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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,266 | ​ | $ | — | ​ | $ | (33,016) | ​ | $ | 164,250 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,474,360 | ​ | ​ | — | ​ | ​ | (303,022) | ​ | ​ | 1,171,338 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 451,928 | ​ | ​ | — | ​ | ​ | (85,938) | ​ | ​ | 365,990 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 355,664 | ​ | ​ | — | ​ | ​ | (85,773) | ​ | ​ | 269,891 | ​
Small Business Administration loan-backed securities | ​ | ​ | 54,495 | ​ | ​ | — | ​ | ​ | (13,564) | ​ | ​ | 40,931 | ​
​ | ​ | $ | 2,533,713 | ​ | $ | — | ​ | $ | (521,313) | ​ | $ | 2,012,400 | ​
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 |
September 30, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 174,322 | ​ | $ | — | ​ | $ | (2,063) | ​ | $ | 172,259 | ​
U.S. Government agencies | ​ | ​ | 246,059 | ​ | ​ | — | ​ | ​ | (29,305) | ​ | ​ | 216,754 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,851,803 | ​ |  | — | ​ |  | (363,097) | ​ |  | 1,488,706 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 644,581 | ​ | ​ | — | ​ | ​ | (125,154) | ​ | ​ | 519,427 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,199,936 | ​ | ​ | 3 | ​ | ​ | (250,407) | ​ | ​ | 949,532 | ​
State and municipal obligations | ​ |  | 1,132,238 | ​ |  | 1 | ​ |  | (259,232) | ​ |  | 873,007 | ​
Small Business Administration loan-backed securities | ​ |  | 429,785 | ​ |  | 120 | ​ |  | (52,435) | ​ |  | 377,470 | ​
Corporate securities | ​ | ​ | 30,546 | ​ | ​ | 1 | ​ | ​ | (4,084) | ​ | ​ | 26,463 | ​
​ | ​ | $ | 5,709,270 | ​ | $ | 125 | ​ | $ | (1,085,777) | ​ | $ | 4,623,618 | ​
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 |
September 30, 2023: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 18,085 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 15,243 | ​
​ | ​ | $ | 187,152 | ​
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 | ​ | $ | 48,682 |  | $ | 234,334 |  | $ | 231,348 | ​
Due after one year through five years | ​ |  | 50,994 | ​ |  | 44,922 | ​ |  | 256,202 | ​ |  | 239,370 | ​
Due after five years through ten years | ​ |  | 407,416 | ​ |  | 341,124 | ​ |  | 1,342,414 | ​ |  | 1,104,205 | ​
Due after ten years | ​ |  | 2,025,303 | ​ |  | 1,577,672 | ​ |  | 3,876,320 | ​ |  | 3,048,695 | ​
​ | ​ | $ | 2,533,713 | ​ | $ | 2,012,400 | ​ | $ | 5,709,270 | ​ | $ | 4,623,618 | ​
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, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 33,016 | ​ | $ | 164,250 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 303,022 | ​ | ​ | 1,171,338 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 85,938 | ​ |  | 365,990 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 85,773 | ​ | ​ | 269,891 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 13,564 | ​ | ​ | 40,931 | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 521,313 | ​ | $ | 2,012,400 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | — | ​ | $ | — | ​ | $ | 2,063 | ​ | $ | 172,259 | ​
U.S. Government agencies | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 29,305 | ​ | ​ | 216,754 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1 | ​ | ​ | 94 | ​ | ​ | 363,096 | ​ | ​ | 1,488,330 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ |  | — | ​ |  | 125,154 | ​ |  | 519,427 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 8,606 | ​ | ​ | 64,756 | ​ | ​ | 241,801 | ​ | ​ | 879,801 | ​
State and municipal obligations | ​ |  | 705 | ​ | ​ | 9,860 | ​ | ​ | 258,527 | ​ | ​ | 860,725 | ​
Small Business Administration loan-backed securities | ​ |  | 163 | ​ | ​ | 67,609 | ​ | ​ | 52,272 | ​ | ​ | 284,393 | ​
Corporate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,084 | ​ | ​ | 25,963 | ​
​ | ​ | $ | 9,475 | ​ | $ | 142,319 | ​ | $ | 1,076,302 | ​ | $ | 4,447,652 | ​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​
U.S. Government agencies | ​ | $ | 9,945 | ​ | $ | 11,190 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 21,399 | ​ | ​ | — | ​
Other residential mortgage issued or guaranteed by U.S. government | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ |  | 13,590 | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 44,910 | ​ | ​ | 4,589 | ​
State and municipal obligations | ​ | ​ | 16,059 | ​ | ​ | 13,993 | ​
Other debt securities | ​ | ​ | 8,251 | ​ | ​ | 1,491 | ​
​ | ​ | $ | 114,154 | ​ | $ | 31,263 | ​
Summary of net gains (losses) on trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​ | 2023 | ​ | 2022 | ​
Net (losses) gains on sales transaction | ​ | $ | (76) | ​ | $ | 76 | ​ | $ | (116) | ​ | $ | (1,544) | ​
Net mark to mark gains (losses) | ​ | ​ | 176 | ​ | ​ | 465 | ​ | ​ | (25) | ​ | ​ | (1,969) | ​
Net gains (losses) on trading securities | ​ | $ | 100 | ​ | $ | 541 | ​ | $ | (141) | ​ | $ | (3,513) | ​
​

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