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Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at September 30, 2021 were as follows.
 Available-for-Sale
 AmortizedFair
(Dollar amounts in thousands)CostValue
Due in one year or less$12,587 $12,658 
Due after one but within five years46,094 47,490 
Due after five but within ten years71,063 74,923 
Due after ten years362,734 382,615 
 492,478 517,686 
Mortgage-backed securities and collateralized mortgage obligations750,282 753,134 
TOTAL$1,242,760 $1,270,820 
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position
The following tables show the securities’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at September 30, 2021 and December 31, 2020. 
 September 30, 2021
 Less Than 12 MonthsMore Than 12 MonthsTotal
  Unrealized Unrealized Unrealized
(Dollar amounts in thousands)Fair ValueLossesFair ValueLossesFair ValueLosses
U.S. Government agencies$28,142 $(364)$159 $(2)$28,301 $(366)
Mortgage Backed Securities - Residential341,414 (5,047)4,746 (118)346,160 (5,165)
Collateralized mortgage obligations53,536 (702)7,938 (70)61,474 (772)
State and municipal obligations64,791 (770)— — 64,791 (770)
Municipal taxable6,459 (49)731 (19)7,190 (68)
U.S. Treasury— — — — — — 
Total temporarily impaired securities$494,342 $(6,932)$13,574 $(209)$507,916 $(7,141)
 
 December 31, 2020
 Less Than 12 MonthsMore Than 12 MonthsTotal
  Unrealized Unrealized Unrealized
(Dollar amounts in thousands)Fair ValueLossesFair ValueLossesFair ValueLosses
U.S. Government agencies$— $— $944 $(1)$944 $(1)
Mortgage Backed Securities - Residential76,962 (279)— — 76,962 (279)
Collateralized mortgage obligations12,282 (108)3,767 (49)16,049 (157)
State and municipal obligations747 (3)— — 747 (3)
U.S. Treasury250 — — — 250 — 
Total temporarily impaired securities$90,241 $(390)$4,711 $(50)$94,952 $(440)
Rollforward of the credit losses recognized in earnings
The table below presents a rollforward of the credit losses recognized in earnings for the three and nine month periods ended September 30, 2021 and 2020:
Three Months Ended September 30,Nine Months Ended September 30,
(Dollar amounts in thousands)2021202020212020
Beginning balance$2,974 $2,974 $2,974 $2,974 
Reductions for securities called during the period— — — — 
Ending balance$2,974 $2,974 $2,974 $2,974 
Debt Securities, Available-for-sale All securities are classified as available-for-sale.
September 30, 2021
(Dollar amounts in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Government agencies$115,492 $3,965 $(366)$119,091 
Mortgage Backed Securities - residential574,048 6,056 (5,165)574,939 
Mortgage Backed Securities - commercial15,591 336 — 15,927 
Collateralized mortgage obligations160,643 2,397 (772)162,268 
State and municipal obligations345,263 18,664 (770)363,157 
Municipal taxable31,067 539 (68)31,538 
U.S. Treasury656 — — 656 
Collateralized debt obligations— 3,244 — 3,244 
TOTAL$1,242,760 $35,201 $(7,141)$1,270,820 
December 31, 2020
(Dollar amounts in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Government agencies$92,710 $5,105 $(1)$97,814 
Mortgage Backed Securities-residential346,606 8,794 (279)355,121 
Mortgage Backed Securities-commercial17,931 559 — 18,490 
Collateralized mortgage obligations209,556 4,761 (157)214,160 
State and municipal obligations285,837 20,294 — 306,131 
Municipal taxable22,440 702 (3)23,139 
U.S. Treasury2,750 3 — 2,753 
Collateralized debt obligations— 3,136 — 3,136 
TOTAL$977,830 $43,354 $(440)$1,020,744