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Securities Available for Sale
 6 Months Ended
Jun. 30, 2023
Debt Securities, Available-for-Sale [Abstract]  
Securities Available for Sale Investment Securities
The following is a summary of investment securities as of the dates indicated:
 June 30, 2023December 31, 2022
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (Dollars in thousands)
Debt securities available for sale:
U.S. Treasury securities$3,994 $— $(90)$3,904 $3,990 $— $(104)$3,886 
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities4,000 — (163)3,837 4,000 — (133)3,867 
Collateralized mortgage obligations904,848 — (153,108)751,740 947,541 — (153,842)793,699 
Mortgage-backed securities:
Residential522,145 — (86,997)435,148 544,084 — (90,907)453,177 
Commercial407,972 — (55,121)352,851 417,241 — (48,954)368,287 
Asset-backed securities153,536 — (3,794)149,742 153,539 — (5,935)147,604 
Corporate securities23,326 — (4,754)18,572 23,351 — (4,494)18,857 
Municipal securities213,913 1,082 (14,203)200,792 195,675 790 (13,713)182,752 
Total investment securities available for sale$2,233,734 $1,082 $(318,230)$1,916,586 $2,289,421 $790 $(318,082)$1,972,129 
Debt securities held to maturity:
U.S. Government agency and U.S. Government sponsored enterprises:
Mortgage-backed securities:
Residential$154,963 $— $(6,919)$148,044 $157,881 $— $(7,041)$150,840 
Commercial114,797 — (7,497)107,300 113,185 1 (5,619)107,567 
Total investment securities held to maturity$269,760 $— $(14,416)$255,344 $271,066 $1 $(12,660)$258,407 
The Company has elected to exclude accrued interest from the amortized cost of its investment debt securities. Accrued interest receivable for investment debt securities at June 30, 2023 and December 31, 2022, totaled $8.5 million and $7.8 million, respectively.
At June 30, 2023 and December 31, 2022, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.
At June 30, 2023 and December 31, 2022, $223.0 million and $223.1 million in unrealized losses on investment securities AFS, net of taxes, respectively, were included in accumulated other comprehensive income (loss). For the three and six months ended June 30, 2023 and 2022, there were no reclassifications out of accumulated other comprehensive income (loss) into earnings resulting from the sale of investments securities AFS.
The following table presents a breakdown of interest income recorded for investment securities that are taxable and nontaxable.
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
 (Dollars in thousands)
Interest income on investment securities
Taxable$14,466 $11,997 $28,512 $23,397 
Nontaxable1,068 311 2,147 567 
Total$15,534 $12,308 $30,659 $23,964 
The amortized cost and estimated fair value of investment securities at June 30, 2023, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties.
Available for SaleHeld to Maturity
Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
 (Dollars in thousands)
Debt securities:
Due within one year$4,984 $4,885 $— $— 
Due after one year through five years147,521 136,859 26,641 25,589 
Due after five years through ten years108,760 97,284 8,546 8,120 
Due after ten years1,972,469 1,677,558 234,573 221,635 
Total$2,233,734 $1,916,586 $269,760 $255,344 

Securities with carrying values of approximately $2.01 billion and $360.7 million at June 30, 2023 and December 31, 2022, respectively, were pledged to secure public deposits, for various borrowings, and for other purposes as required or permitted by law.
The following tables show the Company’s investments’ gross unrealized losses and estimated fair values, aggregated by investment category and the length of time that the individual securities have been in a continuous unrealized loss position as of the dates indicated. The length of time that the individual securities have been in a continuous unrealized loss position is not a factor in determining credit impairment with the adoption of current expected credit losses (“CECL”).    
