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INVESTMENT SECURITIES (Tables)
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of available for sale and held to maturity investment securities
A summary of our available-for-sale investment securities as of December 31, 2021 and 2020 are as follows:
 
(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
December 31, 2021    
Available-for-Sale:
Debt securities:
States and political subdivisions$235,521 $3,156 $(1,849)$236,828 
Corporate securities41,687 24 (1,065)40,646 
U.S. Treasury obligations and direct obligations of U.S Government agencies35,833 69 (568)35,334 
Mortgage-backed securities:
Residential - U.S. Government-sponsored entities ("GSEs")1,213,910 4,899 (19,993)1,198,816 
Residential - Non-government sponsored entities ("Non-GSEs")11,942 335 (64)12,213 
Commercial - U.S. GSEs and agencies66,287 756 (1,194)65,849 
Commercial - Non-GSEs41,328 685 — 42,013 
Total available-for-sale investment securities$1,646,508 $9,924 $(24,733)$1,631,699 
Equity securities$— $— $— $— 

(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
December 31, 2020    
Available-for-Sale:    
Debt securities:    
States and political subdivisions$163,573 $5,370 $(177)$168,766 
Corporate securities47,351 788 (131)48,008 
U.S. Treasury obligations and direct obligations of U.S Government agencies33,413 18 (286)33,145 
Mortgage-backed securities:   
Residential - U.S. GSEs762,309 16,816 (299)778,826 
Residential - Non-GSEs22,671 786 (34)23,423 
Commercial - U.S. GSEs and agencies85,405 2,564 (500)87,469 
Commercial - Non-GSEs41,309 1,663 — 42,972 
Total available-for-sale investment securities$1,156,031 $28,005 $(1,427)$1,182,609 
Equity securities$1,068 $283 $— $1,351 
Amortized Cost and Fair Value of Equity Investment Securities
The amortized cost and fair value of our equity investment securities is as follows:
(Dollars in thousands)Amortized CostFair Value
December 31, 2021
Equity securities$— $— 
December 31, 2020
Equity securities1,068 1,351 
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity
The amortized cost and estimated fair value of our investment securities at December 31, 2021 by contractual maturity are shown below. Actual maturities may differ from contractual maturities as issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
 
 December 31, 2021
(Dollars in thousands)Amortized CostFair Value
Available-for-Sale:
Due in one year or less$18,958 $19,002 
Due after one year through five years21,579 22,190 
Due after five years through ten years84,715 84,411 
Due after ten years187,789 187,205 
Mortgage-backed securities
Residential - U.S. GSEs1,213,910 1,198,816 
Residential - Non-GSEs11,942 12,213 
Commercial - U.S. GSEs and agencies66,287 65,849 
Commercial - Non-GSEs41,328 42,013 
Total available-for-sale investment securities$1,646,508 $1,631,699 
Equity securities$— $— 
Schedule of investment securities in an unrealized loss position The following table summarizes securities which were in an unrealized or unrecognized loss position at
December 31, 2021 and 2020, aggregated by major security type and length of time in a continuous unrealized or unrecognized loss position:
 
 Less Than 12 Months12 Months or LongerTotal
Description of SecuritiesFair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
 (Dollars in thousands)
December 31, 2021      
Debt securities:      
States and political subdivisions$79,360 $(1,252)$10,864 $(597)$90,224 $(1,849)
Corporate securities8,633 (235)21,960 (830)30,593 (1,065)
U.S. Treasury obligations and direct obligations of U.S Government agencies16,103 (415)10,891 (153)26,994 (568)
Mortgage-backed securities:
Residential - U.S. GSEs926,570 (15,883)114,747 (4,110)1,041,317 (19,993)
Residential - Non-GSEs— — 938 (64)938 (64)
Commercial - U.S. GSEs and agencies6,313 (205)16,281 (989)22,594 (1,194)
Total temporarily impaired securities$1,036,979 $(17,990)$175,681 $(6,743)$1,212,660 $(24,733)

 Less Than 12 Months12 Months or LongerTotal
Description of SecuritiesFair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
 (Dollars in thousands)
December 31, 2020      
Debt securities:      
States and political subdivisions$21,313 $(177)$— $— $21,313 $(177)
U.S. Treasury obligations and direct obligations of U.S Government agencies5,980 (24)20,925 (262)26,905 (286)
Mortgage-backed securities:      
Residential - U.S. GSEs76,402 (299)— — 76,402 (299)
Residential - Non-GSEs989 (34)— — 989 (34)
Commercial - U.S. GSEs and agencies16,977 (500)— — 16,977 (500)
Total temporarily impaired securities$126,530 $(1,165)$20,925 $(262)$147,455 $(1,427)