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Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Securities |
Schedule of amortized cost and estimated fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Allowance | ​ | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | for Credit | ​ | Fair
June 30, 2020 |  | Cost |  | Gains |  | (Losses) | ​ | Losses |  | Value
​ | ​ | (Dollars in thousands)
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 225,429 | ​ | $ | 6,906 | ​ | $ | — | ​ | $ | — | ​ | $ | 232,335
U.S. Treasury | ​ | ​ | 89,476 | ​ | ​ | 1,754 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 91,230
Total | ​ | $ | 314,905 | ​ | $ | 8,660 | ​ | $ | — | ​ | $ | — | ​ | $ | 323,565
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated | ​ | Allowance
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair | ​ | for Credit
June 30, 2020 |  | Cost |  | Gains |  | (Losses) | ​ | Value |  | Losses
​ | ​ | (Dollars in thousands)
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 249,070 | ​ | $ | 7,895 | ​ | $ | (1) | ​ | $ | 256,964 | ​ | $ | —
Municipals - exempt from Federal tax | ​ | ​ | 73,662 | ​ | ​ | 1,826 | ​ | ​ | — | ​ | ​ | 75,488 | ​ | ​ | (55)
Total | ​ | $ | 322,732 | ​ | $ | 9,721 | ​ | $ | (1) | ​ | $ | 332,452 | ​ | $ | (55)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2019 |  | Cost |  | Gains |  | (Losses) | ​ | Value
​ | ​ | (Dollars in thousands)
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 283,598 | ​ | $ | 934 | ​ | $ | (171) | ​ | $ | 284,361
U.S. Treasury | ​ | ​ | 118,939 | ​ | ​ | 1,525 | ​ | ​ | — | ​ | ​ | 120,464
Total | ​ | $ | 402,537 | ​ | $ | 2,459 | ​ | $ | (171) | ​ | $ | 404,825
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
December 31, 2019 |  | Cost |  | Gains |  | (Losses) | ​ | Value
​ | ​ | (Dollars in thousands)
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 285,344 | ​ | $ | 1,206 | ​ | $ | (968) | ​ | $ | 285,582
Municipals - exempt from Federal tax | ​ | ​ | 81,216 | ​ | ​ | 1,313 | ​ | ​ | (4) | ​ | ​ | 82,525
Total | ​ | $ | 366,560 | ​ | $ | 2,519 | ​ | $ | (972) | ​ | $ | 368,107
​
Schedule of securities with unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
June 30, 2020 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses)
​ | ​ | (Dollars in thousands)
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 512 | ​ | $ | (1) | ​ | $ | — | ​ | $ | — | ​ | $ | 512 | ​ | $ | (1)
Total | ​ | $ | 512 | ​ | $ | (1) | ​ | $ | — | ​ | $ | — | ​ | $ | 512 | ​ | $ | (1)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
December 31, 2019 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses)
​ | ​ | (Dollars in thousands)
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 100,816 | ​ | $ | (105) | ​ | $ | 27,534 | ​ | $ | (66) | ​ | $ | 128,350 | ​ | $ | (171)
Total | ​ | $ | 100,816 | ​ | $ | (105) | ​ | $ | 27,534 | ​ | $ | (66) | ​ | $ | 128,350 | ​ | $ | (171)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 50,060 | ​ | $ | (178) | ​ | $ | 88,128 | ​ | $ | (790) | ​ | $ | 138,188 | ​ | $ | (968)
Municipals - exempt from Federal tax | ​ | ​ | 1,556 | ​ | ​ | (4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,556 | ​ | ​ | (4)
Total | ​ | $ | 51,616 | ​ | $ | (182) | ​ | $ | 88,128 | ​ | $ | (790) | ​ | $ | 139,744 | ​ | $ | (972)
​
Schedule of proceeds from sales of securities and the resulting gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (Dollars in thousands) | ​
Proceeds | ​ | $ | 30,085 | ​ | $ | 59,878 | ​ | $ | 56,598 | ​ | $ | 59,878 | ​
Gross gains | ​ |  | 170 | ​ |  | 608 | ​ |  | 270 | ​ |  | 608 | ​
Gross losses | ​ |  | — | ​ |  | (60) | ​ |  | — | ​ |  | (60) | ​
Schedule of amortized cost and estimated fair values of securities, by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available-for-sale |
​ |  | Amortized |  | Estimated |
​ | ​ | Cost | ​ | Fair Value |
​ | ​ | (Dollars in thousands) |
Due after 3 months through one year | ​ | $ | 74,608 | ​ | ​ | 75,861 | ​
Due after one through five years | ​ | ​ | 14,868 | ​ | ​ | 15,369 | ​
Agency mortgage-backed securities | ​ | ​ | 225,429 | ​ | ​ | 232,335 | ​
Total | ​ | $ | 314,905 | ​ | $ | 323,565 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held-to-maturity |
​ |  | Amortized |  | Estimated |
​ | ​ | Cost | ​ | Fair Value |
​ | ​ | (Dollars in thousands) |
Due 3 months or less | ​ | $ | 530 | ​ | $ | 531 | ​
Due after 3 months through one year | ​ | ​ | 914 | ​ | ​ | 917 | ​
Due after one through five years | ​ | ​ | 7,283 | ​ | ​ | 7,537 | ​
Due after five through ten years | ​ | ​ | 33,354 | ​ | ​ | 34,201 | ​
Due after ten years | ​ |  | 31,581 | ​ | ​ | 32,302 | ​
Agency mortgage-backed securities | ​ |  | 249,070 | ​ |  | 256,964 | ​
Total | ​ | $ | 322,732 | ​ | $ | 332,452 | ​
Schedule of rollforward by major security type of the allowance for credit losses on debt securities held-to-maturity | ​
​ | ​ | ​
​ | ​ | Municipals
​ | ​ | (Dollars in thousands)
Beginning balance January 1, 2020 | $ | -
Impact of adopting Topic 326 | ​ | 58
Provision (credit) for credit loss | ​ | (3)
Ending balance June 30, 2020 | $ | 55

X
- Definition Tabular disclosure of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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