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Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
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 |
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 | ​
December 31, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,262 | ​ | $ | — | ​ | $ | (29,787) | ​ | $ | 167,475 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,591,646 | ​ | ​ | — | ​ | ​ | (255,093) | ​ | ​ | 1,336,553 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 474,660 | ​ | ​ | — | ​ | ​ | (69,664) | ​ | ​ | 404,996 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 362,586 | ​ | ​ | — | ​ | ​ | (66,304) | ​ | ​ | 296,282 | ​
Small Business Administration loan-backed securities | ​ | ​ | 57,087 | ​ | ​ | — | ​ | ​ | (12,225) | ​ | ​ | 44,862 | ​
​ | ​ | $ | 2,683,241 | ​ | $ | — | ​ | $ | (433,073) | ​ | $ | 2,250,168 | ​
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 |
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 | ​
December 31, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 272,416 | ​ | $ | — | ​ | $ | (6,778) | ​ | $ | 265,638 | ​
U.S. Government agencies | ​ | ​ | 245,972 | ​ | ​ | — | ​ | ​ | (26,884) | ​ | ​ | 219,088 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,996,405 | ​ |  | — | ​ |  | (298,052) | ​ |  | 1,698,353 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 708,337 | ​ | ​ | — | ​ | ​ | (107,292) | ​ | ​ | 601,045 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,196,700 | ​ | ​ | 2,542 | ​ | ​ | (198,844) | ​ | ​ | 1,000,398 | ​
State and municipal obligations | ​ | ​ | 1,269,525 | ​ |  | 1,210 | ​ |  | (205,883) | ​ |  | 1,064,852 | ​
Small Business Administration loan-backed securities | ​ |  | 491,203 | ​ |  | 302 | ​ |  | (46,695) | ​ |  | 444,810 | ​
Corporate securities | ​ |  | 35,583 | ​ | ​ | — | ​ | ​ | (2,945) | ​ | ​ | 32,638 | ​
​ | ​ | $ | 6,216,141 | ​ | $ | 4,054 | ​ | $ | (893,373) | ​ | $ | 5,326,822 | ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
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 | ​
December 31, 2022: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 15,085 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 10,808 | ​
​ | ​ | $ | 179,717 | ​
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 |  | $ | 50,000 | ​ | $ | 49,222 |  | $ | 158,338 |  | $ | 156,418 | ​
Due after one year through five years | ​ |  | 50,955 | ​ |  | 46,440 | ​ |  | 267,073 | ​ |  | 254,908 | ​
Due after five years through ten years | ​ |  | 480,806 | ​ |  | 414,831 | ​ |  | 1,343,076 | ​ |  | 1,165,142 | ​
Due after ten years | ​ |  | 1,905,679 | ​ |  | 1,574,243 | ​ |  | 3,792,519 | ​ |  | 3,207,920 | ​
​ | ​ | $ | 2,487,440 | ​ | $ | 2,084,736 | ​ | $ | 5,561,006 | ​ | $ | 4,784,388 | ​
Schedule of information with respect to sales of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021 |
Securities Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Sale proceeds |  | $ | 129,614 |  | $ | 482,028 |  | $ | 151,314 | ​
Gross realized gains | ​ | ​ | 1,335 | ​ | ​ | 103 | ​ | ​ | 750 | ​
Gross realized losses | ​ |  | (1,292) | ​ |  | (73) | ​ |  | (648) | ​
Net realized gain | ​ | $ | 43 | ​ | $ | 30 | ​ | $ | 102 | ​
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 |
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 | ​
December 31, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 5,514 | ​ | $ | 78,833 | ​ | $ | 24,273 | ​ | $ | 88,642 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 65,181 | ​ | ​ | 513,086 | ​ | ​ | 189,912 | ​ | ​ | 823,467 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 30,284 | ​ |  | 277,868 | ​ |  | 39,380 | ​ |  | 127,128 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 14,318 | ​ | ​ | 82,895 | ​ | ​ | 51,986 | ​ | ​ | 213,387 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 12,225 | ​ | ​ | 44,862 | ​
​ | ​ | $ | 115,297 | ​ | $ | 952,682 | ​ | $ | 317,776 | ​ | $ | 1,297,486 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 6,778 | ​ | $ | 265,638 | ​ | $ | — | ​ | $ | — | ​
U.S. Government agencies | ​ | ​ | 8,193 | ​ | ​ | 138,807 | ​ | ​ | 18,691 | ​ | ​ | 80,281 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 42,767 | ​ | ​ | 459,773 | ​ | ​ | 255,285 | ​ | ​ | 1,238,580 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 21,450 | ​ |  | 274,082 | ​ |  | 85,842 | ​ |  | 326,963 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 17,156 | ​ | ​ | 206,228 | ​ | ​ | 181,688 | ​ | ​ | 767,002 | ​
State and municipal obligations | ​ | ​ | 97,084 | ​ | ​ | 616,631 | ​ | ​ | 108,799 | ​ | ​ | 391,848 | ​
Small Business Administration loan-backed securities | ​ | ​ | 2,152 | ​ | ​ | 92,535 | ​ | ​ | 44,543 | ​ | ​ | 264,933 | ​
Corporate securities | ​ |  | 2,209 | ​ | ​ | 28,374 | ​ | ​ | 736 | ​ | ​ | 4,264 | ​
​ | ​ | $ | 197,789 | ​ | $ | 2,082,068 | ​ | $ | 695,584 | ​ | $ | 3,073,871 | ​
Schedule of trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, | ​ | December 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​
U.S. Government agencies | ​ | $ | 1,537 | ​ | $ | 11,190 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 14,461 | ​ | ​ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | 4,589 | ​
State and municipal obligations | ​ | ​ | 14,620 | ​ | ​ | 13,993 | ​
Other debt securities | ​ | ​ | 703 | ​ | ​ | 1,491 | ​
​ | ​ | $ | 31,321 | ​ | $ | 31,263 | ​
Summary of net gains (losses) on trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
(Dollars in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
Net gains (losses) on sales transaction | ​ | $ | 289 | ​ | $ | (1,326) | ​ | $ | 1,326 | ​
Net mark to mark gains (losses) | ​ | ​ | 278 | ​ | ​ | (237) | ​ | ​ | (273) | ​
Net gains (losses) on trading securities | ​ | $ | 567 | ​ | $ | (1,563) | ​ | $ | 1,053 | ​
​

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