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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,261 | ​ | $ | — | ​ | $ | (30,091) | ​ | $ | 167,170 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,632,761 | ​ | ​ | — | ​ | ​ | (267,505) | ​ | ​ | 1,365,256 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 483,436 | ​ | ​ | 691 | ​ | ​ | (64,602) | ​ | ​ | 419,525 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 366,227 | ​ | ​ | — | ​ | ​ | (66,366) | ​ | ​ | 299,861 | ​
Small Business Administration loan-backed securities | ​ | ​ | 58,493 | ​ | ​ | — | ​ | ​ | (11,143) | ​ | ​ | 47,350 | ​
​ | ​ | $ | 2,738,178 | ​ | $ | 691 | ​ | $ | (439,707) | ​ | $ | 2,299,162 | ​
December 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 112,913 | ​ | $ | — | ​ | $ | (2,627) | ​ | $ | 110,286 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,120,104 | ​ | ​ | 14 | ​ | ​ | (24,278) | ​ | ​ | 1,095,840 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 174,178 | ​ | ​ | — | ​ | ​ | (4,937) | ​ | ​ | 169,241 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 350,116 | ​ | ​ | 304 | ​ | ​ | (8,021) | ​ | ​ | 342,399 | ​
Small Business Administration loan-backed securities | ​ | ​ | 62,590 | ​ | ​ | — | ​ | ​ | (2,292) | ​ | ​ | 60,298 | ​
​ | ​ | $ | 1,819,901 | ​ | $ | 318 | ​ | $ | (42,155) | ​ | $ | 1,778,064 | ​
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, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 271,783 | ​ | $ | — | ​ | $ | (7,358) | ​ | $ | 264,425 | ​
U.S. Government agencies | ​ | ​ | 245,943 | ​ | ​ | — | ​ | ​ | (27,320) | ​ | ​ | 218,623 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 2,048,537 | ​ |  | — | ​ |  | (318,470) | ​ |  | 1,730,067 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 729,712 | ​ | ​ | 6 | ​ | ​ | (101,906) | ​ | ​ | 627,812 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,224,869 | ​ | ​ | 2,551 | ​ | ​ | (199,644) | ​ | ​ | 1,027,776 | ​
State and municipal obligations | ​ |  | 1,256,045 | ​ |  | 23 | ​ |  | (252,750) | ​ |  | 1,003,318 | ​
Small Business Administration loan-backed securities | ​ |  | 507,412 | ​ |  | 546 | ​ |  | (43,722) | ​ |  | 464,236 | ​
Corporate securities | ​ | ​ | 35,595 | ​ | ​ | 10 | ​ | ​ | (2,252) | ​ | ​ | 33,353 | ​
​ | ​ | $ | 6,319,896 | ​ | $ | 3,136 | ​ | $ | (953,422) | ​ | $ | 5,369,610 | ​
December 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 98,882 | ​ | $ | — | ​ | $ | (1,765) | ​ | $ | 97,117 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,851,700 | ​ |  | 5,324 | ​ |  | (25,985) | ​ |  | 1,831,039 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 730,949 | ​ | ​ | 5,957 | ​ | ​ | (10,911) | ​ | ​ | 725,995 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,220,233 | ​ | ​ | 5,438 | ​ | ​ | (18,430) | ​ | ​ | 1,207,241 | ​
State and municipal obligations | ​ | ​ | 798,211 | ​ |  | 16,697 | ​ |  | (2,219) | ​ |  | 812,689 | ​
Small Business Administration loan-backed securities | ​ |  | 502,812 | ​ |  | 2,330 | ​ |  | (4,479) | ​ |  | 500,663 | ​
Corporate securities | ​ |  | 18,509 | ​ | ​ | 234 | ​ | ​ | (9) | ​ | ​ | 18,734 | ​
​ | ​ | $ | 5,221,296 | ​ | $ | 35,980 | ​ | $ | (63,798) | ​ | $ | 5,193,478 | ​
Schedule of amortized cost and carrying value of other investment securities |
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
September 30, 2022: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 15,095 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 10,836 | ​
​ | ​ | $ | 179,755 | ​
December 31, 2021: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 16,283 | ​
Federal Reserve Bank stock | ​ | ​ | 129,716 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 11,006 | ​
​ | ​ | $ | 160,568 | ​
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 |  | $ | — | ​ | $ | — |  | $ | 107,230 |  | $ | 105,253 | ​
Due after one year through five years | ​ |  | 101,152 | ​ |  | 92,747 | ​ |  | 487,512 | ​ |  | 466,754 | ​
Due after five years through ten years | ​ |  | 359,629 | ​ |  | 321,679 | ​ |  | 1,149,845 | ​ |  | 999,829 | ​
Due after ten years | ​ |  | 2,277,397 | ​ |  | 1,884,736 | ​ |  | 4,575,309 | ​ |  | 3,797,774 | ​
​ | ​ | $ | 2,738,178 | ​ | $ | 2,299,162 | ​ | $ | 6,319,896 | ​ | $ | 5,369,610 | ​
