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Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
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 |
March 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,269 | ​ | $ | — | ​ | $ | (25,821) | ​ | $ | 171,448 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,406,440 | ​ | ​ | — | ​ | ​ | (246,764) | ​ | ​ | 1,159,676 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 437,718 | ​ | ​ | — | ​ | ​ | (72,593) | ​ | ​ | 365,125 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 352,399 | ​ | ​ | — | ​ | ​ | (73,294) | ​ | ​ | 279,105 | ​
Small Business Administration loan-backed securities | ​ | ​ | 52,763 | ​ | ​ | — | ​ | ​ | (11,550) | ​ | ​ | 41,213 | ​
​ | ​ | $ | 2,446,589 | ​ | $ | — | ​ | $ | (430,022) | ​ | $ | 2,016,567 | ​
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 |
March 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 24,920 | ​ | $ | — | ​ | $ | (333) | ​ | $ | 24,587 | ​
U.S. Government agencies | ​ | ​ | 246,118 | ​ | ​ | — | ​ | ​ | (22,313) | ​ | ​ | 223,805 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,780,838 | ​ |  | 161 | ​ |  | (288,576) | ​ |  | 1,492,423 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 611,044 | ​ | ​ | 4 | ​ | ​ | (102,936) | ​ | ​ | 508,112 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,213,549 | ​ | ​ | 767 | ​ | ​ | (202,099) | ​ | ​ | 1,012,217 | ​
State and municipal obligations | ​ |  | 1,127,834 | ​ |  | 2 | ​ |  | (167,477) | ​ |  | 960,359 | ​
Small Business Administration loan-backed securities | ​ |  | 393,770 | ​ |  | 52 | ​ |  | (43,779) | ​ |  | 350,043 | ​
Corporate securities | ​ | ​ | 30,521 | ​ | ​ | — | ​ | ​ | (3,667) | ​ | ​ | 26,854 | ​
​ | ​ | $ | 5,428,594 | ​ | $ | 986 | ​ | $ | (831,180) | ​ | $ | 4,598,400 | ​
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 |
March 31, 2024: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 18,086 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 15,375 | ​
​ | ​ | $ | 187,285 | ​
December 31, 2023: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 22,836 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable 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 |  | $ | 64,365 | ​ | $ | 63,576 |  | $ | 157,891 |  | $ | 155,556 | ​
Due after one year through five years | ​ |  | 36,550 | ​ |  | 32,413 | ​ |  | 262,765 | ​ |  | 246,685 | ​
Due after five years through ten years | ​ |  | 468,529 | ​ |  | 399,174 | ​ |  | 1,295,555 | ​ |  | 1,111,329 | ​
Due after ten years | ​ |  | 1,877,145 | ​ |  | 1,521,404 | ​ |  | 3,712,383 | ​ |  | 3,084,830 | ​
​ | ​ | $ | 2,446,589 | ​ | $ | 2,016,567 | ​ | $ | 5,428,594 | ​ | $ | 4,598,400 | ​
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 |
March 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 25,821 | ​ | $ | 171,448 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 246,764 | ​ | ​ | 1,159,676 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 72,593 | ​ |  | 365,125 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 73,294 | ​ | ​ | 279,105 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,550 | ​ | ​ | 41,213 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 430,022 | ​ | $ | 2,016,567 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | — | ​ | $ | — | ​ | $ | 333 | ​ | $ | 24,597 | ​
U.S. Government agencies | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 22,313 | ​ | ​ | 223,805 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 135 | ​ | ​ | 8,878 | ​ | ​ | 288,441 | ​ | ​ | 1,473,944 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 102,936 | ​ |  | 506,900 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 63 | ​ | ​ | 14,929 | ​ | ​ | 202,036 | ​ | ​ | 932,902 | ​
State and municipal obligations | ​ |  | 1,981 | ​ | ​ | 19,989 | ​ | ​ | 165,496 | ​ | ​ | 936,573 | ​
Small Business Administration loan-backed securities | ​ |  | 62 | ​ | ​ | 16,734 | ​ | ​ | 43,717 | ​ | ​ | 317,469 | ​
Corporate securities | ​ | ​ | 10 | ​ | ​ | 489 | ​ | ​ | 3,657 | ​ | ​ | 26,366 | ​
​ | ​ | $ | 2,251 | ​ | $ | 61,019 | ​ | $ | 828,929 | ​ | $ | 4,442,556 | ​
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 | ​
Schedule of trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | December 31, | ​
(Dollars in thousands) |  | 2024 |  | 2023 | ​
U.S. Government agencies | ​ | $ | 10,352 | ​ | $ | 1,537 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 11,383 | ​ | ​ | 14,461 | ​
Other residential mortgage issued or guaranteed by U.S. government | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,148 | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 8,467 | ​ | ​ | — | ​
State and municipal obligations | ​ | ​ | 31,263 | ​ | ​ | 14,620 | ​
Other debt securities | ​ | ​ | 3,575 | ​ | ​ | 703 | ​
​ | ​ | $ | 66,188 | ​ | $ | 31,321 | ​
Summary of net gains (losses) on trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​
​ | ​ | March 31, | ​
(Dollars in thousands) |  | 2024 |  | 2023 | ​
Net gains (losses) on sales transaction | ​ | $ | 54 | ​ | $ | (139) | ​
Net mark to mark gains (losses) | ​ | ​ | 12 | ​ | ​ | (6) | ​
Net gains (losses) on trading securities | ​ | $ | 66 | ​ | $ | (145) | ​
​

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