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 2018 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 March 31, 2019									As of December 31, 2018
	Amortized Cost		Gross Unrealized					Fair Value		Amortized Cost		Gross Unrealized					Fair Value
	Amortized Cost		Gains		Losses			Fair Value		Amortized Cost		Gains		Losses			Fair Value
Securities Available-for-Sale
U.S. treasury securities	$	40,938	$	47	$	(93	)	$	40,892	$	37,925	$	17	$	(175	)	$	37,767
U.S. agency securities	129,486		93		(1,258		)	128,321		144,125		45		(1,607		)	142,563
Collateralized mortgage obligations ("CMOs")	1,365,007		6,107		(14,084		)	1,357,030		1,336,531		3,362		(24,684		)	1,315,209
Other mortgage-backed securities ("MBSs")	491,689		1,651		(6,314		)	487,026		477,665		520		(11,251		)	466,934
Municipal securities	231,790		2,289		(603		)	233,476		229,600		461		(2,874		)	227,187
Corporate debt securities	104,444		360		(1,354		)	103,450		86,074		—		(3,725		)	82,349
Total securities available-for-sale	$	2,363,354	$	10,547	$	(23,706	)	$	2,350,195	$	2,311,920	$	4,405	$	(44,316	)	$	2,272,009
Securities Held-to-Maturity
Municipal securities	$	12,842	$	—	$	(187	)	$	12,655	$	10,176	$	—	$	(305	)	$	9,871
Equity Securities								$	33,304								$	30,806

Remaining Contractual Maturity of Securities

(Dollar amounts in thousands)



	As of March 31, 2019
	Available-for-Sale				Held-to-Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	118,322	$	118,201	$	10,336	$	10,186
After one year to five years	156,648		156,488		2,190		2,158
After five years to ten years	231,688		231,450		316		311
After ten years	—		—		—		—
Securities that do not have a single contractual maturity date	1,856,696		1,844,056		—		—
Total	$	2,363,354	$	2,350,195	$	12,842	$	12,655

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 $1.3 billion as of March 31, 2019 and $1.2 billion as of December 31, 2018. No securities held-to-maturity were pledged as of March 31, 2019 or December 31, 2018.

During the quarters ended March 31, 2019 and 2018 there were no realized gains on securities available-for-sale.

Accounting guidance requires that the credit portion of an OTTI charge be recognized 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).

There was no outstanding balance of OTTI previously recognized on securities available-for-sale as of either March 31, 2019 or December 31, 2018. During the quarters ended March 31, 2019 and 2018 no OTTI was recognized on securities available-for-sale.

The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of March 31, 2019 and December 31, 2018.

Securities in an Unrealized Loss Position

(Dollar amounts in thousands)



		Less Than 12 Months				12 Months or Longer				Total
	Number of Securities	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
As of March 31, 2019
Securities Available-for-Sale
U.S. treasury securities	12	$	4,987	$	1	$	19,902	$	92	$	24,889	$	93
U.S. agency securities	64	20,991		212		90,081		1,046		111,072		1,258
CMOs	221	27,366		21		904,014		14,063		931,380		14,084
MBSs	101	16,064		36		347,006		6,278		363,070		6,314
Municipal securities	188	123		—		84,305		603		84,428		603
Corporate debt securities	16	52,947		653		31,782		701		84,729		1,354
Total	602	$	122,478	$	923	$	1,477,090	$	22,783	$	1,599,568	$	23,706
Securities Held-to-Maturity
Municipal securities	6	$	—	$	—	$	12,655	$	187	$	12,655	$	187
As of December 31, 2018
Securities Available-for-Sale
U.S. treasury securities	17	$	15,894	$	57	$	13,886	$	118	$	29,780	$	175
U.S. agency securities	74	34,263		320		93,227		1,287		127,490		1,607
CMOs	234	171,901		1,671		863,747		23,013		1,035,648		24,684
MBSs	118	135,791		1,715		284,273		9,536		420,064		11,251
Municipal securities	423	60,863		558		109,935		2,316		170,798		2,874
Corporate debt securities	16	82,349		3,725		—		—		82,349		3,725
Total	882	$	501,061	$	8,046	$	1,365,068	$	36,270	$	1,866,129	$	44,316
Securities Held-to-Maturity
Municipal securities	5	$	—	$	—	$	9,871	$	305	$	9,871	$	305

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 March 31, 2019 represent OTTI 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.