Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investment Securities

Schedule of amortized cost and fair values of investment securities

	Amortized		Gross Unrealized					Estimated
(Dollars in thousands)	Cost		Gains		Losses			Fair Value
June 30, 2015:
Held to maturity:
U.S. government-sponsored mortgage-backed securities	$	524,840	$	12,061	$	(7,633	)	$	529,268
Trust preferred securities	868		—		—			868
Total	$	525,708	$	12,061	$	(7,633	)	$	530,136
December 31, 2014:
Held to maturity:
U.S. government-sponsored mortgage-backed securities	$	572,232	$	18,078	$	(4,290	)	$	586,020
Trust preferred securities	690		—		—			690
Total	$	572,922	$	18,078	$	(4,290	)	$	586,710

Schedule of carrying and estimated fair value of investment securities by contractual maturity

	Amortized		Estimated
(Dollars in thousands)	Cost		Fair Value
Held to maturity:
Due within 5 years	$	41	$	43
Due after 5 years through 10 years	8		9
Due after 10 years	525,659		530,084
Total	$	525,708	$	530,136

Schedule of realized gains and losses and proceeds from sales of securities available for sale, held to maturity and trading

	Three Months Ended June 30,				Six Months Ended June 30,
(Dollars in thousands)	2015		2014		2015		2014
Proceeds from sales	$	2,503	$	3,475	$	5,083	$	12,270
Gross gains	240		309		476		655
Gross losses	—		—		—		—

Summary of investment securities which were in unrealized loss position

	Less Than 12 Months				12 Months or Longer				Total
			Unrealized				Unrealized		Number of			Unrealized
Description of Securities	Fair Value		Losses		Fair Value		Losses		Securities	Fair Value		Losses
(Dollars in thousands)
June 30, 2015:
Mortgage-backed securities	$	166,679	$	5,022	$	54,835	$	2,611	45	$	221,514	$	7,633
December 31, 2014:
Mortgage-backed securities	$	12,717	$	65	$	183,349	$	4,225	37	$	196,066	$	4,290

Cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold

(Dollars in thousands)	2015			2014
Balance at January 1,	$	5,885		$	5,885
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	—			—
Credit losses on debt securities which were sold	(3,482		)	—
Balance at June 30,	$	2,403		$	5,885

Comprehensive loss

Schedule of components of accumulated other comprehensive loss, net of taxes

(Dollars in thousands)	Unfunded Pension Liability		Noncredit Related Loss on Trust Preferred Securities			Unrealized Loss on Securities			Total
Three months ended June 30, 2015
Balances at beginning of period	$	5,032	$	253		$	63		$	5,348
Other comprehensive income, net of taxes	64		(77		)	(7		)	(20		)
Amounts reclassified from accumulated other comprehensive loss	—		—			—			—
Net current period other comprehensive income	64		(77		)	(7		)	(20		)
Balances at end of period	$	5,096	$	176		$	56		$	5,328
Three months ended June 30, 2014
Balances at beginning of period	$	3,338	$	304		$	70		$	3,712
Other comprehensive income, net of taxes	—		—			(1		)	(1		)
Amounts reclassified from accumulated other comprehensive loss	—		—			—			—
Net current period other comprehensive income	—		—			(1		)	(1		)
Balances at end of period	$	3,338	$	304		$	69		$	3,711
Six months ended June 30, 2015
Balances at beginning of period	$	5,032	$	284		$	72		$	5,388
Other comprehensive income, net of taxes	64		(108		)	(16		)	(60		)
Amounts reclassified from accumulated other comprehensive loss	—		—			—			—
Net current period other comprehensive income	64		(108		)	(16		)	(60		)
Balances at end of period	$	5,096	$	176		$	56		$	5,328
Six months ended June 30, 2014
Balances at beginning of period	$	3,338	$	376		$	73		$	3,787
Other comprehensive income, net of taxes	—		(72		)	(4		)	(76		)
Amounts reclassified from accumulated other comprehensive loss	—		—			—			—
Net current period other comprehensive income	—		(72		)	(4		)	(76		)
Balances at end of period	$	3,338	$	304		$	69		$	3,711

Noncredit Related Loss

Comprehensive loss

Schedule of components of accumulated other comprehensive loss, net of taxes

	June 30,
(Dollars in thousands)	2015		2014
Noncredit losses on other-than-temporarily impaired securities, net of taxes	$	176	$	304