XML 34 R24.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Investments Securities (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Investments [Abstract] |
Unrealized Gain (Loss) on Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | 7,000 | ​ | $ | — | ​ | $ | 981 | ​ | $ | — | ​ | $ | 6,019
Residential mortgage-backed agencies | ​ | ​ | 24,261 | ​ | ​ | — | ​ | ​ | 4,407 | ​ | ​ | — | ​ | ​ | 19,854
Commercial mortgage-backed agencies | ​ | ​ | 36,082 | ​ | ​ | — | ​ | ​ | 8,166 | ​ | ​ | — | ​ | ​ | 27,916
Collateralized mortgage obligations | ​ | ​ | 19,320 | ​ | ​ | — | ​ | ​ | 3,431 | ​ | ​ | — | ​ | ​ | 15,889
Obligations of states and political subdivisions | ​ | ​ | 10,481 | ​ | ​ | 14 | ​ | ​ | 242 | ​ | ​ | — | ​ | ​ | 10,253
Corporate bonds | ​ | ​ | 1,000 | ​ | ​ | — | ​ | ​ | 237 | ​ | ​ | — | ​ | ​ | 763
Collateralized debt obligations | ​ | ​ | 18,651 | ​ | ​ | — | ​ | ​ | 3,765 | ​ | ​ | — | ​ | ​ | 14,886
Total available for sale | ​ | $ | 116,795 | ​ | $ | 14 | ​ | $ | 21,229 | ​ | $ | — | ​ | $ | 95,580
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrecognized Gains |  | Gross Unrecognized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses
March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 7,498 | ​ | $ | — | ​ | $ | 14 | ​ | $ | 7,484 | ​ | $ | —
U.S. government agencies | ​ | ​ | 68,085 | ​ | ​ | — | ​ | ​ | 11,443 | ​ | ​ | 56,642 | ​ | ​ | —
Residential mortgage-backed agencies | ​ | ​ | 29,258 | ​ | ​ | 14 | ​ | ​ | 3,389 | ​ | ​ | 25,883 | ​ | ​ | —
Commercial mortgage-backed agencies | ​ | ​ | 21,371 | ​ | ​ | — | ​ | ​ | 5,583 | ​ | ​ | 15,788 | ​ | ​ | —
Collateralized mortgage obligations | ​ | ​ | 52,364 | ​ | ​ | — | ​ | ​ | 10,016 | ​ | ​ | 42,348 | ​ | ​ | —
Obligations of states and political subdivisions | ​ | ​ | 4,605 | ​ | ​ | 148 | ​ | ​ | 673 | ​ | ​ | 4,080 | ​ | ​ | 45
Total held to maturity | ​ | $ | 183,181 | ​ | $ | 162 | ​ | $ | 31,118 | ​ | $ | 152,225 | ​ | $ | 45
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | 7,000 | ​ | $ | — | ​ | $ | 966 | ​ | $ | — | ​ | $ | 6,034
Residential mortgage-backed agencies | ​ | ​ | 24,781 | ​ | ​ | — | ​ | ​ | 4,218 | ​ | ​ | — | ​ | ​ | 20,563
Commercial mortgage-backed agencies | ​ | ​ | 36,258 | ​ | ​ | — | ​ | ​ | 7,841 | ​ | ​ | — | ​ | ​ | 28,417
Collateralized mortgage obligations | ​ | ​ | 19,725 | ​ | ​ | — | ​ | ​ | 3,369 | ​ | ​ | — | ​ | ​ | 16,356
Obligations of states and political subdivisions | ​ | ​ | 10,486 | ​ | ​ | 15 | ​ | ​ | 189 | ​ | ​ | — | ​ | ​ | 10,312
Corporate bonds | ​ | ​ | 1,000 | ​ | ​ | — | ​ | ​ | 222 | ​ | ​ | — | ​ | ​ | 778
Collateralized debt obligations | ​ | ​ | 18,671 | ​ | ​ | — | ​ | ​ | 3,962 | ​ | ​ | — | ​ | ​ | 14,709
Total available for sale | ​ | $ | 117,921 | ​ | $ | 15 | ​ | $ | 20,767 | ​ | $ | — | ​ | $ | 97,169
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrecognized Gains |  | Gross Unrecognized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 37,462 | ​ | $ | — | ​ | $ | 243 | ​ | $ | 37,219 | ​ | $ | —
U.S. government agencies | ​ | ​ | 68,014 | ​ | ​ | — | ​ | ​ | 10,985 | ​ | ​ | 57,029 | ​ | ​ | —
Residential mortgage-backed agencies | ​ | ​ | 29,588 | ​ | ​ | 42 | ​ | ​ | 2,913 | ​ | ​ | 26,717 | ​ | ​ | —
Commercial mortgage-backed agencies | ​ | ​ | 21,413 | ​ | ​ | — | ​ | ​ | 5,361 | ​ | ​ | 16,052 | ​ | ​ | —
Collateralized mortgage obligations | ​ | ​ | 53,261 | ​ | ​ | — | ​ | ​ | 9,973 | ​ | ​ | 43,288 | ​ | ​ | —
Obligations of states and political subdivisions | ​ | ​ | 4,604 | ​ | ​ | 177 | ​ | ​ | 671 | ​ | ​ | 4,110 | ​ | ​ | 45
Total held to maturity | ​ | $ | 214,342 | ​ | $ | 219 | ​ | $ | 30,146 | ​ | $ | 184,415 | ​ | $ | 45
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross Unrealized Losses and Fair Values of Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrealized Losses |  | Number of Investments |  | Fair Value |  | Unrealized Losses |  | Number of Investments
March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | — | ​ | ​ | — | ​ | — | ​ | ​ | 6,019 | ​ | ​ | 981 | ​ | 2
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 19,854 | ​ | ​ | 4,407 | ​ | 3
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 27,916 | ​ | ​ | 8,166 | ​ | 8
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 15,889 | ​ | ​ | 3,431 | ​ | 9
Obligations of states and political subdivisions | ​ | ​ | 882 | ​ | ​ | 13 | ​ | 2 | ​ | ​ | 7,118 | ​ | ​ | 229 | ​ | 4
Corporate Bonds | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 763 | ​ | ​ | 237 | ​ | 1
Collateralized debt obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 14,886 | ​ | ​ | 3,765 | ​ | 9
