XML 50 R37.htm IDEA: XBRL DOCUMENT
v3.20.4

Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Securities |
Schedule of amortized cost and estimated fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Allowance | ​ | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | for Credit | ​ | Fair
December 31, 2020 |  | Cost |  | Gains |  | (Losses) | ​ | Losses |  | Value
​ | ​ | (Dollars in thousands)
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 170,215 | ​ | $ | 5,111 | ​ | $ | — | ​ | $ | — | ​ | $ | 175,326
U.S. Treasury | ​ | ​ | 59,797 | ​ | ​ | 651 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 60,448
Total | ​ | $ | 230,012 | ​ | $ | 5,762 | ​ | $ | — | ​ | $ | — | ​ | $ | 235,774
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated | ​ | Allowance
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair | ​ | for Credit
December 31, 2020 |  | Cost |  | Gains |  | (Losses) | ​ | Value |  | Losses
​ | ​ | (Dollars in thousands)
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 228,652 | ​ | $ | 6,075 | ​ | $ | (230) | ​ | $ | 234,497 | ​ | $ | —
Municipals - exempt from Federal tax | ​ | ​ | 68,791 | ​ | ​ | 1,639 | ​ | ​ | — | ​ | ​ | 70,430 | ​ | ​ | (54)
Total | ​ | $ | 297,443 | ​ | $ | 7,714 | ​ | $ | (230) | ​ | $ | 304,927 | ​ | $ | (54)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | 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
December 31, 2020 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses)
​ | ​ | (Dollars in thousands)
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 30,930 | ​ | ​ | (230) | ​ | $ | — | ​ | $ | — | ​ | $ | 30,930 | ​ | $ | (230)
Total | ​ | $ | 30,930 | ​ | $ | (230) | ​ | $ | — | ​ | $ | — | ​ | $ | 30,930 | ​ | $ | (230)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 | ​
​ | ​ | (Dollars in thousands) |
Proceeds | ​ | $ | 56,598 | ​ | $ | 167,551 | ​ | $ | 94,291 | ​
Gross gains | ​ |  | 277 | ​ |  | 1,094 | ​ |  | 1,243 | ​
Gross losses | ​ |  | — | ​ |  | (433) | ​ |  | (977) | ​
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 3 months or less | ​ | $ | 14,988 | ​ | $ | 15,039 | ​
Due after 3 months through one year | ​ | ​ | 44,809 | ​ | ​ | 45,409 | ​
Agency mortgage-backed securities | ​ | ​ | 170,215 | ​ | ​ | 175,326 | ​
Total | ​ | $ | 230,012 | ​ | $ | 235,774 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held-to-maturity |
​ |  | Amortized |  | Estimated |
​ | ​ | Cost | ​ | Fair Value |
​ | ​ | (Dollars in thousands) |
Due after 3 months through one year | ​ | $ | 493 | ​ | $ | 499 | ​
Due after one through five years | ​ | ​ | 10,390 | ​ | ​ | 10,757 | ​
Due after five through ten years | ​ | ​ | 31,509 | ​ | ​ | 32,149 | ​
Due after ten years | ​ |  | 26,399 | ​ | ​ | 27,025 | ​
Agency mortgage-backed securities | ​ |  | 228,652 | ​ |  | 234,497 | ​
Total | ​ | $ | 297,443 | ​ | $ | 304,927 | ​
Schedule of roll-forward 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 | ​ | (4)
Ending balance December 31, 2020 | $ | 54

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
Name: | us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=121645371&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration