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Securities
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Securities Securities
The amortized cost and fair value of securities available-for-sale and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows:
 As of September 30, 2021
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Available-for-sale:
U.S. treasuries$4,970 $$— 4,971 
U.S. government agency securities - government-sponsored enterprises20,376 264 (75)20,565 
Municipal securities30,403 422 (328)30,497 
Residential mortgage-backed securities - government issued15,164 307 (58)15,413 
Residential mortgage-backed securities - government-sponsored enterprises87,940 1,188 (571)88,557 
Commercial mortgage-backed securities - government issued6,038 88 (46)6,080 
Commercial mortgage-backed securities - government-sponsored enterprises25,678 422 (369)25,731 
Other securities
2,205 37 — 2,242 
 $192,774 $2,729 $(1,447)$194,056 
 As of December 31, 2020
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Available-for-sale:
U.S. government agency securities - government-sponsored enterprises
$22,699 $$(79)$22,629 
Municipal securities24,067 716 (4)24,779 
Residential mortgage-backed securities - government issued9,894 509 — 10,403 
Residential mortgage-backed securities - government-sponsored enterprises
102,843 2,212 (49)105,006 
Commercial mortgage-backed securities - government issued5,289 175 — 5,464 
Commercial mortgage-backed securities - government-sponsored enterprises12,584 781 — 13,365 
Other securities
2,205 74 — 2,279 
 $179,581 $4,476 $(132)$183,925 
The amortized cost and fair value of securities held-to-maturity and the corresponding amounts of gross unrealized gains and losses were as follows:
 As of September 30, 2021
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Held-to-maturity:
Municipal securities$14,000 $261 $(11)$14,250 
Residential mortgage-backed securities - government issued2,507 67 — 2,574 
Residential mortgage-backed securities - government-sponsored enterprises
2,680 93 — 2,773 
Commercial mortgage-backed securities - government-sponsored enterprises2,009 219 — 2,228 
 $21,196 $640 $(11)$21,825 
 As of December 31, 2020
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Held-to-maturity:
Municipal securities$17,106 $417 $(15)$17,508 
Residential mortgage-backed securities - government issued3,564 112 — 3,676 
Residential mortgage-backed securities - government-sponsored enterprises
3,693 163 — 3,856 
Commercial mortgage-backed securities - government-sponsored enterprises
2,011 282 — 2,293 
 $26,374 $974 $(15)$27,333 

U.S. government agency securities - government-sponsored enterprises represent securities issued by Federal National Mortgage Association (“FNMA”) and the SBA. Municipal securities include securities issued by various municipalities located primarily within Wisconsin and are primarily general obligation bonds that are tax-exempt in nature. Residential and commercial mortgage-backed securities - government issued represent securities guaranteed by the Government National Mortgage Association. Residential and commercial mortgage-backed securities - government-sponsored enterprises include securities guaranteed by the Federal Home Loan Mortgage Corporation, FNMA, and the FHLB. Other securities represent certificates of deposit of insured banks and savings institutions with an original maturity greater than three months. There were no sales of available-for-sale securities that occurred during the three months ended September 30, 2021 and seven sales of available-for-sale securities that occurred during the nine months ended September 30, 2021. There were no sales of available-for-sale securities that occurred during three months ended September 30, 2020 and one sale that occurred during the nine months ended September 30, 2020.

At September 30, 2021 and December 31, 2020, securities with a fair value of $44.4 million and $73.7 million, respectively, were pledged to secure various obligations, including interest rate swap contracts.
The amortized cost and fair value of securities by contractual maturity at September 30, 2021 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations with or without call or prepayment penalties.
Available-for-SaleHeld-to-Maturity
 Amortized CostFair ValueAmortized CostFair Value
(In Thousands)
Due in one year or less$2,703 $2,740 $3,630 $3,647 
Due in one year through five years6,654 6,793 7,973 8,083 
Due in five through ten years49,213 49,790 8,022 8,452 
Due in over ten years134,204 134,733 1,571 1,643 
 $192,774 $194,056 $21,196 $21,825 

The tables below show the Corporation’s gross unrealized losses and fair value of available-for-sale investments aggregated by investment category and length of time that individual investments were in a continuous loss position at September 30, 2021 and December 31, 2020. At September 30, 2021, the Corporation held 42 available-for-sale securities that were in an unrealized loss position. Such securities have not experienced credit rating downgrades; however, they have primarily declined in value due to the current interest rate environment. At September 30, 2021, the Corporation held no available-for-sale securities that had been in a continuous unrealized loss position for twelve months or greater.

The Corporation also has not specifically identified available-for-sale securities in a loss position that it intends to sell in the near term and does not believe that it will be required to sell any such securities. The Corporation reviews its securities on a quarterly basis to monitor its exposure to other-than-temporary impairment. Consideration is given to such factors as the length of time and extent to which the security has been in an unrealized loss position, changes in security ratings, and an evaluation of the present value of expected future cash flows, if necessary. Based on the Corporation’s evaluation, it is expected that the Corporation will recover the entire amortized cost basis of each security. Accordingly, no other-than-temporary impairment was recorded in the unaudited Consolidated Statements of Income for the three and nine months ended September 30, 2021 and 2020.
A summary of unrealized loss information for securities available-for-sale, categorized by security type and length of time for which the security has been in a continuous unrealized loss position, follows:
 As of September 30, 2021
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Available-for-sale:
U.S. government agency securities - government-sponsored enterprises
$3,425 $75 $— $— $3,425 $75 
Municipal securities
13,384 328 — — 13,384 328 
Residential mortgage-backed securities - government issued
7,910 58 — — 7,910 58 
Residential mortgage-backed securities - government-sponsored enterprises
47,459 571 — — 47,459 571 
Commercial mortgage-backed securities - government issued
2,252 46 — — 2,252 46 
Commercial mortgage-backed securities - government-sponsored enterprises
14,932 369 — — 14,932 369 
 $89,362 $1,447 $— $— $89,362 $1,447 
 As of December 31, 2020
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Available-for-sale:
U.S. government agency securities - government-sponsored enterprises
$11,602 $45 $4,031 $34 $15,633 $79 
Municipal securities
2,863 — — 2,863 
Residential mortgage-backed securities - government-sponsored enterprises
19,078 49 — — 19,078 49 
 $33,543 $98 $4,031 $34 $37,574 $132 

The tables below show the Corporation’s gross unrealized losses and fair value of held-to-maturity investments, aggregated by investment category and length of time that individual investments were in a continuous loss position at September 30, 2021 and December 31, 2020. At September 30, 2021, the Corporation held three held-to-maturity securities that were in an unrealized loss position. Such securities have not experienced credit rating downgrades; however, they have primarily declined in value due to the current interest rate environment. At September 30, 2021, the Corporation held two held-to-maturity securities that had been in a continuous unrealized loss position for twelve months or greater. It is expected that the Corporation will recover the entire amortized cost basis of each held-to-maturity security based upon an evaluation of aforementioned factors. Accordingly, no other-than-temporary impairment was recorded in the unaudited Consolidated Statements of Income for the three and nine months ended September 30, 2021 and 2020.
A summary of unrealized loss information for securities held-to-maturity, categorized by security type and length of time for which the security has been in a continuous unrealized loss position, follows:
 As of September 30, 2021
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Held-to-maturity:
Municipal securities
$230 $$493 $10 $723 $11 
 As of December 31, 2020
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Held-to-maturity:
Municipal securities
$276 $13 $213 $$489 $15