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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Held-To-Maturity and Available-For-Sale Investment Securities
The following is a summary of HTM and AFS investment securities as of June 30, 2020:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost		Unrecognized gainUnrecognized lossFair
value		Amortized
cost		Unrealized
gain		Unrealized
loss		Fair
value
U.S. Treasuries$0  $0  $0  $0  $99  $4  $0  $103  
Securities of U.S. government agencies and corporations0  0  0  0  116  2  0  118  
Mortgage-backed securities - residential 18,560  364  0  18,924  413,981  17,630  (88) 431,523  
Mortgage-backed securities - commercial 90,005  4,000  0  94,005  489,962  11,016  (6,421) 494,557  
Collateralized mortgage obligations8,123  108  0  8,231  729,540  31,197  (139) 760,598  
Obligations of state and other political subdivisions10,659  1,137  0  11,796  711,854  36,206  (66) 747,994  
Asset-backed securities0  0  0  0  380,715  2,290  (6,947) 376,058  
Other securities0  0  0  0  88,932  173  (2,643) 86,462  
Total$127,347  $5,609  $0  $132,956  $2,815,199  $98,518  $(16,304) $2,897,413  

The following is a summary of HTM and AFS investment securities as of December 31, 2019:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost		Unrecognized gainUnrecognized
loss		Fair
value		Amortized
cost		Unrealized
gain		Unrealized
loss		Fair
value
U.S. Treasuries$0  $0  $0  $0  $99  $1  $0  $100  
Securities of U.S. government agencies and corporations0  0  0  0  156  2  0  158  
Mortgage-backed securities - residential 20,818  122  (174) 20,766  421,945  9,709  (99) 431,555  
Mortgage-backed securities - commercial 101,267  571  (1,225) 100,613  474,174  4,988  (2,644) 476,518  
Collateralized mortgage obligations9,763  0  (108) 9,655  769,076  16,753  (385) 785,444  
Obligations of state and other political subdivisions11,014  804  (31) 11,787  652,986  23,729  (462) 676,253  
Asset-backed securities0  0  0  0  400,081  1,414  (1,064) 400,431  
Other securities0  0  0  0  79,781  1,959  (115) 81,625  
Total$142,862  $1,497  $(1,538) $142,821  $2,798,298  $58,555  $(4,769) $2,852,084  
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by contractual maturity as of June 30, 2020, except for residential and commercial mortgage-backed securities, collateralized mortgage obligations and asset-backed securities, which are shown as single totals due to the unpredictability of the timing in principal repayments.
 Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost		Fair
value		Amortized
cost		Fair
value
By Contractual Maturity:
Due in one year or less$0  $0  $4,126  $4,162  
Due after one year through five years0  0  55,428  56,534  
Due after five years through ten years4,840  5,720  153,966  156,133  
Due after ten years5,819  6,076  587,481  617,848  
Mortgage-backed securities - residential 18,560  18,924  413,981  431,523  
Mortgage-backed securities - commercial 90,005  94,005  489,962  494,557  
Collateralized mortgage obligations8,123  8,231  729,540  760,598  
Asset-backed securities0  0  380,715  376,058  
Total$127,347  $132,956  $2,815,199  $2,897,413  
Age of Gross Unrealized Losses and Associated Fair Value by Investment Category
The following tables provide the fair value and gross unrealized losses on investment securities in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by investment category and the length of time the individual securities have been in a continuous loss position:
 June 30, 2020
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
value		Unrealized
loss		Fair
value		Unrealized
loss		Fair
value		Unrealized
loss
U.S. Treasuries$0  $0  $0  $0  $0  $0  
Securities of U.S. Government agencies and corporations0  0  0  0  0  0  
Mortgage-backed securities - residential 16,202  (88) 0  0  16,202  (88) 
Mortgage-backed securities - commercial 131,442  (2,627) 32,987  (3,794) 164,429  (6,421) 
Collateralized mortgage obligations43,648  (139) 1  0  43,649  (139) 
Obligations of state and other political subdivisions37,979  (66) 0  0  37,979  (66) 
Asset-backed securities190,047  (4,702) 65,165  (2,245) 255,212  (6,947) 
Other securities58,500  (2,126) 4,303  (517) 62,803  (2,643) 
Total$477,818  $(9,748) $102,456  $(6,556) $580,274  $(16,304) 
 December 31, 2019
 Less than 12 months12 months or moreTotal
 FairUnrealizedFairUnrealizedFairUnrealized
(Dollars in thousands)valuelossvaluelossvalueloss
U.S. Treasuries$0  $0  $0  $0  $0  $0  
Securities of U.S. Government agencies and corporations0  0  0  0  0  0  
Mortgage-backed securities - residential40,190  (209) 11,063  (64) 51,253  (273) 
Mortgage-backed securities - commercial111,658  (298) 104,069  (3,571) 215,727  (3,869) 
Collateralized mortgage obligations85,248  (297) 30,628  (196) 115,876  (493) 
Obligations of state and other political subdivisions118,623  (457) 7,950  (36) 126,573  (493) 
Asset-backed securities125,889  (553) 54,963  (511) 180,852  (1,064) 
Other securities0  0  5,649  (115) 5,649  (115) 
Total$481,608  $(1,814) $214,322  $(4,493) $695,930  $(6,307)