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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 87,912 | ​ | $ | — | ​ | $ | (2,162) | ​ | $ | 85,750 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,028,847 | ​ | ​ | — | ​ | ​ | (19,505) | ​ | ​ | 1,009,342 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 144,540 | ​ | ​ | — | ​ | ​ | (4,029) | ​ | ​ | 140,511 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 316,330 | ​ | ​ | 83 | ​ | ​ | (6,586) | ​ | ​ | 309,827 | ​
Small Business Administration loan-backed securities | ​ | ​ | 63,856 | ​ | ​ | — | ​ | ​ | (2,102) | ​ | ​ | 61,754 | ​
​ | ​ | $ | 1,641,485 | ​ | $ | 83 | ​ | $ | (34,384) | ​ | $ | 1,607,184 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 25,000 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 25,001 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 632,269 | ​ | ​ | 1,827 | ​ | ​ | (1,032) | ​ | ​ | 633,064 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 75,767 | ​ | ​ | 405 | ​ | ​ | — | ​ | ​ | 76,172 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 174,506 | ​ | ​ | 300 | ​ | ​ | (91) | ​ | ​ | 174,715 | ​
Small Business Administration loan-backed securities | ​ | ​ | 48,000 | ​ | ​ | 231 | ​ | ​ | — | ​ | ​ | 48,231 | ​
​ | ​ | $ | 955,542 | ​ | $ | 2,764 | ​ | $ | (1,123) | ​ | $ | 957,183 | ​
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, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 74,336 | ​ | $ | — | ​ | $ | (1,493) | ​ | $ | 72,843 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,639,495 | ​ |  | 8,307 | ​ |  | (17,354) | ​ |  | 1,630,448 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 703,245 | ​ | ​ | 9,924 | ​ | ​ | (5,041) | ​ | ​ | 708,128 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,003,259 | ​ | ​ | 7,294 | ​ | ​ | (11,265) | ​ | ​ | 999,288 | ​
State and municipal obligations | ​ |  | 720,417 | ​ |  | 13,218 | ​ |  | (4,033) | ​ |  | 729,602 | ​
Small Business Administration loan-backed securities | ​ |  | 477,765 | ​ |  | 3,700 | ​ |  | (4,065) | ​ |  | 477,400 | ​
Corporate securities | ​ | ​ | 13,522 | ​ | ​ | 323 | ​ | ​ | — | ​ | ​ | 13,845 | ​
​ | ​ | $ | 4,632,039 | ​ | $ | 42,766 | ​ | $ | (43,251) | ​ | $ | 4,631,554 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 29,882 | ​ | $ | 16 | ​ | $ | (642) | ​ | $ | 29,256 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,351,506 | ​ | ​ | 16,657 | ​ | ​ | (1,031) | ​ | ​ | 1,367,132 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 739,797 | ​ | ​ | 16,579 | ​ | ​ | (825) | ​ | ​ | 755,551 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 229,219 | ​ | ​ | 10,939 | ​ | ​ | (50) | ​ | ​ | 240,108 | ​
State and municipal obligations | ​ | ​ | 502,575 | ​ | ​ | 17,491 | ​ | ​ | (27) | ​ | ​ | 520,039 | ​
Small Business Administration loan-backed securities | ​ |  | 401,496 | ​ |  | 4,978 | ​ |  | (1,590) | ​ |  | 404,884 | ​
Corporate securities | ​ |  | 13,562 | ​ |  | 140 | ​ |  | — | ​ |  | 13,702 | ​
​ | ​ | $ | 3,268,037 | ​ | $ | 66,800 | ​ | $ | (4,165) | ​ | $ | 3,330,672 | ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
September 30, 2021: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 16,283 | ​
Federal Reserve Bank stock | ​ | ​ | 129,716 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 11,030 | ​
​ | ​ | $ | 160,592 | ​
December 31, 2020: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 15,083 | ​
Federal Reserve Bank stock | ​ | ​ | 129,871 | ​
Investment in unconsolidated subsidiaries | ​ |  | 4,941 | ​
Other nonmarketable investment securities | ​ |  | 10,548 | ​
​ | ​ | $ | 160,443 | ​
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 |  | $ | — | ​ | $ | — |  | $ | 10,948 |  | $ | 10,998 | ​
Due after one year through five years | ​ |  | — | ​ |  | — | ​ |  | 102,771 | ​ |  | 105,345 | ​
Due after five years through ten years | ​ |  | 141,285 | ​ |  | 137,970 | ​ |  | 752,981 | ​ |  | 757,174 | ​
Due after ten years | ​ |  | 1,500,200 | ​ |  | 1,469,214 | ​ |  | 3,765,339 | ​ |  | 3,758,037 | ​
​ | ​ | $ | 1,641,485 | ​ | $ | 1,607,184 | ​ | $ | 4,632,039 | ​ | $ | 4,631,554 | ​
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 | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ |
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |
September 30, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held-to-Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 2,162 | ​ | $ | 85,750 | ​ | $ | — | ​ | $ | — | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 19,505 | ​ | ​ | 1,009,342 | ​ | ​ | — | ​ | ​ | — | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 4,029 | ​ | ​ | 140,511 | ​ | ​ | — | ​ | ​ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 6,586 | ​ | ​ | 232,991 | ​ | ​ | — | ​ | ​ | — | ​
Small Business Administration loan-backed securities | ​ | ​ | 2,102 | ​ | ​ | 61,754 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 34,384 | ​ | $ | 1,530,348 | ​ | $ | — | ​ | $ | — | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 245 | ​ | $ | 49,092 | ​ | $ | 1,248 | ​ | $ | 23,752 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 14,125 | ​ | ​ | 1,000,634 | ​ | ​ | 3,229 | ​ | ​ | 92,550 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 5,041 | ​ |  | 157,770 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 7,684 | ​ | ​ | 617,854 | ​ | ​ | 3,581 | ​ | ​ | 79,540 | ​
State and municipal obligations | ​ |  | 3,956 | ​ | ​ | 238,688 | ​ | ​ | 77 | ​ | ​ | 4,025 | ​
Small Business Administration loan-backed securities | ​ |  | 2,417 | ​ | ​ | 134,438 | ​ | ​ | 1,648 | ​ | ​ | 116,233 | ​
​ | ​ | $ | 33,468 | ​ | $ | 2,198,476 | ​ | $ | 9,783 | ​ | $ | 316,100 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held-to-Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | $ | 1,032 | ​ | $ | 213,146 | ​ | $ | — | ​ | $ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 91 | ​ | ​ | 27,445 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 1,123 | ​ | $ | 240,591 | ​ | $ | — | ​ | $ | — | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 642 | ​ | $ | 24,358 | ​ | $ | — | ​ | $ | — | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,031 | ​ | ​ | 260,411 | ​ | ​ | — | ​ | ​ | — | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 825 | ​ |  | 140,333 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 46 | ​ | ​ | 13,594 | ​ | ​ | 4 | ​ | ​ | 871 | ​
State and municipal obligations | ​ | ​ | 27 | ​ | ​ | 8,620 | ​ | ​ | — | ​ | ​ | — | ​
Small Business Administration loan-backed securities | ​ | ​ | 573 | ​ | ​ | 94,981 | ​ | ​ | 1,017 | ​ | ​ | 104,254 | ​
​ | ​ | $ | 3,144 | ​ | $ | 542,297 | ​ | $ | 1,021 | ​ | $ | 105,125 | ​

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