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SECURITIES
6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
SECURITIES
The amortized cost, gross unrealized gains and losses and estimated fair value of securities at June 30, 2023 and December 31, 2022 are summarized as follows (in thousands):
 June 30, 2023
 Amortized CostFair Value
Trading:
Corporate bonds$27,203 $25,659 
$27,203 $25,659 
 June 30, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
Available-for-Sale:
U.S. Government and agency obligations$49,471 $14 $(1,123)$— $48,362 
Municipal bonds194,660 181 (34,073)— 160,768 
Corporate bonds118,160 — (16,372)(2,000)99,788 
Mortgage-backed or related securities2,294,371 275 (352,248)— 1,942,398 
Asset-backed securities222,517 63 (7,936)— 214,644 
 $2,879,179 $533 $(411,752)$(2,000)$2,465,960 
 June 30, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAllowance for Credit Losses
Held-to-Maturity:
U.S. Government and agency obligations$309 $— $(7)$302 $— 
Municipal bonds497,546 105 (62,883)434,598 (170)
Corporate bonds2,844 — (24)2,635 (185)
Mortgage-backed or related securities598,226 — (102,645)495,581 — 
$1,098,925 $105 $(165,559)$933,116 $(355)
December 31, 2022
Amortized CostFair Value
Trading:
Corporate bonds$27,203 $28,694 
$27,203 $28,694 

December 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Available-for-Sale:
U.S. Government and agency obligations$56,344 $$(1,244)$55,108 
Municipal bonds301,449 530 (40,770)261,209 
Corporate bonds133,334 — (11,481)121,853 
Mortgage-backed or related securities2,505,172 885 (366,721)2,139,336 
Asset-backed securities222,478 40 (10,993)211,525 
$3,218,777 $1,463 $(431,209)$2,789,031 

December 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAllowance for Credit Losses
Held-to-Maturity:
U.S. Government and agency obligations$312 $— $(7)$305 $— 
Municipal bonds503,117 109 (70,907)432,319 (183)
Corporate bonds2,961 — (16)2,945 (196)
Mortgage-backed or related securities611,577 — (104,966)506,611 — 
$1,117,967 $109 $(175,896)$942,180 $(379)

Accrued interest receivable on held-to-maturity debt securities was $4.7 million and $4.8 million as of June 30, 2023 and December 31, 2022, respectively, and was $11.1 million and $12.4 million on available-for-sale debt securities at June 30, 2023 and December 31, 2022, respectively. Accrued interest receivable on securities is reported in accrued interest receivable on the Consolidated Statements of Financial Condition and is excluded from the calculation of the allowance for credit losses.

At June 30, 2023 and December 31, 2022, the gross unrealized losses and the fair value for securities available-for-sale aggregated by the length of time that individual securities have been in a continuous unrealized loss position were as follows (in thousands):
June 30, 2023
Less Than 12 Months12 Months or MoreTotal
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available-for-Sale:
U.S. Government and agency obligations
$— $— $45,207 $(1,123)$45,207 $(1,123)
Municipal bonds
34,744 (559)119,287 (33,514)154,031 (34,073)
Corporate bonds
9,599 (314)95,502 (16,058)105,101 (16,372)
Mortgage-backed or related securities
259,765 (9,381)1,635,349 (342,867)1,895,114 (352,248)
Asset-backed securities
121,210 (4,603)83,292 (3,333)204,502 (7,936)
$425,318 $(14,857)$1,978,637 $(396,895)$2,403,955 $(411,752)
December 31, 2022
Less Than 12 Months12 Months or MoreTotal
Fair Value Unrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available-for-Sale:
U.S. Government and agency obligations
$33,407 $(882)$16,732 $(362)$50,139 $(1,244)
Municipal bonds
188,920 (25,592)33,907 (15,178)222,827 (40,770)
Corporate bonds
108,187 (9,547)13,066 (1,934)121,253 (11,481)
Mortgage-backed or related securities
930,566 (90,537)1,159,110 (276,184)2,089,676 (366,721)
Asset-backed securities
201,437 (10,993)— — 201,437 (10,993)
$1,462,517 $(137,551)$1,222,815 $(293,658)$2,685,332 $(431,209)

At June 30, 2023, there were 245 securities—available-for-sale with unrealized losses, compared to 298 at December 31, 2022. As of June 30, 2023, we have an allowance for credit losses of $2.0 million related to the estimated credit loss on one security.  Management does not believe that any remaining individual unrealized loss as of June 30, 2023 or December 31, 2022 resulted from credit loss.  The decline in fair market value of these securities was generally due to changes in interest rates and changes in market-desired spreads subsequent to their purchase.

There were no sales of securities—trading during the six months ended June 30, 2023 or 2022. There were no securities—trading in a nonaccrual status at June 30, 2023 or December 31, 2022.  Net unrealized holding losses of $3.0 million were recognized during the six months ended June 30, 2023, compared to $905,000 of net unrealized holding gains recognized during the six months ended June 30, 2022.

The following table presents gross gains and losses on sales and partial calls of securities available-for-sale (in thousands):
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2023202220232022
Available-for-Sale:
Gross Gains$145 $81 $377 $516 
Gross Losses(4,672)(49)(12,156)(49)
Balance, end of the period$(4,527)$32 $(11,779)$467 

There were no securities—available-for-sale in a nonaccrual status at June 30, 2023 or December 31, 2022.

The following table presents the amortized cost and estimated fair value of securities at June 30, 2023, by contractual maturity and does not reflect any required periodic payments (in thousands). Expected maturities will differ from contractual maturities because some securities may be called or prepaid with or without call or prepayment penalties.
 June 30, 2023
TradingAvailable-for-SaleHeld-to-Maturity
 Amortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
Maturing within one year$— $— $719 $716 $21,769 $21,243 
Maturing after one year through five years— — 158,285 143,916 21,090 20,352 
Maturing after five years through ten years— — 416,915 364,317 26,732 25,554 
Maturing after ten years27,203 25,659 2,303,260 1,957,011 1,029,334 865,967 
 $27,203 $25,659 $2,879,179 $2,465,960 $1,098,925 $933,116 
The following table presents, as of June 30, 2023, investment securities which were pledged to secure borrowings, public deposits or other obligations as permitted or required by law (in thousands):
June 30, 2023
Carrying ValueAmortized CostFair Value
Purpose or beneficiary:
State and local governments public deposits$248,951 $256,711 $224,566 
Federal Reserve118,643 118,643 100,314 
Interest rate swap counterparties3,039 3,249 2,865 
Repurchase transaction accounts273,613 273,613 225,628 
Other 4,779 4,779 4,558 
Total pledged securities$649,025 $656,995 $557,931 

The Company monitors the credit quality of held-to-maturity debt securities through the use of credit ratings which are reviewed and updated quarterly. The Company’s non-rated held-to-maturity debt securities are primarily United States government sponsored enterprise debentures carrying minimal to no credit risk. The non-rated corporate bonds primarily consist of Community Reinvestment Act related bonds secured by loan instruments from low to moderate income borrowers. The remaining non-rated held-to-maturity debt securities balance is comprised of local municipal debt from within the Company’s geographic footprint and is monitored through quarterly or annual financial review. This municipal debt is predominately essential service or unlimited general obligation backed debt. The following tables summarize the amortized cost of held-to-maturity debt securities by credit rating at June 30, 2023 and December 31, 2022 (in thousands):
June 30, 2023
U.S. Government and agency obligationsMunicipal bondsCorporate bondsMortgage-backed or related securitiesTotal
AAA/AA/A$— $487,763 $500 $16,574 $504,837 
Not Rated309 9,783 2,344 581,652 594,088 
$309 $497,546 $2,844 $598,226 $1,098,925 

December 31, 2022
U.S. Government and agency obligationsMunicipal bondsCorporate bondsMortgage-backed or related securitiesTotal
AAA/AA/A$— $492,105 $500 $16,681 $509,286 
Not Rated312 11,012 2,461 594,896 608,681 
$312 $503,117 $2,961 $611,577 $1,117,967 

The following tables present the activity in the allowance for credit losses for securities available-for-sale by major type for the three and six months ended June 30, 2023 (in thousands). We had no allowance for credit losses for securities available-for-sale during three and six months ended June 30, 2022.
For the Three Months Ended June 30, 2023
U.S. Government and agency obligationsMunicipal bondsCorporate bondsMortgage-backed or related securitiesTotal
Allowance for credit losses – securities available-for-sale
Beginning balance$— $— $— $— $— 
Provision for credit losses— — 2,000 — 2,000 
Ending balance$— $— $2,000 $— $2,000 
For the Six Months Ended June 30, 2023
U.S. Government and agency obligationsMunicipal bondsCorporate bondsMortgage-backed or related securitiesTotal
Allowance for credit losses – securities available-for-sale
Beginning balance$— $— $— $— $— 
Provision for credit losses— — 2,000 — 2,000 
Ending balance$— $— $2,000 $— $2,000