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Securities
6 Months Ended
Jun. 30, 2023
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 June 30, 2023
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Available-for-sale:
U.S. treasuries$9,105 $$(508)8,598 
U.S. government agency securities - government-sponsored enterprises29,202 52 (625)28,629 
Municipal securities41,108 — (5,344)35,764 
Residential mortgage-backed securities - government issued33,845 — (2,837)31,008 
Residential mortgage-backed securities - government-sponsored enterprises132,823 11 (13,016)119,818 
Commercial mortgage-backed securities - government issued3,343 — (535)2,808 
Commercial mortgage-backed securities - government-sponsored enterprises32,134 — (5,133)27,001 
 $281,560 $64 $(27,998)$253,626 
 As of December 31, 2022
Amortized CostGross
Unrealized Gains
Gross
Unrealized Losses
Fair Value
 (In Thousands)
Available-for-sale:
U.S. treasuries$4,977 $— $(532)$4,445 
U.S. government agency securities - government-sponsored enterprises
13,666 70 (531)13,205 
Municipal securities45,088 90 (5,867)39,311 
Residential mortgage-backed securities - government issued21,790 — (2,359)19,431 
Residential mortgage-backed securities - government-sponsored enterprises
119,265 — (12,942)106,323 
Commercial mortgage-backed securities - government issued3,450 — (518)2,932 
Commercial mortgage-backed securities - government-sponsored enterprises31,515 — (5,138)26,377 
 $239,751 $160 $(27,887)$212,024 
The amortized cost and fair value of securities held-to-maturity and the corresponding amounts of gross unrecognized gains and losses were as follows:
 As of June 30, 2023
Amortized CostGross
Unrecognized Gains
Gross
Unrecognized Losses
Fair Value
 (In Thousands)
Held-to-maturity:
Municipal securities$5,168 $— $(72)$5,096 
Residential mortgage-backed securities - government issued1,415 — (101)1,314 
Residential mortgage-backed securities - government-sponsored enterprises
1,242 — (78)1,164 
Commercial mortgage-backed securities - government-sponsored enterprises2,005 — (110)1,895 
 $9,830 $— $(361)$9,469 
 As of December 31, 2022
Amortized CostGross
Unrecognized Gains
Gross
Unrecognized Losses
Fair Value
 (In Thousands)
Held-to-maturity:
Municipal securities$7,467 $$(70)$7,404 
Residential mortgage-backed securities - government issued1,625 — (107)1,518 
Residential mortgage-backed securities - government-sponsored enterprises
1,537 — (93)1,444 
Commercial mortgage-backed securities - government-sponsored enterprises
2,006 — (102)1,904 
 $12,635 $$(372)$12,270 

U.S. Treasuries contain treasury bonds issued by the United States Treasury. 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. The Corporation sold 16 available-for-sale securities during the three and six months ended June 30, 2023 and none during the three and six months ended June 30, 2022.

At June 30, 2023 and December 31, 2022, securities with a fair value of $46.0 million and $35.9 million, respectively, were pledged to secure various obligations, including interest rate swap contracts and municipal deposits.
The amortized cost and fair value of securities by contractual maturity at June 30, 2023 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$16,023 $15,968 $1,760 $1,747 
Due in one year through five years17,490 16,197 3,006 2,952 
Due in five through ten years14,973 13,662 402 397 
Due in over ten years30,929 27,164 — — 
79,415 72,991 5,168 5,096 
Residential mortgage-backed securities166,668 150,826 2,657 2,478 
Commercial mortgage-backed securities35,477 29,809 2,005 1,895 
 $281,560 $253,626 $9,830 $9,469 

