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Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
The following table presents the fair values of our securities portfolio at the dates presented:
(dollars in thousands)September 30, 2024December 31, 2023
Debt securities$1,006,857 $969,308 
Equity securities4,455 1,083 
Total Securities Available for Sale$1,011,312 $970,391 
Schedule of Amortized Cost and Fair Value of Debt Securities
The following table presents the amortized cost and fair value of available-for-sale debt securities as of the dates presented:
 September 30, 2024December 31, 2023
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$122,960 $49 $(4,900)$118,109 $144,292 $— $(10,506)$133,786 
Obligations of U.S. government corporations and agencies15,282 — (256)15,026 33,342 — (829)32,513 
Collateralized mortgage obligations of U.S. government corporations and agencies598,762 3,907 (37,357)565,312 507,942 1,068 (48,071)460,939 
Residential mortgage-backed securities of U.S. government corporations and agencies41,069 6 (5,422)35,653 44,707 7 (6,537)38,177 
Commercial mortgage-backed securities of U.S. government corporations and agencies256,147 1,695 (9,798)248,044 290,775 458 (17,808)273,425 
Obligations of states and political subdivisions24,899 15 (201)24,713 30,255 213 — 30,468 
Total Available-for-Sale Debt Securities(1)
$1,059,119 $5,672 $(57,934)$1,006,857 $1,051,313 $1,746 $(83,751)$969,308 
(1) Excludes interest receivable of $3.6 million at September 30, 2024 and $3.8 million at December 31, 2023. Interest receivable is included in other assets in the Consolidated Balance Sheets.
Schedule of Fair Value and Age of Gross Unrealized Losses of Debt Securities
The following tables present the fair value and the age of gross unrealized losses on available-for-sale debt securities by investment category as of the dates presented:
September 30, 2024
Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses
U.S. Treasury securities2$20,311 $(60)8$77,622 $(4,840)10$97,933 $(4,900)
Obligations of U.S. government corporations and agencies—— — 215,026 (256)215,026 (256)
Collateralized mortgage obligations of U.S. government corporations and agencies329,281 (238)56339,367 (37,119)59368,648 (37,357)
Residential mortgage-backed securities of U.S. government corporations and agencies840 — 1335,429 (5,422)2135,469 (5,422)
Commercial mortgage-backed securities of U.S. government corporations and agencies219,448 (153)18162,908 (9,645)20182,356 (9,798)
Obligations of states and political subdivisions219,666 (201)—— — 219,666 (201)
Total17$88,746 $(652)97$630,352 $(57,282)114$719,098 $(57,934)
December 31, 2023
Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses
U.S. Treasury securities1$10,036 $(52)13$123,750 $(10,454)14$133,786 $(10,506)
Obligations of U.S. government corporations and agencies—— — 532,513 (829)532,513 (829)
Collateralized mortgage obligations of U.S. government corporations and agencies435,161 (318)57351,220 (47,753)61386,381 (48,071)
Residential mortgage-backed securities of U.S. government corporations and agencies10100 (1)1437,877 (6,536)2437,977 (6,537)
Commercial mortgage-backed securities of U.S. government corporations and agencies—— — 29249,005 (17,808)29249,005 (17,808)
Total15$45,297 $(371)118$794,365 $(83,380)133$839,662 $(83,751)
Schedule of Unrealized Gains (Losses) of Debt Securities
The following table presents net unrealized gains and losses, net of tax, on available-for-sale debt securities included in accumulated other comprehensive income (loss), for the periods presented:
September 30, 2024December 31, 2023
(dollars in thousands)Gross Unrealized GainsGross Unrealized LossesNet Unrealized LossesGross Unrealized GainsGross Unrealized LossesNet Unrealized Losses
Total unrealized gains (losses) on available-for-sale debt securities$5,672 $(57,934)$(52,262)$1,746 $(83,751)$(82,005)
Income tax (expense) benefit(1,221)12,462 11,241 (372)17,824 17,452 
Net Unrealized Gains (Losses), Net of Tax Included in Accumulated Other Comprehensive Income (Loss)$4,451 $(45,472)$(41,021)$1,374 $(65,927)$(64,553)
Schedule of Contractual Maturities of Debt Securities
The amortized cost and fair value of available-for-sale debt securities at September 30, 2024 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
September 30, 2024
(dollars in thousands)Amortized
Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies and obligations of states and political subdivisions
Due in one year or less$15,282 $15,026 
Due after one year through five years127,993 123,156 
Due after five years through ten years19,866 19,666 
Due after ten years— — 
Available-for-Sale Debt Securities With Fixed Maturities163,141 157,848 
Debt Securities without a single maturity date
Collateralized mortgage obligations of U.S. government corporations and agencies598,762 565,312 
Residential mortgage-backed securities of U.S. government corporations and agencies41,069 35,653 
Commercial mortgage-backed securities of U.S. government corporations and agencies256,147 248,044 
Total Available-for-Sale Debt Securities$1,059,119 $1,006,857