Total available for sale | ​ | $ | 882 | ​ | $ | 13 | ​ | 2 | ​ | $ | 92,445 | ​ | $ | 21,216 | ​ | 36
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrecognized Losses |  | Number of Investments |  | Fair Value |  | Unrecognized Losses |  | Number of Investments
March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | — | ​ | ​ | — | ​ | — | ​ | ​ | 7,484 | ​ | ​ | 14 | ​ | 1
U.S. government agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 56,642 | ​ | ​ | 11,443 | ​ | 9
Residential mortgage-backed agencies | ​ | ​ | 1,420 | ​ | ​ | 6 | ​ | 1 | ​ | ​ | 21,829 | ​ | ​ | 3,383 | ​ | 35
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 15,788 | ​ | ​ | 5,583 | ​ | 2
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 42,348 | ​ | ​ | 10,016 | ​ | 8
Obligations of states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 2,204 | ​ | ​ | 673 | ​ | 1
Total held to maturity | ​ | $ | 1,420 | ​ | $ | 6 | ​ | 1 | ​ | $ | 146,295 | ​ | $ | 31,112 | ​ | 56
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrealized Losses |  | Number of Investments |  | Fair Value |  | Unrealized Losses |  | Number of Investments
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 6,034 | ​ | $ | 966 | ​ | 2
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 20,563 | ​ | ​ | 4,218 | ​ | 3
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 28,417 | ​ | ​ | 7,841 | ​ | 8
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 16,356 | ​ | ​ | 3,369 | ​ | 9
Obligations of states and political subdivisions | ​ | ​ | 1,445 | ​ | ​ | 20 | ​ | 2 | ​ | ​ | 6,668 | ​ | ​ | 169 | ​ | 3
Corporate Bonds | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 778 | ​ | ​ | 222 | ​ | 1
Collateralized debt obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 14,709 | ​ | ​ | 3,962 | ​ | 9
Total available for sale | ​ | $ | 1,445 | ​ | $ | 20 | ​ | 2 | ​ | $ | 93,525 | ​ | $ | 20,747 | ​ | 35
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrecognized Losses |  | Number of Investments |  | Fair Value |  | Unrecognized Losses |  | Number of Investments
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 37,219 | ​ | $ | 243 | ​ | 4
U.S. government agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 57,029 | ​ | ​ | 10,985 | ​ | 9
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 22,613 | ​ | ​ | 2,913 | ​ | 35
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 16,052 | ​ | ​ | 5,361 | ​ | 2
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 43,288 | ​ | ​ | 9,973 | ​ | 8
Obligations of states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 2,205 | ​ | ​ | 671 | ​ | 1
Total held to maturity | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 178,406 | ​ | $ | 30,146 | ​ | 59
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​
Amortized Cost and Fair Values Classified by Contractual Maturity Date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
(in thousands) |  | Amortized Cost |  | Fair Value
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 2,670 | ​ | $ | 2,651
Due after one year through five years | ​ | ​ | 5,250 | ​ | ​ | 4,943
Due after five years through ten years | ​ | ​ | 4,678 | ​ | ​ | 4,410
Due after ten years | ​ | ​ | 24,534 | ​ | ​ | 19,917
​ | ​ | ​ | 37,132 | ​ | ​ | 31,921
Residential mortgage-backed agencies | ​ | ​ | 24,261 | ​ | ​ | 19,854
Commercial mortgage-backed agencies | ​ | ​ | 36,082 | ​ | ​ | 27,916
Collateralized mortgage obligations | ​ | ​ | 19,320 | ​ | ​ | 15,889
Total available for sale | ​ | $ | 116,795 | ​ | $ | 95,580
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 7,498 | ​ | $ | 7,485
Due after one year through five years | ​ | ​ | 12,500 | ​ | ​ | 11,759
Due after five years through ten years | ​ | ​ | 40,503 | ​ | ​ | 34,161
Due after ten years | ​ | ​ | 19,687 | ​ | ​ | 14,801
​ | ​ | ​ | 80,188 | ​ | ​ | 68,206
Residential mortgage-backed agencies | ​ | ​ | 29,258 | ​ | ​ | 25,883
Commercial mortgage-backed agencies | ​ | ​ | 21,371 | ​ | ​ | 15,788
Collateralized mortgage obligations | ​ | ​ | 52,364 | ​ | ​ | 42,348
Total held to maturity | ​ | $ | 183,181 | ​ | $ | 152,225
​

X
- Definition Schedule of unrealized gain loss on investments [Table Text Block]. + References No definition available. + Details
Name: | func_ScheduleOfUnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | func_
Data Type: | dtr-types: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: | dtr-types: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 unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration