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Securities
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Securities SECURITIES
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 December 31,
 20202019
 Amortized
Cost		Gross UnrealizedFair
Value		Amortized
Cost		Gross UnrealizedFair
Value
 GainsLossesGainsLosses
Securities Available-for-Sale       
U.S. treasury securities$12,001 $50 $— $12,051 $33,939 $137 $(1)$34,075 
U.S. agency securities654,321 3,129 (4,976)652,474 249,502 758 (1,836)248,424 
Collateralized mortgage
obligations ("CMOs")		1,415,312 27,529 (4,323)1,438,518 1,547,805 14,893 (5,027)1,557,671 
Other mortgage-backed
securities ("MBSs")		566,830 14,650 (640)580,840 678,804 7,728 (1,848)684,684 
Municipal securities224,446 11,573 (4)236,015 228,632 5,898 (99)234,431 
Corporate debt securities170,570 6,210 (270)176,510 112,797 1,791 (487)114,101 
Total securities
available-for-sale		$3,043,480 $63,141 $(10,213)$3,096,408 $2,851,479 $31,205 $(9,298)$2,873,386 
Securities Held-to-Maturity       
Municipal securities$12,291 $— $(385)$11,906 
Allowance for securities
  held-to-maturity(1)
(220)(220)
Total for securities held-
to-maturity, net		$12,071 $— $(385)$11,686 $21,997 $— $(763)$21,234 
Equity Securities$76,404 $42,136 

(1)The allowance for securities held-to-maturity was established upon adoption of CECL on January 1, 2020
Accrued interest receivable on the securities portfolio totaled $11.9 million and $11.3 million as of December 31, 2020 and December 31, 2019, 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 December 31, 2020
 Available-for-SaleHeld-to-Maturity
 
Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
One year or less$322,490 $327,264 $845 $818 
After one year to five years205,469 208,511 4,392 4,252 
After five years to ten years533,379 541,275 1,412 1,367 
After ten years— — 5,422 5,249 
Securities that do not have a single contractual maturity date1,982,142 2,019,358 — — 
Total$3,043,480 $3,096,408 $12,071 $11,686 
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 $1.6 billion for December 31, 2020 and $1.3 billion for December 31, 2019. No securities held-to-maturity were pledged as of December 31, 2020 or 2019.
Excluding securities issued or backed by the U.S. government and its agencies and U.S. government-sponsored enterprises, there were no investments in securities from one issuer that exceeded 10% of total stockholders' equity as of December 31, 2020 or 2019.
There were realized net gains of $13.3 million on securities available-for-sale for the year ended December 31, 2020, on sales of $268.5 million of securities. There were no net securities gains (losses) recognized during the years ended December 31, 2019 and 2018. Certain securities acquired in the Bridgeview and Northern States transactions were sold shortly after the acquisition date, resulting in no gains or losses as they were recorded at fair value upon acquisition.
The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of December 31, 2020 and 2019.
Securities in an Unrealized Loss Position
(Dollar amounts in thousands)
  Less Than 12 MonthsGreater Than 12 MonthsTotal
 
Number of
Securities
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
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 
As of December 31, 2019       
Securities Available-for-Sale
U.S. treasury securities5 $4,966 $1 $— $— $4,966 $1 
U.S. agency securities52 97,729 1,200 49,387 636 147,116 1,836 
CMOs148 187,470 2,177 412,083 2,850 599,553 5,027 
MBSs59 66,340 996 121,861 852 188,201 1,848 
Municipal securities16 9,384 89 3,104 10 12,488 99 
Corporate debt securities6 9,719 281 21,955 206 31,674 487 
Total286 $375,608 $4,744 $608,390 $4,554 $983,998 $9,298 
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 December 31, 2020 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.