June 30, 2023
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
U.S. Treasury securities— $— $— 1 $3,904 $(90)1 $3,904 $(90)
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities— — — 1 3,837 (163)1 3,837 (163)
Collateralized mortgage obligations6 14,563 (1,078)112 737,177 (152,030)118 751,740 (153,108)
Mortgage-backed securities:
Residential2 5,062 (266)63 430,086 (86,731)65 435,148 (86,997)
Commercial8 48,910 (2,633)48 303,941 (52,488)56 352,851 (55,121)
Asset-backed securities— — — 18 149,742 (3,794)18 149,742 (3,794)
Corporate securities— — — 6 18,572 (4,754)6 18,572 (4,754)
Municipal securities29 73,327 (1,148)38 82,766 (13,055)67 156,093 (14,203)
Total45 $141,862 $(5,125)287 $1,730,025 $(313,105)332 $1,871,887 $(318,230)

December 31, 2022
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
U.S. Treasury securities1 $3,886 $(104)— $— $— 1 $3,886 $(104)
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities1 3,867 (133)— — — 1 3,867 (133)
Collateralized mortgage obligations61 150,419 (14,888)59 643,280 (138,954)120 793,699 (153,842)
Mortgage-backed securities:
Residential23 55,645 (5,616)42 397,532 (85,291)65 453,177 (90,907)
Commercial29 172,963 (12,156)26 195,324 (36,798)55 368,287 (48,954)
Asset-backed securities3 21,836 (716)15 125,768 (5,219)18 147,604 (5,935)
Corporate securities1 3,401 (600)5 15,456 (3,894)6 18,857 (4,494)
Municipal securities31 76,942 (3,207)32 65,730 (10,506)63 142,672 (13,713)
Total150 $488,959 $(37,420)179 $1,443,090 $(280,662)329 $1,932,049 $(318,082)
The Company had U.S. Treasury securities, agency securities, collateralized mortgage obligations, mortgage-backed, asset-backed, corporate, and municipal securities classified as AFS that were in a continuous loss position for twelve months or longer at June 30, 2023. The collateralized mortgage obligations and mortgage-backed securities were investments in U.S. Government agency and U.S. Government sponsored enterprises and have high credit ratings (“AA” grade or better). The interest on other securities that were in an unrealized loss position has been paid as agreed, and the Company believes this will continue in the future and that the securities will be paid in full as scheduled. The market value declines for these securities were primarily due to movements in interest rates and are not reflective of management’s expectations of the Company’s ability to fully recover any unrealized losses, which may be at maturity. With the adoption of CECL, the length of time that the fair value of investment securities has been less than amortized cost is not considered when assessing for credit impairment.
Allowance for Credit Losses on Securities Available for Sale—The Company evaluates investment securities AFS in unrealized loss positions for impairment related to credit losses on at least a quarterly basis. Investment securities AFS in unrealized loss positions are first assessed as to whether the Company intends to sell, or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis. If one of the criteria is met, the security’s amortized cost basis is written down to fair value through current earnings. For securities that do not meet these criteria, the Company evaluates whether the decline in fair value resulted from credit losses or other factors. In evaluating whether a credit loss exists, the Company has set up an initial filter for impairment triggers. Once the quantitative filters have been triggered, the securities are placed on a watch list and an additional assessment is performed to identify whether a credit impairment exists. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security and the issuer, among other factors. If this assessment indicates that a credit loss exists, the Company compares the present value of cash flows expected to be collected from the security with the amortized cost basis. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount that the fair value of the security is less than its amortized cost basis. Unrealized losses that have not been recorded through an allowance for credit losses are recognized in other comprehensive income, net of applicable taxes. The Company did not have an allowance for credit losses on investment securities AFS at June 30, 2023 and December 31, 2022.
83.1% of the Company’s investment portfolio at June 30, 2023, consisted of securities that were issued by U.S. Government agency and U.S. Government sponsored enterprises. Although a government guarantee exists on these investments, these entities are not legally backed by the full faith and credit of the federal government, and the current support is subject to a cap as part of the Housing and Economic Recovery Act of 2008. Nonetheless, at this time the Company does not foresee any set of circumstances in which the government would not fund its commitments on these investments as the issuers are an integral part of the U.S. housing market in providing liquidity and stability. Therefore, the Company concluded that a zero allowance approach for these investments was appropriate. The Company had one U.S. Treasury note issued and guaranteed by the U.S. government. The Company also had 18 asset-backed securities, six corporate securities, and 67 municipal bonds in unrealized loss positions at June 30, 2023. The Company performed an assessment of investments in unrealized loss positions for credit impairment and concluded that no allowance for credit losses was required at June 30, 2023.
Allowance for Credit Losses on Securities Held to Maturity—For each major HTM debt security type, the allowance for credit losses is estimated collectively for groups of securities with similar risk characteristics. For securities that do not share similar risk characteristics, the losses are estimated individually. Debt securities that are issued by the U.S. government or government-sponsored enterprises, are highly rated by major rating agencies, and have a long history of no credit losses are an example of such securities to which the Company applies a zero credit loss assumption. Any expected credit loss is provided through the allowance for credit losses on investment securities HTM and deducted from the amortized cost basis of the security, so that the balance sheet reflects the net amount the Company expects to collect. At June 30, 2023, all of the Company’s investment securities HTM were issued by the U.S. government or government-sponsored enterprises. The Company did not have an allowance for credit losses on investment securities HTM at June 30, 2023 and December 31, 2022.