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Fair Value of Assets and Liabilities (Tables)
9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Summary of Assets Measured on a Recurring Basis
The following table provides the fair value for assets and liabilities required to be measured and reported at fair value on a recurring basis on the Unaudited Consolidated Balance Sheets by level in the fair value hierarchy.
 Recurring Fair Value Measurements at Reporting Date
September 30, 2024December 31, 2023
(Dollars in thousands)Level 1Level 2Level 1Level 2
Assets:  
Available-for-sale investment securities:
Obligations of:  
U.S. Treasury and government agencies
$27,961 $— $30,296 $— 
 U.S. government sponsored agencies— 174,708 — 118,607 
States and political subdivisions
— 206,779 — 213,296 
Residential mortgage-backed securities— 607,726 — 628,924 
Commercial mortgage-backed securities— 57,437 — 51,234 
Bank-issued trust preferred securities— 6,056 — 5,965 
Total available-for-sale securities$27,961 $1,052,706 $30,296 $1,018,026 
Equity investment securities (a)187 241 191 237 
Derivative assets (b)— 13,685 — 22,304 
Liabilities:
Derivative liabilities (c)$— $12,354 $— $19,122 
(a)    Included in "Other investment securities" on the Unaudited Consolidated Balance Sheets. For additional information, see "Note 3 Investment Securities" of the Notes to the Unaudited Condensed Consolidated Financial Statements.
(b)    Included in "Other assets" on the Unaudited Consolidated Balance Sheets. For additional information, see "Note 10 Derivative Financial Instruments" of the Notes to the Unaudited Condensed Consolidated Financial Statements.
(c)    Included in "Accrued expenses and other liabilities" on the Unaudited Consolidated Balance Sheets. For additional information, see "Note 10 Derivative Financial Instruments" of the Notes to the Unaudited Condensed Consolidated Financial Statements.
Summary of Assets and Liabilities Measured on a Non-Recurring Basis
The following table provides the fair value for each class of assets and liabilities required to be measured and reported at fair value on a non-recurring basis on the Unaudited Consolidated Balance Sheets by level in the fair value hierarchy at September 30, 2024 and December 31, 2023.
 Non-Recurring Fair Value Measurements at Reporting Date
September 30, 2024December 31, 2023
(Dollars in thousands)Level 2Level 3Level 2Level 3
Assets:
Collateral dependent loans$— $10,948 $— $501 
Loans held for sale (a)1,928 — 1,663 — 
Other real estate owned— — — 7,118 
(a) Loans held for sale are presented gross of a valuation allowance of $74 and $163 at September 30, 2024 and at December 31, 2023, respectively.
Summary of Financial Instruments Not Required to be Measured at Fair Value
The following table provides the carrying amount for each class of assets and liabilities and the fair value for certain financial instruments that are not required to be measured or reported at fair value on the Unaudited Consolidated Balance Sheets.
 Fair Value Measurements of Other Financial Instruments
(Dollars in thousands)Fair Value Hierarchy LevelSeptember 30, 2024December 31, 2023
Carrying AmountFair ValueCarrying AmountFair Value
Assets:
Cash and cash equivalents1$283,707 $283,707 $426,722 $426,722 
Held-to-maturity investment securities:
   Obligations of:
U.S. government sponsored agencies2196,642 191,610 188,475 180,825 
States and political subdivisions (a)2141,918 115,674 144,496 114,288 
Residential mortgage-backed securities2256,329 243,499 248,559 231,620 
Commercial mortgage-backed securities298,984 85,746 102,365 85,289 
        Total held-to-maturity securities693,873 636,529 683,895 612,022 
Other investment securities:
Other investment securities at cost:
Federal Home Loan Bank ("FHLB") stock N/A20,245 20,245 29,949 29,949 
Federal Reserve Bank ("FRB") stockN/A27,114 27,114 26,896 26,896 
Total other investment securities at cost47,359 47,359 56,845 56,845 
Other investment securities at fair value:
Nonqualified deferred compensation (b)14,729 4,729 3,162 3,162 
Other investment securities (c)23,175 3,175 2,985 2,985 
Total other investment securities 55,263 55,263 62,992 62,992 
Loans and leases, net of deferred fees and costs (d)36,271,839 6,229,349 6,159,196 6,064,999 
Bank owned life insurance 2143,065 143,065 140,554 140,554 
Liabilities:
Deposits2$7,483,157 $6,811,258 $7,152,297 $6,319,885 
Short-term borrowings2175,945 187,869 601,121 619,999 
Long-term borrowings2236,824 252,873 216,241 222,743 
(a) Obligations of states and political subdivisions are presented gross of an allowance for credit losses of $236 and $238 at September 30, 2024 and December 31, 2023, respectively.
(b) Investments in the nonqualified deferred compensation plan consist of mutual funds.
(c)     "Other investment securities", as reported on the Unaudited Consolidated Balance Sheets, also included equity investment securities at September 30, 2024
and at December 31, 2023, which are reported in the Assets and Liabilities Required to be Measured and Reported at Fair Value on a Recurring Basis
table above and not included in this table.
(d) Loans and leases, net of deferred fees and costs, are presented gross of an allowance for credit losses of $66.6 million and $62.0 million at September 30, 2024 and at December 31, 2023, respectively.