Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Amortized cost and fair value of investments classified as available-for-sale

	March 31, 2015
(Dollar amounts in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Government agencies	$	1,300	$	65	$	—		$	1,365
Mortgage Backed Securities - Residential	174,682		7,817		(214		)	182,285
Mortgage Backed Securities - Commercial	16		—		—			16
Collateralized Mortgage Obligations	496,720		4,686		(3,345		)	498,061
State and Municipal Obligations	199,789		9,645		(128		)	209,306
Collateralized Debt Obligations	9,956		5,353		(1		)	15,308
TOTAL	$	882,463	$	27,566	$	(3,688	)	$	906,341

	December 31, 2014
(Dollar amounts in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Government agencies	$	1,411	$	56	$	—		$	1,467
Mortgage Backed Securities-residential	180,673		7,593		(330		)	187,936
Mortgage Backed Securities-commercial	17		—		—			17
Collateralized mortgage obligations	489,765		2,513		(7,623		)	484,655
State and municipal	198,875		9,019		(219		)	207,675
Collateralized debt obligations	10,205		5,115		(17		)	15,303
TOTAL	$	880,946	$	24,296	$	(8,189	)	$	897,053

Schedule of contractual maturities of debt securities

Contractual maturities of debt securities at March 31, 2015 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and equity securities are shown separately.

	Available-for-Sale
	Amortized		Fair
(Dollar amounts in thousands)	Cost		Value
Due in one year or less	$	4,157	$	4,214
Due after one but within five years	38,385		39,879
Due after five but within ten years	89,483		94,057
Due after ten years	79,020		87,829
	211,045		225,979
Mortgage-backed securities and collateralized mortgage obligations	671,418		680,362
TOTAL	$	882,463	$	906,341

Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position

The following tables show the securities’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at March 31, 2015 and December 31, 2014. 

	March 31, 2015
	Less Than 12 Months					More Than 12 Months							Total
			Unrealized					Unrealized					Unrealized
(Dollar amounts in thousands)	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
Mortgage Backed Securities - Residential	$	19,794	$	(194	)	$	3,421	$	(20	)	$	23,215	$	(214	)
Collateralized mortgage obligations	186,094		(3,206		)	31,413		(139		)	217,507		(3,345		)
State and municipal obligations	4,430		(72		)	7,395		(56		)	11,825		(128		)
Collateralized Debt Obligations	—		—			56		(1		)	56		(1		)
Total temporarily impaired securities	$	210,318	$	(3,472	)	$	42,285	$	(216	)	$	252,603	$	(3,688	)

	December 31, 2014
	Less Than 12 Months					More Than 12 Months							Total
			Unrealized					Unrealized					Unrealized
(Dollar amounts in thousands)	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
Mortgage Backed Securities - Residential	$	—	$	—		$	23,849	$	(330	)	$	23,849	$	(330	)
Collateralized mortgage obligations	50,832		(128		)	264,940		(7,495		)	315,772		(7,623		)
State and municipal obligations	6,500		(35		)	10,547		(184		)	17,047		(219		)
Collateralized Debt Obligations	—		—			200		(17		)	200		(17		)
Total temporarily impaired securities	$	57,332	$	(163	)	$	299,536	$	(8,026	)	$	356,868	$	(8,189	)

Rollforward of the credit losses recognized in earnings

The table below presents a rollforward of the credit losses recognized in earnings for the three month periods ended March 31, 2015 and 2014:

	Three Months Ended March 31,
(Dollar amounts in thousands)	2015			2014
Beginning balance	$	14,050		$	14,079
Increases to the amount related to the credit
Loss for which other-than-temporary was previously recognized	—			—
Reductions for increases in cash flows collected	(55		)	—
Amounts realized for securities sold during the period	—			—
Ending balance	$	13,995		$	14,079