INVESTMENT SECURITIES (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities

The following table presents the amortized cost and fair value of the investment securities portfolio as of the dates indicated:



($ in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2019
Securities available-for-sale:
SBA loan pool securities	$	831	$	—	$	(11	)	$	820
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities	448,956		18		(14,513		)	434,461
Non-agency residential mortgage-backed securities	319		12		—			331
Collateralized loan obligations	1,046,845		132		(11,286		)	1,035,691
Total securities available-for-sale	$	1,496,951	$	162	$	(25,810	)	$	1,471,303
December 31, 2018
Securities available-for-sale:
SBA loan pool securities	$	911	$	—	$	(1	)	$	910
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities	461,987		—		(24,545		)	437,442
Non-agency residential mortgage-backed securities	418		9		—			427
Non-agency commercial mortgage-backed securities	132,199		—		—			132,199
Collateralized loan obligations	1,431,171		141		(9,790		)	1,421,522
Total securities available-for-sale	$	2,026,686	$	150	$	(34,336	)	$	1,992,500

Proceeds from Sales and Calls of Securities and Associated Gross Gains and Losses

The following table presents proceeds from sales and calls of securities available-for-sale and the associated gross gains and losses realized through earnings upon the sales and calls of securities available-for-sale for the periods indicated:



	Three Months Ended March 31,
($ in thousands)	2019		2018
Gross realized gains on sales and calls of securities available-for-sale	$	208	$	5,241
Gross realized losses on sales and calls of securities available-for-sale	—		—
Net realized gains on sales and calls of securities available-for-sale	$	208	$	5,241
Proceeds from sales and calls of securities available-for-sale	$	521,684	$	287,517

Summary of Investment Securities with Unrealized Losses

The following table summarizes the investment securities with unrealized losses by security type and length of time in a continuous unrealized loss position as of the dates indicated:



	Less Than 12 Months					12 Months or Longer					Total
($ in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
March 31, 2019
Securities available-for-sale:
SBA loan pool securities	$	820	$	(11	)	$	—	$	—		$	820	$	(11	)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities	200,351		(6,653		)	230,807		(7,860		)	431,158		(14,513		)
Non-agency residential mortgage-backed securities	15		—			7		—			22		—
Collateralized loan obligations	739,508		(10,437		)	195,301		(849		)	934,809		(11,286		)
Total securities available-for-sale	$	940,694	$	(17,101	)	$	426,115	$	(8,709	)	$	1,366,809	$	(25,810	)
December 31, 2018
Securities available-for-sale:
SBA loan pool securities	$	—	$	—		$	910	$	(1	)	$	910	$	(1	)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities	13,494		(133		)	423,916		(24,412		)	437,410		(24,545		)
Non-agency residential mortgage-backed securities	90		—			16		—			106		—
Collateralized loan obligations	1,364,317		(9,480		)	32,790		(310		)	1,397,107		(9,790		)
Total securities available-for-sale	$	1,377,901	$	(9,613	)	$	457,632	$	(24,723	)	$	1,835,533	$	(34,336	)

Composition, Repricing and Yield Information of Investment Securities Portfolio

The following table presents the composition and the repricing and yield information of the investment securities portfolio as of March 31, 2019:



	One year or less				More than One Year through Five Years				More than Five Years through Ten Years				More than Ten Years				Total
($ in thousands)	Fair Value		Weighted-Average Yield		Fair Value		Weighted-Average Yield		Fair Value		Weighted-Average Yield		Fair Value		Weighted-Average Yield		Fair Value		Weighted-Average Yield
Securities available-for-sale:
SBA loan pool securities	$	—	—	%	$	—	—	%	$	—	—	%	$	820	3.06	%	$	820	3.06	%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities	267		2.71	%	3,317		3.16	%	—		—	%	430,877		3.06	%	434,461		3.03	%
Non-agency residential mortgage-backed securities	76		3.96	%	—		—	%	—		—	%	255		5.57	%	331		5.20	%
Collateralized loan obligations	1,035,691		4.25	%	—		—	%	—		—	%	—		—	%	1,035,691		4.25	%
Total securities available-for-sale	$	1,036,034	4.25	%	$	3,317	3.16	%	$	—	—	%	$	431,952	3.03	%	$	1,471,303	3.89	%