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Securities (Tables) | 3 Months Ended
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Mar. 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 |
March 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 197,264 | ​ | $ | — | ​ | $ | (28,175) | ​ | $ | 169,089 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,553,373 | ​ | ​ | — | ​ | ​ | (238,470) | ​ | ​ | 1,314,903 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 468,794 | ​ | ​ | — | ​ | ​ | (63,317) | ​ | ​ | 405,477 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 360,962 | ​ | ​ | — | ​ | ​ | (68,141) | ​ | ​ | 292,821 | ​
Small Business Administration loan-backed securities | ​ | ​ | 56,280 | ​ | ​ | — | ​ | ​ | (10,958) | ​ | ​ | 45,322 | ​
​ | ​ | $ | 2,636,673 | ​ | $ | — | ​ | $ | (409,061) | ​ | $ | 2,227,612 | ​
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 |
March 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | 273,035 | ​ | $ | — | ​ | $ | (4,939) | ​ | $ | 268,096 | ​
U.S. Government agencies | ​ | ​ | 246,001 | ​ | ​ | — | ​ | ​ | (25,742) | ​ | ​ | 220,259 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,951,725 | ​ |  | — | ​ |  | (278,563) | ​ |  | 1,673,162 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 689,575 | ​ | ​ | — | ​ | ​ | (98,163) | ​ | ​ | 591,412 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,180,323 | ​ | ​ | 8 | ​ | ​ | (192,894) | ​ | ​ | 987,437 | ​
State and municipal obligations | ​ |  | 1,138,809 | ​ |  | 4 | ​ |  | (171,856) | ​ |  | 966,957 | ​
Small Business Administration loan-backed securities | ​ |  | 466,462 | ​ |  | 194 | ​ |  | (41,164) | ​ |  | 425,492 | ​
Corporate securities | ​ | ​ | 30,571 | ​ | ​ | — | ​ | ​ | (3,387) | ​ | ​ | 27,184 | ​
​ | ​ | $ | 5,976,501 | ​ | $ | 206 | ​ | $ | (816,708) | ​ | $ | 5,159,999 | ​
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 |
March 31, 2023: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 53,335 | ​
Federal Reserve Bank stock | ​ | ​ | 150,261 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 10,832 | ​
​ | ​ | $ | 217,991 | ​
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 |  | $ | — | ​ | $ | — |  | $ | 254,326 |  | $ | 250,191 | ​
Due after one year through five years | ​ |  | 101,073 | ​ |  | 94,058 | ​ |  | 309,053 | ​ |  | 295,225 | ​
Due after five years through ten years | ​ |  | 382,261 | ​ |  | 337,412 | ​ |  | 1,148,155 | ​ |  | 1,001,653 | ​
Due after ten years | ​ |  | 2,153,339 | ​ |  | 1,796,142 | ​ |  | 4,264,967 | ​ |  | 3,612,930 | ​
​ | ​ | $ | 2,636,673 | ​ | $ | 2,227,612 | ​ | $ | 5,976,501 | ​ | $ | 5,159,999 | ​
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, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 28,175 | ​ | $ | 169,089 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 238,470 | ​ | ​ | 1,314,903 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,187 | ​ |  | 45,925 | ​ |  | 62,130 | ​ |  | 359,552 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 13,414 | ​ | ​ | 57,771 | ​ | ​ | 54,727 | ​ | ​ | 235,050 | ​
Small Business Administration loan-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,958 | ​ | ​ | 45,322 | ​
​ | ​ | $ | 14,601 | ​ | $ | 103,696 | ​ | $ | 394,460 | ​ | $ | 2,123,916 | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasuries | ​ | $ | — | ​ | $ | — | ​ | $ | 4,939 | ​ | $ | 268,096 | ​
U.S. Government agencies | ​ | ​ | 1,065 | ​ | ​ | 53,935 | ​ | ​ | 24,677 | ​ | ​ | 166,324 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,027 | ​ | ​ | 32,334 | ​ | ​ | 277,536 | ​ | ​ | 1,640,828 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 2,650 | ​ |  | 73,464 | ​ |  | 95,513 | ​ |  | 517,948 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 10,606 | ​ | ​ | 107,009 | ​ | ​ | 182,288 | ​ | ​ | 874,332 | ​
State and municipal obligations | ​ |  | 4,250 | ​ | ​ | 74,784 | ​ | ​ | 167,606 | ​ | ​ | 888,984 | ​
Small Business Administration loan-backed securities | ​ |  | 428 | ​ | ​ | 80,092 | ​ | ​ | 40,736 | ​ | ​ | 278,346 | ​
Corporate securities | ​ | ​ | 635 | ​ | ​ | 5,863 | ​ | ​ | 2,752 | ​ | ​ | 21,321 | ​
​ | ​ | $ | 20,661 | ​ | $ | 427,481 | ​ | $ | 796,047 | ​ | $ | 4,656,179 | ​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | December 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​
U.S. Government agencies | ​ | $ | 3,925 | ​ | $ | 11,190 | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. | ​ | ​ | ​ | ​ | ​ | ​ | ​
government agencies or sponsored enterprises | ​ | ​ | 3,439 | ​ | ​ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,304 | ​ | ​ | 4,589 | ​
State and municipal obligations | ​ | ​ | 7,122 | ​ | ​ | 13,993 | ​
Other debt securities | ​ | ​ | 249 | ​ | ​ | 1,491 | ​
​ | ​ | $ | 16,039 | ​ | $ | 31,263 | ​
Summary of net (losses) gains on trading securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​
Net losses on sales transaction | ​ | $ | (139) | ​ | $ | (1,239) | ​
Net mark to mark losses | ​ | ​ | (6) | ​ | ​ | (1,976) | ​
Net losses on trading securities | ​ | $ | (145) | ​ | $ | (3,215) | ​

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