Securities (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

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

	March 31, 2014
(Dollar amounts in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Government agencies	$	1,531	$	28	$	—		$	1,559
Mortgage Backed Securities - Residential	188,755		7,580		(1,613		)	194,722
Mortgage Backed Securities - Commercial	26		1		—			27
Collateralized Mortgage Obligations	528,654		1,648		(13,364		)	516,938
State and Municipal Obligations	189,302		7,189		(1,080		)	195,411
Collateralized Debt Obligations	10,645		5,309		(3,446		)	12,508
TOTAL	$	918,913	$	21,755	$	(19,503	)	$	921,165

	December 31, 2013
(Dollar amounts in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Government agencies	$	1,623	$	10	$	—		$	1,633
Mortgage Backed Securities-residential	191,995		7,761		(1,992		)	197,764
Mortgage Backed Securities-commercial	4,642		1		(252		)	4,391
Collateralized mortgage obligations	521,148		1,492		(15,899		)	506,741
State and municipal	190,521		6,388		(1,922		)	194,987
Collateralized debt obligations	10,968		4,695		(6,619		)	9,044
TOTAL	$	920,897	$	20,347	$	(26,684	)	$	914,560

Schedule of contractual maturities of debt securities

Contractual maturities of debt securities at March 31, 2014 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	$	8,625	$	8,795
Due after one but within five years	34,530		36,064
Due after five but within ten years	88,184		91,103
Due after ten years	598,793		590,454
	730,132		726,416
Mortgage-backed securities	188,781		194,749
TOTAL	$	918,913	$	921,165

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, 2014 and December 31, 2013. 

	March 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	$	53,648	$	(1,136	)	$	10,239	$	(477	)	$	63,887	$	(1,613	)
Collateralized mortgage obligations	373,753		(10,336		)	56,666		(3,028		)	430,419		(13,364		)
State and municipal obligations	34,312		(877		)	3,458		(203		)	37,770		(1,080		)
Collateralized Debt Obligations	—		—			6,573		(3,446		)	6,573		(3,446		)
Total temporarily impaired securities	$	461,713	$	(12,349	)	$	76,936	$	(7,154	)	$	538,649	$	(19,503	)

	December 31, 2013
	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	$	52,524	$	(1,645	)	$	6,022	$	(347	)	$	58,546	$	(1,992	)
Mortgage Backed Securities - Commercial	—		—			4,357		(252		)	4,357		(252		)
Collateralized mortgage obligations	406,291		(13,979		)	29,588		(1,920		)	435,879		(15,899		)
State and municipal obligations	43,899		(1,746		)	2,305		(176		)	46,204		(1,922		)
Collateralized Debt Obligations	—		—			3,686		(6,619		)	3,686		(6,619		)
Total temporarily impaired securities	$	502,714	$	(17,370	)	$	45,958	$	(9,314	)	$	548,672	$	(26,684	)

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, 2014 and 2013:

	Three Months Ended March 31,
(Dollar amounts in thousands)	2014		2013
Beginning balance	$	14,079	$	14,983
Increases to the amount related to the credit
Loss for which other-than-temporary was previously recognized	—		—
Reductions for increases in cash flows collected	—		—
Amounts realized for securities sold during the period	—		—
Ending balance	$	14,079	$	14,983