Securities (Tables)

12 Months Ended

Dec. 31, 2016

Investments Debt And Equity Securities [Abstract]

Summary of AFS Securities Portfolio

The following table provides a summary of the Company’s AFS securities portfolio at December 31:

		Amortized Cost		Gross Unrealized					Estimated Fair Value
(dollars in thousands)				Gains		Losses
2016:
US Treasury securities	$	300	$	—	$	(3	)	$	297
Agency mortgage-backed securities		476,163		160		(7,414	)		468,909
Beneficial interest – FHLMC securitization		42,028		711		(2,367	)		40,372
Total	$	518,491	$	871	$	(9,784	)	$	509,578
2015:
US Treasury securities	$	300	$	—	$	—		$	300
Agency notes		16,108		—		(95	)		16,013
Agency mortgage-backed securities		538,269		909		(3,030	)		536,148
Beneficial interest – FHLMC securitization		12,674		476		(476	)		12,674
Total	$	567,351	$	1,385	$	(3,601	)	$	565,135

Schedule of Securities in a Continuous Unrealized Loss Position Aggregated by Investment Category and Length of Time

The table below indicates, as of December 31, 2016, the gross unrealized losses and fair values of our investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position.

	Securities with Unrealized Loss at December 31, 2016
(dollars in thousands)	Less than 12 months					12 months or more				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
US Treasury securities		297		(3	)		—		—		297		(3	)
Agency mortgage backed securities		445,591		(7,414	)		—		—		445,591		(7,414	)
Beneficial interest – FHLMC securitization		18,636		(2,367	)		—		—		18,636		(2,367	)
Total temporarily impaired securities	$	464,524	$	(9,784	)	$	—	$	—	$	464,524	$	(9,784	)

Scheduled Maturities of Securities AFS Other than Mortgage Backed Securities and the Related Weighted Average Yield

The scheduled maturities of securities AFS, other than agency mortgage backed securities, and the related weighted average yield is as follows as of December 31, 2016:

(dollars in thousands)	Less than  1 Year			1 Through  5 years			5 Through  10 Years			After 10 Years			Total
Amortized Cost:
US Treasury securities	$	—		$	300		$	—		$	—		$	300
Weighted average yield		—	%		0.90	%		—	%		—	%		0.90	%
Estimated Fair Value:
US Treasury securities	$	—		$	297		$	—		$	—		$	297
Total	$	—		$	297		$	—		$	—		$	297