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 June 30, 2023 and December 31, 2022. At June 30, 2023, the Corporation held 180 available-for-sale securities that were in an unrealized loss position. At June 30, 2023, the Corporation held 144 available-for-sale securities that have 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 assess declines in fair value for credit losses. Consideration is given to such factors as the credit rating of the borrower, market conditions such as current interest rates, any adverse conditions specific to the security, and delinquency status on contractual payments. For the three and six months ended June 30, 2023 and 2022, management concluded that in all instances securities with fair value less than carrying value was due to market and other factors; thus, no credit loss provision was required.
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 June 30, 2023
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Available-for-sale:
U.S. treasuries$— $— $4,472 $508 $4,472 $508 
U.S. government agency securities - government-sponsored enterprises
16,287 115 2,990 510 19,277 625 
Municipal securities
999 23 34,765 5,321 35,764 5,344 
Residential mortgage-backed securities - government issued
19,960 699 11,048 2,138 31,008 2,837 
Residential mortgage-backed securities - government-sponsored enterprises
43,820 1,290 74,153 11,726 117,973 13,016 
Commercial mortgage-backed securities - government issued
— — 2,808 535 2,808 535 
Commercial mortgage-backed securities - government-sponsored enterprises
886 32 26,115 5,101 27,001 5,133 
 $81,952 $2,159 $156,351 $25,839 $238,303 $27,998 
 As of December 31, 2022
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
 (In Thousands)
Available-for-sale:
U.S. treasuries$— $— $4,446 $532 $4,446 $532 
U.S. government agency securities - government-sponsored enterprises
— — 2,969 531 2,969 531 
Municipal securities
26,759 3,132 10,133 2,735 36,892 5,867 
Residential mortgage-backed securities - government issued
9,624 436 9,807 1,923 19,431 2,359 
Residential mortgage-backed securities - government-sponsored enterprises
71,474 6,433 34,849 6,509 106,323 12,942 
Commercial mortgage-backed securities - government issued
1,236 112 1,696 406 2,932 518 
Commercial mortgage-backed securities - government-sponsored enterprises
7,758 984 18,619 4,154 26,377 5,138 
 $116,851 $11,097 $82,519 $16,790 $199,370 $27,887 

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 June 30, 2023 and December 31, 2022. At June 30, 2023, the Corporation held 34 held-to-maturity securities that were in an unrealized loss position. At June 30, 2023, the Corporation held 15 held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or greater. Management assesses held-to-maturity securities for credit losses on a quarterly basis.
The assessment includes review of credit ratings, identification of delinquency and evaluation of market factors. Based on this analysis, management concludes the decline in fair value is due to market factors, specifically changes in interest rates. Accordingly, no credit loss provision was recorded in the unaudited Consolidated Statements of Income for the three and six months ended June 30, 2023 and 2022.

A summary of unrecognized 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 June 30, 2023
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrecognized
Losses
Fair ValueUnrecognized
Losses
Fair ValueUnrecognized
Losses
 (In Thousands)
Held-to-maturity:
Municipal securities
$4,764 $54 $332 $18 $5,096 $72 
Residential mortgage-backed securities - government issued
— — 1,314 101 1,314 101 
Residential mortgage-backed securities - government-sponsored enterprises
221 19 943 59 1,164 78 
Commercial mortgage-backed securities - government-sponsored enterprises1,895 110 — — 1,895 110 
 $6,880 $183 $2,589 $178 $9,469 $361 
 As of December 31, 2022
 Less than 12 Months12 Months or LongerTotal
Fair ValueUnrecognized
Losses
Fair ValueUnrecognized
Losses
Fair ValueUnrecognized
Losses
 (In Thousands)
Held-to-maturity:
Municipal securities
$6,035 $52 $267 $18 $6,302 $70 
Residential mortgage-backed securities - government issued
1,518 107 — — 1,518 107 
Residential mortgage-backed securities - government-sponsored enterprises
1,444 93 — — 1,444 93 
Commercial mortgage-backed securities - government-sponsored enterprises1,904 102 — — 1,904 102 
 $10,901 $354 $267 $18 $11,168 $372 
On January 1, 2023, the Corporation adopted ASU 2016-13, which replaced the legacy GAAP other-than-temporary impairment (“OTTI”) model with a credit loss model. ASU 2016-13 requires an allowance on lifetime expected credit losses on held to maturity debt securities. As of January 1, 2023 and June 30, 2023, the Corporation estimated the expected credit losses to be immaterial based on the composition of the securities portfolio.