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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2025: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 132,911 | ​ | $ | — | ​ | $ | (16,729) | ​ | $ | 116,182 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,187,818 | ​ | ​ | — | ​ | ​ | (186,684) | ​ | ​ | 1,001,134 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 386,777 | ​ | ​ | — | ​ | ​ | (58,177) | ​ | ​ | 328,600 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 342,054 | ​ | ​ | — | ​ | ​ | (60,516) | ​ | ​ | 281,538 | ​
Small Business Administration loan-backed securities | ​ | ​ | 47,167 | ​ | ​ | — | ​ | ​ | (9,134) | ​ | ​ | 38,033 | ​
​ | ​ | $ | 2,096,727 | ​ | $ | — | ​ | $ | (331,240) | ​ | $ | 1,765,487 | ​
December 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 147,272 | ​ | $ | — | ​ | $ | (23,498) | ​ | $ | 123,774 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,297,543 | ​ | ​ | — | ​ | ​ | (241,204) | ​ | ​ | 1,056,339 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 411,721 | ​ | ​ | — | ​ | ​ | (72,057) | ​ | ​ | 339,664 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 348,338 | ​ | ​ | — | ​ | ​ | (72,391) | ​ | ​ | 275,947 | ​
Small Business Administration loan-backed securities | ​ | ​ | 49,796 | ​ | ​ | — | ​ | ​ | (10,993) | ​ | ​ | 38,803 | ​
​ | ​ | $ | 2,254,670 | ​ | $ | — | ​ | $ | (420,143) | ​ | $ | 1,834,527 | ​
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, 2025: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | $ | 1,689,961 | ​ | $ | 7,641 | ​ | $ | (147,237) | ​ | $ | 1,550,365 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 2,268,056 | ​ | ​ | 18,908 | ​ | ​ | (49,790) | ​ | ​ | 2,237,174 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 749,857 | ​ | ​ | 2,809 | ​ | ​ | (77,054) | ​ | ​ | 675,612 | ​
State and municipal obligations | ​ |  | 1,112,505 | ​ |  | 754 | ​ |  | (152,147) | ​ |  | 961,112 | ​
Small Business Administration loan-backed securities | ​ |  | 619,437 | ​ |  | 528 | ​ |  | (28,405) | ​ |  | 591,560 | ​
Corporate securities | ​ | ​ | 28,499 | ​ | ​ | 1 | ​ | ​ | (1,523) | ​ | ​ | 26,977 | ​
​ | ​ | $ | 6,468,315 | ​ | $ | 30,641 | ​ | $ | (456,156) | ​ | $ | 6,042,800 | ​
December 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 10,654 | ​ | $ | 2 | ​ | $ | — | ​ | $ | 10,656 | ​
U.S. Government agencies | ​ | ​ | 169,207 | ​ | ​ | — | ​ | ​ | (18,789) | ​ | ​ | 150,418 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,659,851 | ​ |  | 97 | ​ |  | (282,423) | ​ |  | 1,377,525 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 557,288 | ​ | ​ | 19 | ​ | ​ | (98,212) | ​ | ​ | 459,095 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,234,573 | ​ | ​ | 562 | ​ | ​ | (194,580) | ​ | ​ | 1,040,555 | ​
State and municipal obligations | ​ | ​ | 1,117,330 | ​ |  | 2 | ​ |  | (171,609) | ​ |  | 945,723 | ​
Small Business Administration loan-backed securities | ​ |  | 351,814 | ​ |  | 19 | ​ |  | (41,721) | ​ |  | 310,112 | ​
Corporate securities | ​ |  | 28,499 | ​ | ​ | — | ​ | ​ | (1,990) | ​ | ​ | 26,509 | ​
​ | ​ | $ | 5,129,216 | ​ | $ | 701 | ​ | $ | (809,324) | ​ | $ | 4,320,593 | ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
September 30, 2025: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 18,086 | ​
Federal Reserve Bank stock | ​ | ​ | 234,374 | ​
Investment in unconsolidated subsidiaries | ​ |  | 5,287 | ​
Other investment securities | ​ |  | 108,471 | ​
​ | ​ | $ | 366,218 | ​
December 31, 2024: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 18,087 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other investment securities | ​ |  | 51,702 | ​
​ | ​ | $ | 223,613 | ​
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 |  | $ | — | ​ | $ | — |  | $ | 34,325 |  | $ | 34,214 | ​
Due after one year through five years | ​ |  | 94,797 | ​ |  | 87,406 | ​ |  | 323,617 | ​ |  | 322,072 | ​
Due after five years through ten years | ​ |  | 381,000 | ​ |  | 337,485 | ​ |  | 800,111 | ​ |  | 744,473 | ​
Due after ten years | ​ |  | 1,620,930 | ​ |  | 1,340,596 | ​ |  | 5,310,262 | ​ |  | 4,942,041 | ​
