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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Investment Securities |
Schedule of cost basis and fair values of investment securities | The cost basis and fair values of investment securities are summarized as follows: Investment securities available for sale (AFS): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 6,725 | ​ | $ | 161 | ​ | $ | — | ​ | $ | 6,886
U.S. Agency mortgage-backed securities | ​ |  | 83,598 | ​ |  | 1,806 | ​ |  | (580) | ​ |  | 84,824
Municipal | ​ |  | 19,358 | ​ |  | 1,106 | ​ |  | (12) | ​ |  | 20,452
Corporate bonds | ​ |  | 52,538 | ​ |  | 1,206 | ​ |  | (63) | ​ |  | 53,681
Total | ​ | $ | 162,219 | ​ | $ | 4,279 | ​ | $ | (655) | ​ | $ | 165,843
​ Investment securities held to maturity (HTM): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 2,500 | ​ | $ | 4 | ​ | $ | — | ​ | $ | 2,504
U.S. Agency mortgage-backed securities | ​ | ​ | 11,612 | ​ | ​ | 292 | ​ | ​ | (58) | ​ | ​ | 11,846
Municipal | ​ |  | 31,931 | ​ |  | 2,101 | ​ |  | (86) | ​ |  | 33,946
Corporate bonds and other securities | ​ |  | 7,509 | ​ |  | 88 | ​ |  | (2) | ​ |  | 7,595
Total | ​ | $ | 53,552 | ​ | $ | 2,485 | ​ | $ | (146) | ​ | $ | 55,891
​ Investment securities available for sale (AFS): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 2,971 | ​ | $ | 181 | ​ | $ | — | ​ | $ | 3,152
U.S. Agency mortgage-backed securities | ​ |  | 65,398 | ​ |  | 2,533 | ​ |  | (18) | ​ |  | 67,913
Municipal | ​ |  | 19,000 | ​ |  | 1,348 | ​ |  | — | ​ |  | 20,348
Corporate bonds | ​ |  | 52,315 | ​ |  | 666 | ​ |  | (229) | ​ |  | 52,752
Total | ​ | $ | 139,684 | ​ | $ | 4,728 | ​ | $ | (247) | ​ | $ | 144,165
​ Investment securities held to maturity (HTM): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ | ​ | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency mortgage-backed securities |  | $ | 8,119 | ​ | $ | 369 | ​ | $ | — | ​ | $ | 8,488
Municipal | ​ |  | 30,076 | ​ |  | 2,455 | ​ |  | (49) | ​ |  | 32,482
Corporate bonds and other securities | ​ |  | 6,027 | ​ |  | 113 | ​ |  | (4) | ​ |  | 6,136
Total | ​ | $ | 44,222 | ​ | $ | 2,937 | ​ | $ | (53) | ​ | $ | 47,106
Schedule of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | Available for sale | ​ | Held to maturity
​ |  | Cost Basis |  | Fair Value |  | Cost Basis |  | Fair Value
Within 1 year | ​ | $ | 3,575 | ​ | $ | 3,627 | ​ | $ | 3,000 | ​ | $ | 2,999
After 1 year but within 5 years | ​ |  | 32,800 | ​ |  | 33,881 | ​ |  | 8,155 | ​ |  | 8,553
After 5 years but within 10 years | ​ |  | 46,739 | ​ |  | 48,276 | ​ |  | 23,536 | ​ |  | 25,083
After 10 years but within15 years | ​ |  | 13,090 | ​ |  | 13,639 | ​ |  | 9,441 | ​ |  | 9,761
Over 15 years | ​ |  | 66,015 | ​ |  | 66,420 | ​ |  | 9,420 | ​ |  | 9,495
Total | ​ | $ | 162,219 | ​ | $ | 165,843 | ​ | $ | 53,552 | ​ | $ | 55,891
Schedule of investments with unrealized losses | The following tables present information concerning investments with unrealized losses as of June 30, 2021 and December 31, 2020 (in thousands): Total investment securities:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | LESS THAN 12 MONTHS | ​ | 12 MONTHS OR LONGER | ​ | TOTAL
​ | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED
​ |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES
U.S. Agency mortgage-backed securities | ​ | $ | 28,931 | ​ | $ | (637) | ​ | $ | 93 | ​ | $ | (1) | ​ | $ | 29,024 | ​ | $ | (638)
Municipal | ​ |  | 4,542 | ​ | ​ | (54) | ​ | ​ | 752 | ​ | ​ | (44) | ​ | ​ | 5,294 | ​ | ​ | (98)
Corporate bonds and other securities | ​ |  | 5,843 | ​ | ​ | (57) | ​ | ​ | 3,993 | ​ | ​ | (8) | ​ | ​ | 9,836 | ​ | ​ | (65)
Total | ​ | $ | 39,316 | ​ | $ | (748) | ​ | $ | 4,838 | ​ | $ | (53) | ​ | $ | 44,154 | ​ | $ | (801)
​ ​ Total investment securities:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | LESS THAN 12 MONTHS | ​ | 12 MONTHS OR LONGER | ​ | TOTAL
​ | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED
​ |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES
U.S. Agency mortgage-backed securities | ​ | $ | 6,394 | ​ | $ | (17) | ​ | $ | 123 | ​ | $ | (1) | ​ | $ | 6,517 | ​ | $ | (18)
Municipal | ​ |  | — | ​ | ​ | — | ​ | ​ | 751 | ​ | ​ | (49) | ​ | ​ | 751 | ​ | ​ | (49)
Corporate bonds and other securities | ​ |  | 13,083 | ​ | ​ | (162) | ​ | ​ | 7,929 | ​ | ​ | (71) | ​ | ​ | 21,012 | ​ | ​ | (233)
Total | ​ | $ | 19,477 | ​ | $ | (179) | ​ | $ | 8,803 | ​ | $ | (121) | ​ | $ | 28,280 | ​ | $ | (300)

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- 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
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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=121645371&loc=d3e27290-111563 + Details
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