Shareholder's Equity (Tables)

12 Months Ended

Dec. 31, 2012

Shareholders' Equity [Abstract]

Other comprehensive income (loss) components and related tax effects

	As of December 31,
	2012			2011			2010
	(Dollars in thousands)
Unrealized holding gain (loss) on securities available for sale	$	8,827		$	19,044		$	527
Reclassification adjustment for gains realized in income		(6,325	)		(8,633	)		(8,803	)
Reclassification adjustment for prior OTTI charges		13			89			58
Net unrealized gains (losses)		2,515			10,500			(8,218	)
Tax effect (35%)		(880	)		—			—
Net-of-tax amount		1,635			10,500			(8,218	)
Net loss (gain) on employee pension plan		(170	)		(79	)		(671	)
Prior service cost (credit)		193			(689	)		—
Amortization of prior service cost		—			78			1
		23			(690	)		(670	)
Tax effect		(8	)		—			—
Net of tax amount		15			(690	)		(670
	$	1,650		$	9,810		$	(8,888	)

Summary of accumulated other comprehensive income (loss) balances, net of tax

	Balance at December 31, 2011		Current Period Change		Balance at December 31, 2012
	(Dollars in thousands)
Unrealized gains on securities available for sale	$	3,447	$	1,635	$	5,082
Unrealized gains on postretirement benefits		1,585		15		1,600
Total	$	5,032	$	1,650	$	6,682