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Securities
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Securities SECURITIES
The significant accounting policies related to securities are presented in Note 1, "Summary of Significant Accounting Policies" to the Consolidated Financial Statements in the Company's 2020 10-K.
A summary of the Company's securities portfolio by category and maturity is presented in the following tables.
Securities Portfolio
(Dollar amounts in thousands)
 As of September 30, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$— $— $— $— $12,001 $50 $— $12,051 
U.S. agency securities675,866 1,434 (21,188)656,112 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,304,762 11,633 (20,851)1,295,544 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		854,852 8,170 (6,926)856,096 566,830 14,650 (640)580,840 
Municipal securities216,744 8,776 (902)224,618 224,446 11,573 (4)236,015 
Corporate debt securities 173,061 7,477 — 180,538 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,225,285 $37,490 $(49,867)$3,212,908 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$10,853 $— $(392)$10,461 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity		(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$10,633 $— $(392)$10,241 $12,071 $— $(385)$11,686 
Equity Securities$114,848 $76,404 
Accrued interest receivable on the securities portfolio totaled $10.4 million and $11.9 million as of September 30, 2021 and December 31, 2020, respectively, and is included in accrued interest receivable and other assets in the Consolidated Statements of Financial Condition.
Accounting guidance requires that the credit portion of a decline in fair value be recognized as an allowance for credit losses, established as a charge to expense through income. If a decline in fair value below carrying value is not attributable to credit deterioration and the Company does not intend to sell the security or believe it would not be more likely than not required to sell the security prior to recovery, the Company records the non-credit related portion of the decline in fair value in other comprehensive income (loss). In determining whether a decline in fair value of a security is credit related, the Company considers adverse conditions specific to the security, deterioration in economic conditions or market environment that may affect the value of the securities and related collateral, if any, events of default, changes to the credit rating of the security by a rating agency, and guarantees applicable to the security, among other factors.
Remaining Contractual Maturity of Securities
(Dollar amounts in thousands)
 As of September 30, 2021
 Available-for-SaleHeld-to-Maturity
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
One year or less$115,656 $115,178 $1,857 $1,790 
After one year to five years157,219 156,570 4,495 4,333 
After five years to ten years792,796 789,520 1,953 1,882 
After ten years— — 2,548 2,456 
Securities that do not have a single contractual maturity date2,159,614 2,151,640 — — 
Total$3,225,285 $3,212,908 $10,853 $10,461 
The carrying value of securities available-for-sale that were pledged to secure deposits or for other purposes as permitted or required by law totaled $2.1 billion as of September 30, 2021 and $1.6 billion as of December 31, 2020. No securities held-to-maturity were pledged as of September 30, 2021 or December 31, 2020.
There were no material realized gains (losses) on securities available-for-sale for the quarters ended September 30, 2021 and the nine months ended September 30, 2021. There were $14.3 million and $13.3 million of realized gains for the quarter and nine months ended September 30, 2020.
The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of September 30, 2021 and December 31, 2020.
Securities in an Unrealized Loss Position
(Dollar amounts in thousands)
  Less Than 12 Months12 Months or LongerTotal
 Number of
Securities		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
As of September 30, 2021      
Securities Available-for-Sale
U.S. agency securities74 $331,843 $10,834 $216,769 $10,354 $548,612 $21,188 
CMOs178 666,381 13,271 139,952 7,580 806,333 20,851 
MBSs85 349,060 5,751 59,373 1,175 408,433 6,926 
Municipal securities30 21,497 742 5,824 160 27,321 902 
Total367 $1,368,781 $30,598 $421,918 $19,269 $1,790,699 $49,867 
As of December 31, 2020       
Securities Available-for-Sale
U.S. agency securities48 $253,841 $4,764 $14,932 $212 $268,773 $4,976 
CMOs104 349,853 3,205 86,618 1,118 436,471 4,323 
MBSs19 69,838 550 12,307 90 82,145 640 
Municipal securities4 1,012 4 — — 1,012 4 
Corporate debt securities3 8,100 105 9,513 165 17,613 270 
Total178 $682,644 $8,628 $123,370 $1,585 $806,014 $10,213 
Substantially all of the Company's CMOs and other MBSs are either backed by U.S. government-owned agencies or issued by U.S. government-sponsored enterprises. Municipal securities are issued by municipal authorities, and the majority are supported by third-party insurance or some other form of credit enhancement. Management does not believe any of these securities with unrealized losses as of September 30, 2021 represent impairment related to credit deterioration. These unrealized losses are attributed to changes in interest rates and temporary market movements. The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell them before recovery of their amortized cost basis, which may be at maturity.