Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair value of financial assets and liabilities measured on recurring basis

	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(Dollars in thousands)
June 30, 2012
Securities available for sale	$	—	$	544,813	$	10,487	$	555,300
Derivative assets		—		7,652		—		7,652
Derivative liabilities		—		5,648		—		5,648
Loans held for sale		—		16,612		—		16,612
Mortgage servicing intangibles		—		—		915		915
June 30, 2011
Securities available for sale	$	35,096	$	506,811	$	12,498	$	554,405
Derivative assets		—		6,663		—		6,663
Derivative liabilities		—		5,136		—		5,136
Loans held for sale		—		11,258		—		11,258
Mortgage servicing intangibles		—		—		—		—

Changes in level 3 assets measured at estimated fair value on a recurring basis

	Six Months Ended June 30,
	2012			2011
	(Dollars in thousands)
Balance at the beginning of the year	$	13,225		$	10,837
Purchases, issuances and settlements		1,770			—
Sales		(534	)		(189	)
(Losses) gains included in earnings		(596	)		20
Total unrealized (losses) gains		(2,463	)		1,830
Balance at the end of the period	$	11,402		$	12,498

Assets measured at fair value on a nonrecurring basis

	Level 1		Level 2		Level 3		Total Fair Value		Gains (Losses)
	(Dollars in thousands)
Six Months Ended June 30, 2012
Impaired loans		—		—	$	43,125	$	43,125	$	—
Foreclosed assets		—		—	$	135	$	135	$	(86	)
Other real estate owned		—		—	$	10,088	$	10,088	$	(1,067	)
Six Months Ended June 30, 2011
Impaired loans		—		—	$	19,281	$	19,281	$	—
Foreclosed assets		—		—	$	510	$	510	$	1
Other real estate owned		—		—	$	14,991	$	14,991	$	291

Estimated fair values of company's financial instruments

	June 30,
	2012					2011
	Carrying Amount			Fair Value		Carrying Amount			Fair Value
	(Dollars in thousands)
FINANCIAL ASSETS
Cash and cash equivalents	$	1,763,908		$	1,763,908	$	1,571,199		$	1,571,199
Securities held for investment		19,734			20,104		25,654			26,225
Loans:
Loans (net of unearned interest)		3,065,439					2,861,844
Allowance for loan losses		(37,436	)				(37,092	)
Loans, net		3,028,003			3,092,725		2,824,752			2,843,098
FINANCIAL LIABILITIES
Deposits		5,099,648			5,121,335		4,701,999			4,732,880
Short-term borrowings		6,340			6,340		1,400			1,400
Long-term borrowings		11,329			11,431		32,121			32,620
Junior subordinated debentures		26,804			28,970		28,866			31,997
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments					1,321					1,058
Letters of credit					428					441