Loans (Schedule of Acquired Impaired Loans, Accretable Yield and Carrying Amount) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Covered impaired loan
Accretable Yield
Balance at beginning of period	$ 26,150	$ 37,511	$ 53,655	$ 37,511	$ 67,282
Accretion	(2,893)		(9,683)	(12,560)	(34,438)
Net reclassifications from nonaccretable to accretable	1,785		8,684	3,865	20,290
Disposals	(329)		(711)	(4,103)	(1,189)
Balance at end of period	24,713		51,945	24,713	51,945
Movement In Mortgage Loans On Real Estate Roll Forward
Balance at beginning of period	157,808	232,452	316,481	232,452	403,692
Accretion	2,893		9,683	12,560	34,438
Payments received, net	(18,069)		(41,598)	(102,380)	(153,564)
Balance at end of period	142,632		284,566	142,632	284,566
Acquired Impaired Loans
Accretable Yield
Balance at beginning of period	112,031	119,450	137,442	119,450	136,646
Accretion	(9,924)		12,950	31,427	37,437
Net reclassifications from nonaccretable to accretable	6,780	27,992	6,646		36,659
Disposals	(4,600)		4,714	11,728	9,444
Balance at end of period	104,287		126,424	104,287	126,424
Movement In Mortgage Loans On Real Estate Roll Forward
Balance at beginning of period	356,164	$ 423,209	519,250	423,209	601,000
Accretion	9,924		12,950	31,427	37,437
Payments received, net	(38,840)		53,150	127,388	159,387
Balance at end of period	$ 327,248		$ 479,050	$ 327,248	$ 479,050