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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Investment Securities |
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, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 4,882 | ​ | $ | 39 | ​ | $ | — | ​ | $ | 4,921 | ​
State and municipal obligations | ​ |  | 215,388 | ​ |  | 6,631 | ​ |  | (415) | ​ |  | 221,604 | ​
Mortgage-backed securities** | ​ |  | 1,695,191 | ​ |  | 51,971 | ​ |  | (2,492) | ​ |  | 1,744,670 | ​
​ | ​ | $ | 1,915,461 | ​ | $ | 58,641 | ​ | $ | (2,907) | ​ | $ | 1,971,195 | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 25,356 | ​ | $ | 585 | ​ | $ | — | ​ | $ | 25,941 | ​
State and municipal obligations | ​ |  | 204,150 | ​ |  | 5,029 | ​ |  | (764) | ​ |  | 208,415 | ​
Mortgage-backed securities** | ​ |  | 1,711,257 | ​ |  | 14,209 | ​ |  | (3,775) | ​ |  | 1,721,691 | ​
​ | ​ | $ | 1,940,763 | ​ | $ | 19,823 | ​ | $ | (4,539) | ​ | $ | 1,956,047 | ​
March 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 65,567 | ​ | $ | 441 | ​ | $ | (304) | ​ | $ | 65,704 | ​
State and municipal obligations | ​ |  | 190,302 | ​ |  | 3,170 | ​ |  | (54) | ​ |  | 193,418 | ​
Mortgage-backed securities** | ​ |  | 1,216,669 | ​ |  | 1,991 | ​ |  | (11,533) | ​ |  | 1,207,127 | ​
​ | ​ | $ | 1,472,538 | ​ | $ | 5,602 | ​ | $ | (11,891) | ​ | $ | 1,466,249 | ​
* - Our government-sponsored entities holdings are comprised of debt securities offered by FHLMC, FNMA, FHLB, GNMA and FFCB. ** - All of the mortgage-backed securities are issued by government-sponsored entities; there are no private-label holdings. Also, included in our mortgage-backed securities are debt securities offered by the SBA, which have the full faith and credit backing of the United States Government.
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
March 31, 2020: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 56,914 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 2,517 | ​
​ | ​ | $ | 62,994 | ​
December 31, 2019: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 43,044 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 2,517 | ​
​ | ​ | $ | 49,124 | ​
March 31, 2019: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 34,544 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 2,517 | ​
​ | ​ | $ | 40,624 | ​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities |
​ | ​ | Available for Sale |
​ | ​ | Amortized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Value |
Due in one year or less |  | $ | 12,015 |  | $ | 12,051 | ​
Due after one year through five years | ​ |  | 36,369 | ​ |  | 37,250 | ​
Due after five years through ten years | ​ |  | 415,577 | ​ |  | 427,830 | ​
Due after ten years | ​ |  | 1,451,500 | ​ |  | 1,494,064 | ​
​ | ​ | $ | 1,915,461 | ​ | $ | 1,971,195 | ​
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 |
March 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
State and municipal obligations | ​ |  | 415 | ​ |  | 15,646 | ​ |  | — | ​ |  | — | ​
Mortgage-backed securities | ​ |  | 1,888 | ​ |  | 231,144 | ​ |  | 604 | ​ |  | 52,993 | ​
​ | ​ | $ | 2,303 | ​ | $ | 246,790 | ​ | $ | 604 | ​ | $ | 52,993 | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
State and municipal obligations | ​ |  | 764 | ​ |  | 42,070 | ​ |  | — | ​ |  | — | ​
Mortgage-backed securities | ​ |  | 2,422 | ​ |  | 461,658 | ​ |  | 1,353 | ​ |  | 141,982 | ​
​ | ​ | $ | 3,186 | ​ | $ | 503,728 | ​ | $ | 1,353 | ​ | $ | 141,982 | ​
March 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt | ​ | $ | 49 | ​ | $ | 11,687 | ​ | $ | 255 | ​ | $ | 30,490 | ​
State and municipal obligations | ​ |  | — | ​ |  | — | ​ |  | 54 | ​ |  | 10,310 | ​
Mortgage-backed securities | ​ |  | 726 | ​ |  | 110,389 | ​ |  | 10,807 | ​ |  | 826,714 | ​
​ | ​ | $ | 775 | ​ | $ | 122,076 | ​ | $ | 11,116 | ​ | $ | 867,514 | ​

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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