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Securities (Tables)
 9 Months Ended
Sep. 30, 2021
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, 2021December 31, 2020
Available-for-sale debt securities$868,994 $770,393 
Marketable equity securities1,127 3,300 
Total Securities$870,121 $773,693 
Schedule of Amortized Cost and Fair Value of Debt Securities
The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented:
 September 30, 2021December 31, 2020
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value		Amortized
Cost		Gross Unrealized GainsGross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$85,222 $326 $(248)$85,300 $9,980 $302 $— $10,282 
Obligations of U.S. government corporations and agencies68,635 2,570 — 71,205 78,755 4,149 — 82,904 
Collateralized mortgage obligations of U.S. government corporations and agencies206,325 3,858 (1,198)208,985 202,975 6,410 (89)209,296 
Residential mortgage-backed securities of U.S. government corporations and agencies60,855 553 (966)60,442 66,960 818 — 67,778 
Commercial mortgage-backed securities of U.S. government corporations and agencies347,825 9,339 (658)356,506 258,875 14,806 — 273,681 
Corporate obligations500 — — 500 2,021 5 (1)2,025 
Obligations of states and political subdivisions81,310 4,746 86,056 117,439 6,988 — 124,427 
Total Available-for-Sale Debt Securities (1)
$850,672 $21,392 $(3,070)$868,994 $737,005 $33,478 $(90)$770,393 
(1) Excludes interest receivable of $3.2 million at September 30, 2021 and $3.1 million at December 31, 2020. 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, 2021
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 securities4$43,200 $(248)—$— $— 4$43,200 $(248)
Obligations of U.S. government corporations and agencies—— — —— — —— — 
Collateralized mortgage obligations of U.S. government corporations and agencies788,290 (1,198)—— — 788,290 (1,198)
Residential mortgage-backed securities of U.S. government corporations and agencies348,497 (966)—— — 348,497 (966)
Commercial mortgage-backed securities of U.S. government corporations and agencies7101,479 (658)—— — 7101,479 (658)
Corporate bonds—— — —— — —— — 
Obligations of states and political subdivisions15,000 — —— — 15,000 — 
Total22$286,466 $(3,070)—$— $— 22$286,466 $(3,070)
December 31, 2020
Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses		Number of SecuritiesFair ValueUnrealized
Losses
U.S. Treasury securities—$— $— —$— $— —$— $— 
Obligations of U.S. government corporations and agencies—— — —— — —— — 
Collateralized mortgage obligations of U.S. government corporations and agencies235,697 (89)—— — 235,697 (89)
Residential mortgage-backed securities of U.S. government corporations and agencies—— — —— — —— — 
Commercial mortgage-backed securities of U.S. government corporations and agencies—— — —— — —— — 
Corporate bonds1499 (1)—— — 1499 (1)
Obligations of states and political subdivisions—— — —— — —— — 
Total3$36,196 $(90)—$— $— 3$36,196 $(90)
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, 2021December 31, 2020
(dollars in thousands)Gross Unrealized GainsGross Unrealized LossesNet Unrealized Gains/(Losses)Gross Unrealized GainsGross Unrealized LossesNet Unrealized Gains/(Losses)
Total unrealized gains/(losses) on available-for-sale debt securities$21,392 $(3,070)$18,322 $33,478 $(90)$33,388 
Income tax (expense) benefit(4,569)657 (3,912)(7,128)19 (7,109)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss)$16,823 $(2,413)$14,410 $26,350 $(71)$26,279 
Schedule of Contractual Maturities of Debt Securities
The amortized cost and fair value of available-for-sale debt securities at September 30, 2021 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, 2021
(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$30,428 $30,760 
Due after one year through five years82,551 86,321 
Due after five years through ten years101,252 102,563 
Due after ten years20,936 22,917 
Available-for-Sale Debt Securities With Fixed Maturities235,167 242,561 
Debt Securities without a single maturity date
Collateralized mortgage obligations of U.S. government corporations and agencies206,325 208,985 
Residential mortgage-backed securities of U.S. government corporations and agencies60,855 60,442 
Commercial mortgage-backed securities of U.S. government corporations and agencies347,825 356,506 
Corporate Securities500 500 
Total Available-for-Sale Debt Securities$850,672 $868,994 
Schedule of Unrealized Gains (Losses) on Marketable Securities
The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented:
Three Months Ended September 30,Nine Months Ended September 30,
(dollars in thousands)2021202020212020
Marketable Equity Securities
Net market gains/(losses) recognized$31 $585 $175 $(552)
Less: Net gains recognized for equity securities sold— — 29 142 
Unrealized Gains/(Losses) on Equity Securities Still Held $31 $585 $146 $(694)