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, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 10,903 | ​ | $ | 98,443 | ​ | $ | 19,188 | ​ | $ | 68,727 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 90,161 | ​ | ​ | 627,193 | ​ | ​ | 177,344 | ​ | ​ | 738,063 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 34,942 | ​ |  | 265,792 | ​ |  | 29,660 | ​ |  | 104,370 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 21,199 | ​ | ​ | 113,354 | ​ | ​ | 45,167 | ​ | ​ | 186,507 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,143 | ​ | ​ | 47,350 | ​
​ | ​ | $ | 157,205 | ​ | $ | 1,104,782 | ​ | $ | 282,502 | ​ | $ | 1,145,017 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 7,358 | ​ | $ | 264,425 | ​ | $ | — | ​ | $ | — | ​
U.S. Government agencies | ​ | ​ | 12,248 | ​ | ​ | 159,395 | ​ | ​ | 15,072 | ​ | ​ | 59,228 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 122,435 | ​ | ​ | 874,957 | ​ | ​ | 196,035 | ​ | ​ | 854,926 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 35,684 | ​ |  | 368,713 | ​ |  | 66,222 | ​ |  | 257,017 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 66,849 | ​ | ​ | 463,425 | ​ | ​ | 132,795 | ​ | ​ | 528,853 | ​
State and municipal obligations | ​ |  | 223,328 | ​ | ​ | 917,487 | ​ | ​ | 29,422 | ​ | ​ | 75,275 | ​
Small Business Administration loan-backed securities | ​ |  | 18,118 | ​ | ​ | 167,715 | ​ | ​ | 25,604 | ​ | ​ | 178,604 | ​
Corporate securities | ​ | ​ | 2,252 | ​ | ​ | 28,343 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 488,272 | ​ | $ | 3,244,460 | ​ | $ | 465,150 | ​ | $ | 1,953,903 | ​
December 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,745 | ​ | $ | 86,168 | ​ | $ | 882 | ​ | $ | 24,118 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 18,768 | ​ | ​ | 868,327 | ​ | ​ | 5,510 | ​ | ​ | 184,819 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 4,937 | ​ |  | 169,240 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 4,902 | ​ | ​ | 154,963 | ​ | ​ | 3,119 | ​ | ​ | 75,450 | ​
Small Business Administration loan-backed securities | ​ | ​ | 1,281 | ​ | ​ | 37,408 | ​ | ​ | 1,011 | ​ | ​ | 22,890 | ​
​ | ​ | $ | 31,633 | ​ | $ | 1,316,106 | ​ | $ | 10,522 | ​ | $ | 307,277 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 529 | ​ | $ | 73,353 | ​ | $ | 1,236 | ​ | $ | 23,763 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 17,381 | ​ | ​ | 1,274,934 | ​ | ​ | 8,604 | ​ | ​ | 221,435 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 10,911 | ​ |  | 432,300 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 13,120 | ​ | ​ | 846,581 | ​ | ​ | 5,310 | ​ | ​ | 98,106 | ​
State and municipal obligations | ​ | ​ | 1,867 | ​ | ​ | 123,987 | ​ | ​ | 352 | ​ | ​ | 8,579 | ​
Small Business Administration loan-backed securities | ​ | ​ | 2,720 | ​ | ​ | 179,168 | ​ | ​ | 1,759 | ​ | ​ | 110,309 | ​
Corporate securities | ​ |  | 9 | ​ | ​ | 4,991 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 46,537 | ​ | $ | 2,935,314 | ​ | $ | 17,261 | ​ | $ | 462,192 | ​
Schedule of trading securities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31, | ​
(Dollars in thousands) |  | 2022 |  | 2021 | ​
U.S. Government agencies | ​ | $ | 12,017 | ​ | $ | 5,154 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 11,556 | ​ | ​ | 6,853 | ​
Other residential mortgage issued or guaranteed by U.S. government | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ |  | 5,921 | ​ |  | 12,315 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 3,116 | ​ | ​ | 29,667 | ​
State and municipal obligations | ​ | ​ | 18,060 | ​ | ​ | 20,798 | ​
Other debt securities | ​ | ​ | 1,270 | ​ | ​ | 2,902 | ​
​ | ​ | $ | 51,940 | ​ | $ | 77,689 | ​
Summary of net (losses) gains on trading securities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
(Dollars in thousands) |  | 2022 |  | 2021 | ​ | 2022 | ​ | 2021 | ​
Net gains (losses) on sales transaction | ​ | $ | 76 | ​ | $ | 489 | ​ | $ | (1,544) | ​ | $ | 944 | ​
Net mark to mark gains (losses) | ​ | ​ | 465 | ​ | ​ | (693) | ​ | ​ | (1,969) | ​ | ​ | (882) | ​
Net gains (losses) on trading securities | ​ | $ | 541 | ​ | $ | (204) | ​ | $ | (3,513) | ​ | $ | 62 | ​

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