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Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
March 31, 2021
(Dollar amounts in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Government agencies$95,361 $3,676 $(95)$98,942 
Mortgage Backed Securities - residential447,454 7,162 (5,137)449,479 
Mortgage Backed Securities - commercial15,808 440 — 16,248 
Collateralized mortgage obligations179,460 3,975 (174)183,261 
State and municipal obligations305,159 16,976 (892)321,243 
Municipal taxable24,132 208 (407)23,933 
U.S. Treasury658 1 — 659 
Collateralized debt obligations— 3,328 — 3,328 
TOTAL$1,068,032 $35,766 $(6,705)$1,097,093 
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 
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at March 31, 2021 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and equity securities are shown separately.
 Available-for-Sale
 AmortizedFair
(Dollar amounts in thousands)CostValue
Due in one year or less$11,871 $11,982 
Due after one but within five years47,557 49,041 
Due after five but within ten years61,647 64,494 
Due after ten years304,235 322,588 
 425,310 448,105 
Mortgage-backed securities and collateralized mortgage obligations642,722 648,988 
TOTAL$1,068,032 $1,097,093 
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 March 31, 2021 and December 31, 2020. 
 March 31, 2021
 Less Than 12 MonthsMore Than 12 MonthsTotal
  Unrealized Unrealized Unrealized
(Dollar amounts in thousands)Fair ValueLossesFair ValueLossesFair ValueLosses
U.S. Government agencies$4,907 $(94)$185 $(1)$5,092 $(95)
Mortgage Backed Securities - Residential$267,771 $(5,137)$— $— $267,771 $(5,137)
Collateralized mortgage obligations26,296 (173)3,823 (1)30,119 (174)
State and municipal obligations52,179 (892)— — 52,179 (892)
Municipal taxable13,122 (407)— — 13,122 (407)
Total temporarily impaired securities$364,275 $(6,703)$4,008 $(2)$368,283 $(6,705)
 
 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 - Residential$76,962 $(279)$— $— $76,962 $(279)
Mortgage Backed Securities - Commercial— — — — — — 
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 month periods ended March 31, 2021 and 2020:
Three Months Ended March 31,
(Dollar amounts in thousands)20212020
Beginning balance$2,974 $2,974 
Reductions for securities called during the period— — 
Ending balance$2,974 $2,974