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Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at June 30, 2022 were as follows.
 Available-for-Sale
 AmortizedFair
(Dollar amounts in thousands)CostValue
Due in one year or less$16,521 $16,540 
Due after one but within five years45,794 45,110 
Due after five but within ten years82,851 79,055 
Due after ten years411,706 369,468 
 556,872 510,173 
Mortgage-backed securities and collateralized mortgage obligations924,000 828,279 
TOTAL$1,480,872 $1,338,452 
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 June 30, 2022 and December 31, 2021.
 June 30, 2022
 Less Than 12 MonthsMore Than 12 MonthsTotal
  Unrealized Unrealized Unrealized
(Dollar amounts in thousands)Fair ValueLossesFair ValueLossesFair ValueLosses
U.S. Government agencies$97,256 $(7,293)$4,068 $(686)$101,324 $(7,979)
Mortgage Backed Securities - Residential451,262 (50,476)158,530 (28,116)609,792 (78,592)
Mortgage Backed Securities - Commercial8,961 (147)— — 8,961 (147)
Collateralized mortgage obligations164,325 (13,798)21,350 (3,297)185,675 (17,095)
State and municipal obligations251,392 (35,790)6,668 (2,103)258,060 (37,893)
Municipal taxable29,346 (4,542)2,545 (502)31,891 (5,044)
U.S. Treasury2,075 (9)— — 2,075 (9)
Total temporarily impaired securities$1,004,617 $(112,055)$193,161 $(34,704)$1,197,778 $(146,759)
 
 December 31, 2021
 Less Than 12 MonthsMore Than 12 MonthsTotal
  Unrealized Unrealized Unrealized
(Dollar amounts in thousands)Fair ValueLossesFair ValueLossesFair ValueLosses
U.S. Government agencies$48,939 $(739)$146 $(2)$49,085 $(741)
Mortgage Backed Securities - Residential436,726 (5,281)60,807 (1,598)497,533 (6,879)
Collateralized mortgage obligations73,530 (1,327)12,505 (441)86,035 (1,768)
State and municipal obligations54,040 (578)— — 54,040 (578)
Municipal taxable15,048 (195)729 (20)15,777 (215)
U.S. Treasury204 (1)— — 204 (1)
Total temporarily impaired securities$628,487 $(8,121)$74,187 $(2,061)$702,674 $(10,182)
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 six month periods ended June 30, 2022 and 2021:
Three Months Ended June 30,Six Months Ended June 30,
(Dollar amounts in thousands)2022202120222021
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.
June 30, 2022
(Dollar amounts in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Government agencies$117,937 $39 $(7,979)$109,997 
Mortgage Backed Securities - residential691,702 88 (78,592)613,198 
Mortgage Backed Securities - commercial9,108 — (147)8,961 
Collateralized mortgage obligations223,190 25 (17,095)206,120 
State and municipal obligations395,179 1,090 (37,893)358,376 
Municipal taxable38,435 10 (5,044)33,401 
U.S. Treasury2,084 — (9)2,075 
Collateralized debt obligations— 3,087 — 3,087 
Other securities3,237 — — 3,237 
TOTAL$1,480,872 $4,339 $(146,759)$1,338,452 
December 31, 2021
(Dollar amounts in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Government agencies$118,176 $2,688 $(741)$120,123 
Mortgage Backed Securities-residential628,920 4,387 (6,879)626,428 
Mortgage Backed Securities-commercial15,480 191 — 15,671 
Collateralized mortgage obligations175,501 1,272 (1,768)175,005 
State and municipal obligations362,843 17,833 (578)380,098 
Municipal taxable38,445 396 (215)38,626 
U.S. Treasury205 — (1)204 
Collateralized debt obligations— 3,359 — 3,359 
Other securities5,220 — — 5,220 
TOTAL$1,344,790 $30,126 $(10,182)$1,364,734