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INVESTMENT SECURITIES (Tables)
12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Summary of available for sale and held to maturity investment securities
The amortized cost, gross unrealized gains and losses, fair value and related allowance for credit losses on held-to-maturity ("HTM") and available-for-sale ("AFS") investment securities as of December 31, 2022 and 2021 are as follows:
 
(Dollars in thousands)Amortized
Cost
Gross
Unrecognized
Gains
Gross
Unrecognized
Losses
Fair
Value
ACL
December 31, 2022    
Held-to-Maturity:    
Debt securities:
States and political subdivisions$41,840 $— $(4,727)$37,113 $— 
Mortgage-backed securities:
Residential - U.S. Government-sponsored entities ("GSEs")623,043 — (63,376)559,667 — 
Total held-to-maturity investment securities$664,883 $— $(68,103)$596,780 $— 
(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
ACL
Available-for-Sale:
Debt securities:
States and political subdivisions$172,427 $$(36,681)$135,752 $— 
Corporate securities36,206 — (5,995)30,211 — 
U.S. Treasury obligations and direct obligations of U.S Government agencies28,032 — (2,317)25,715 — 
Mortgage-backed securities:
Residential - U.S. Government-sponsored entities ("GSEs")498,989 — (75,186)423,803 — 
Residential - Non-government sponsored entities ("Non-GSEs")9,829 — (1,167)8,662 — 
Commercial - U.S. GSEs and agencies54,346 — (8,202)46,144 — 
Commercial - Non-GSEs1,541 — (34)1,507 — 
Total available-for-sale investment securities$801,370 $$(129,582)$671,794 $— 

(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
ACL
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. GSEs1,213,910 4,899 (19,993)1,198,816 — 
Residential - Non-GSEs11,942 335 (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 $— 
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, 2022 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, 2022
(Dollars in thousands)Amortized CostFair Value
Weighted Average Yield (1)
Held-to-Maturity:  
Due in one year or less$— $— — %
Due after one year through five years— — — 
Due after five years through ten years— — — 
Due after ten years41,840 37,113 2.26 
Mortgage-backed securities:
Residential - U.S. Government-sponsored entities ("GSEs")623,043 559,667 1.93 
Total held-to-maturity investment securities$664,883 $596,780 1.95 %
Available-for-Sale:
Due in one year or less$5,774 $5,751 2.91 %
Due after one year through five years15,816 15,458 3.75 
Due after five years through ten years79,803 70,558 2.60 
Due after ten years135,272 99,911 2.43 
Mortgage-backed securities
Residential - U.S. GSEs498,989 423,803 2.03 
Residential - Non-GSEs9,829 8,662 3.33 
Commercial - U.S. GSEs and agencies54,346 46,144 2.35 
Commercial - Non-GSEs1,541 1,507 4.10 
Total available-for-sale investment securities$801,370 $671,794 2.24 %
Total investment securities$1,466,253 $1,268,574 2.10 %

(1)Weighted-average yields are computed on an annual basis, and yields on tax-exempt obligations are computed on a taxable-equivalent basis using a federal statutory tax rate of 21%.
Schedule of investment securities in an unrealized loss position
The following table summarizes HTM and AFS securities which were in an unrealized or unrecognized loss position at December 31, 2022 and 2021, 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 ValueUnrecognized LossesFair ValueUnrecognized LossesFair ValueUnrecognized Losses
 (Dollars in thousands)
December 31, 2022      
Held-to-Maturity:
Debt securities:
States and political subdivisions$37,113 $(4,727)$— $— $37,113 $(4,727)
Mortgage-backed securities:
Residential - U.S. Government-sponsored entities ("GSEs")559,667 (63,376)— — 559,667 (63,376)
Total temporarily impaired HTM investment securities$596,780 $(68,103)$— $— $596,780 $(68,103)

Less Than 12 Months12 Months or LongerTotal
Description of SecuritiesFair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
(Dollars in thousands)
December 31, 2022
Available-for-Sale:
Debt securities:      
States and political subdivisions$52,244 $(4,807)$78,389 $(31,874)$130,633 $(36,681)
Corporate securities— — 30,211 (5,995)30,211 (5,995)
U.S. Treasury obligations and direct obligations of U.S Government agencies9,651 (245)15,541 (2,072)25,192 (2,317)
Mortgage-backed securities:
Residential - U.S. GSEs149,624 (13,990)274,179 (61,196)423,803 (75,186)
Residential - Non-GSEs2,890 (334)5,772 (833)8,662 (1,167)
Commercial - U.S. GSEs and agencies25,034 (1,724)21,110 (6,478)46,144 (8,202)
Commercial - Non-GSEs1,506 (34)— — 1,506 (34)
Total temporarily impaired AFS investment securities$240,949 $(21,134)$425,202 $(108,448)$666,151 $(129,582)
Less Than 12 Months12 Months or LongerTotal
Description of SecuritiesFair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
(Dollars in thousands)
December 31, 2021
Available-for-Sale:
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 AFS investment securities$1,036,979 $(17,990)$175,681 $(6,743)$1,212,660 $(24,733)