​ | ​ | $ | 2,096,727 | ​ | $ | 1,765,487 | ​ | $ | 6,468,315 | ​ | $ | 6,042,800 | ​
Schedule of information with respect to sales of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, | ​
​ | ​ | 2025 |
(Dollars in thousands) | ​ | Sales of Securities Acquired from Independent | ​ | Investment Securities Sales | ​ | Total | ​
Sale proceeds | ​ | $ | 1,279,717 |  | $ | 1,594,393 | ​ | $ | 2,874,110 | ​
Gross realized gains | ​ | ​ | — | ​ | ​ | 8,892 | ​ | ​ | 8,892 | ​
Gross realized losses | ​ |  | — | ​ |  | (237,703) | ​ |  | (237,703) | ​
Net realized losses | ​ | $ | — | ​ | $ | (228,811) | ​ | $ | (228,811) | ​
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, 2025: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 16,729 | ​ | $ | 116,182 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 186,684 | ​ | ​ | 1,001,134 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 58,177 | ​ |  | 328,600 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 60,516 | ​ | ​ | 281,538 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,134 | ​ | ​ | 38,033 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 331,240 | ​ | $ | 1,765,487 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | $ | 484 | ​ | $ | 64,033 | ​ | $ | 146,753 | ​ | $ | 839,764 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 121 | ​ |  | 102,208 | ​ |  | 49,669 | ​ |  | 302,001 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 268 | ​ | ​ | 56,511 | ​ | ​ | 76,786 | ​ | ​ | 415,144 | ​
State and municipal obligations | ​ |  | 372 | ​ | ​ | 9,326 | ​ | ​ | 151,775 | ​ | ​ | 900,630 | ​
Small Business Administration loan-backed securities | ​ |  | 1,520 | ​ | ​ | 318,038 | ​ | ​ | 26,885 | ​ | ​ | 205,350 | ​
Corporate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,523 | ​ | ​ | 26,477 | ​
​ | ​ | $ | 2,765 | ​ | $ | 550,116 | ​ | $ | 453,391 | ​ | $ | 2,689,366 | ​
December 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 23,498 | ​ | $ | 123,774 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 241,204 | ​ | ​ | 1,056,339 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 72,057 | ​ |  | 339,664 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 72,391 | ​ | ​ | 275,947 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,993 | ​ | ​ | 38,803 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 420,143 | ​ | $ | 1,834,527 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
U.S. Government agencies | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,789 | ​ | ​ | 150,418 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 294 | ​ | ​ | 14,341 | ​ | ​ | 282,129 | ​ | ​ | 1,350,268 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 98,212 | ​ |  | 454,908 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 792 | ​ | ​ | 53,342 | ​ | ​ | 193,788 | ​ | ​ | 918,338 | ​
State and municipal obligations | ​ | ​ | 1,484 | ​ | ​ | 19,400 | ​ | ​ | 170,125 | ​ | ​ | 923,431 | ​
Small Business Administration loan-backed securities | ​ | ​ | 24 | ​ | ​ | 6,747 | ​ | ​ | 41,697 | ​ | ​ | 289,786 | ​
Corporate securities | ​ |  | — | ​ | ​ | — | ​ | ​ | 1,990 | ​ | ​ | 26,509 | ​
​ | ​ | $ | 2,594 | ​ | $ | 93,830 | ​ | $ | 806,730 | ​ | $ | 4,113,658 | ​
Schedule of trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31, | ​
(Dollars in thousands) |  | 2025 |  | 2024 | ​
U.S. Government agencies | ​ | $ | 16,480 | ​ | $ | 15,002 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 5,753 | ​ | ​ | 14,803 | ​
Other residential mortgage issued or guaranteed by U.S. government | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ |  | 5,017 | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 15,222 | ​ | ​ | 14,419 | ​
State and municipal obligations | ​ | ​ | 37,195 | ​ | ​ | 35,896 | ​
Small Business Administration loan-backed securities | ​ | ​ | 27,285 | ​ | ​ | 22,571 | ​
Other debt securities | ​ | ​ | 567 | ​ | ​ | 241 | ​
​ | ​ | $ | 107,519 | ​ | $ | 102,932 | ​

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
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