ | $ | — | ​ | $ | — | ​
U.S. Government agencies | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,453 | ​ | ​ | 175,724 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 80 | ​ | ​ | 17,925 | ​ | ​ | 216,781 | ​ | ​ | 1,452,928 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 82,254 | ​ |  | 487,928 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | — | ​ | ​ | — | ​ | ​ | 157,131 | ​ | ​ | 958,412 | ​
State and municipal obligations | ​ |  | 1,259 | ​ | ​ | 17,464 | ​ | ​ | 133,136 | ​ | ​ | 960,941 | ​
Small Business Administration loan-backed securities | ​ |  | 2 | ​ | ​ | 684 | ​ | ​ | 34,430 | ​ | ​ | 311,253 | ​
Corporate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,515 | ​ | ​ | 27,984 | ​
​ | ​ | $ | 1,341 | ​ | $ | 36,769 | ​ | $ | 641,700 | ​ | $ | 4,375,170 | ​
December 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 24,607 | ​ | $ | 172,660 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 227,312 | ​ | ​ | 1,210,790 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 68,139 | ​ |  | 376,745 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 71,327 | ​ | ​ | 282,728 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,319 | ​ | ​ | 41,814 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 402,704 | ​ | $ | 2,084,737 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | — | ​ | $ | — | ​ | $ | 830 | ​ | $ | 73,890 | ​
U.S. Government agencies | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 21,383 | ​ | ​ | 224,706 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 122 | ​ | ​ | 9,358 | ​ | ​ | 263,970 | ​ | ​ | 1,539,208 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 99,313 | ​ |  | 527,422 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 91 | ​ | ​ | 7,959 | ​ | ​ | 194,380 | ​ | ​ | 955,059 | ​
State and municipal obligations | ​ | ​ | 177 | ​ | ​ | 6,340 | ​ | ​ | 152,114 | ​ | ​ | 967,305 | ​
Small Business Administration loan-backed securities | ​ | ​ | 128 | ​ | ​ | 42,447 | ​ | ​ | 42,222 | ​ | ​ | 304,770 | ​
Corporate securities | ​ |  | 18 | ​ | ​ | 480 | ​ | ​ | 3,768 | ​ | ​ | 26,267 | ​
​ | ​ | $ | 536 | ​ | $ | 66,584 | ​ | $ | 777,980 | ​ | $ | 4,618,627 | ​
| (1) | The U.S. Treasury securities in a continuous unrealized losses position for less than twelve months at September 30, 2024, had a combined gross unrealized loss total of less than $1,000.
Schedule of trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31, | ​
(Dollars in thousands) |  | 2024 |  | 2023 | ​
U.S. Government agencies | ​ | $ | 10,730 | ​ | $ | 1,537 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 15,969 | ​ | ​ | 14,461 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 24,344 | ​ | ​ | — | ​
State and municipal obligations | ​ | ​ | 26,347 | ​ | ​ | 14,620 | ​
Small Business Administration loan-backed securities | ​ | ​ | 8,552 | ​ | ​ | — | ​
Other debt securities | ​ | ​ | 1,161 | ​ | ​ | 703 | ​
​ | ​ | $ | 87,103 | ​ | $ | 31,321 | ​
Summary of net losses on trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(Dollars in thousands) |  | 2024 |  | 2023 | ​ | 2024 | ​ | 2023 | ​
Net gains (losses) on sales transaction | ​ | $ | 533 | ​ | $ | (76) | ​ | $ | 757 | ​ | $ | (116) | ​
Net mark to mark (losses) gains | ​ | ​ | (167) | ​ | ​ | 176 | ​ | ​ | (478) | ​ | ​ | (25) | ​
Net gains (losses) on trading securities | ​ | $ | 366 | ​ | $ | 100 | ​ | $ | 279 | ​ | $ | (141) | ​
​

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