Investment Securities Held-to-Maturity (Tables)

6 Months Ended

Jun. 30, 2016

Text Block [Abstract]

Summary of Held-to-Maturity Securities

	June 30, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
U.S. Government Sponsored Enterprises	$	190,026	$	3,240	$	1	$	193,265	$	186,734	$	2,234	$	141	$	188,827
SBA Backed Securities		20,987		155		—		21,142		—		—		—		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		1,362,816		30,164		629		1,392,351		1,252,169		7,547		9,583		1,250,133
Total	$	1,573,829	$	33,559	$	630	$	1,606,758	$	1,438,903	$	9,781	$	9,724	$	1,438,960

Company's Securities Held-to-Maturity

The following table shows the maturity distribution of the Company’s securities held-to-maturity at June 30, 2016.

	Amortized Cost		Fair Value
	(in thousands)
Within one year	$	10,047	$	10,137
After one but within five years		1,400,716		1,427,594
After five but within ten years		159,917		165,817
More than ten years		3,149		3,210
Total	$	1,573,829	$	1,606,758

Unrealized Market Loss of Securities

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at June 30, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months or longer. There are 6 and 16 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 352 holdings at June 30, 2016.

	June 30, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(in thousands)
U.S. Government Sponsored Enterprises	$	14,999	$	1	$	—	$	—	$	14,999	$	1
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		23,087		93		70,461		536		93,548		629
Total temporarily impaired securities	$	38,086	$	94	$	70,461	$	536	$	108,547	$	630

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for less than 12 months and a continuous loss position for 12 months or longer. There are 101 and 26 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 322 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(in thousands)
U.S. Government Sponsored Enterprises	$	9,859	$	141	$	—	$	—	$	9,859	$	141
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		626,218		6,657		123,864		2,926		750,082		9,583
Total temporarily impaired securities	$	636,077	$	6,798	$	123,864	$	2,926	$	759,941	$	9,724