Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 35,786,000		$ 35,786,000		$ 65,256,000
Recorded Investment, With allowance recorded	273,558,000		273,558,000		376,892,000
Recorded Investment	309,344,000		309,344,000		442,148,000
Unpaid Principal Balance, With no related allowance recorded	79,194,000		79,194,000		125,470,000
Unpaid Principal Balance, With allowance recorded	276,712,000		276,712,000		380,036,000
Unpaid Principal Balance	355,906,000		355,906,000		505,506,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	31,441,000		31,441,000		33,476,000
Related Allowance	31,441,000		31,441,000		33,476,000
Average Recorded Investment, With no related allowance recorded	46,110,000		55,312,000		90,590,000
Average Recorded Investment, With allowance recorded	277,376,000		320,159,000		531,456,000
Average Recorded Investment	323,486,000	$ 559,700,000	375,471,000	$ 666,800,000	622,046,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	2,193,000		7,333,000		14,861,000
Interest Income Recognized	2,193,000		7,333,000	$ 0	14,861,000
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,030,000		1,030,000		0
Recorded Investment, With allowance recorded	9,809,000		9,809,000		4,848,000
Recorded Investment	10,839,000		10,839,000		4,848,000
Unpaid Principal Balance, With no related allowance recorded	1,030,000		1,030,000		0
Unpaid Principal Balance, With allowance recorded	9,809,000		9,809,000		4,848,000
Unpaid Principal Balance	10,839,000		10,839,000		4,848,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	155,000		155,000		129,000
Related Allowance	155,000		155,000		129,000
Average Recorded Investment, With no related allowance recorded	1,145,000		421,000		0
Average Recorded Investment, With allowance recorded	9,573,000		7,880,000		3,604,000
Average Recorded Investment	10,718,000		8,301,000		3,604,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	104,000		226,000		1,405,000
Interest Income Recognized	104,000		226,000		1,405,000
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	837,000		837,000		995,000
Recorded Investment, With allowance recorded	23,270,000		23,270,000		33,450,000
Recorded Investment	24,107,000		24,107,000		34,445,000
Unpaid Principal Balance, With no related allowance recorded	2,065,000		2,065,000		2,065,000
Unpaid Principal Balance, With allowance recorded	23,270,000		23,270,000		33,450,000
Unpaid Principal Balance	25,335,000		25,335,000		35,515,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	555,000		555,000		1,040,000
Related Allowance	555,000		555,000		1,040,000
Average Recorded Investment, With no related allowance recorded	1,030,000		1,053,000		1,352,000
Average Recorded Investment, With allowance recorded	24,007,000		27,309,000		39,427,000
Average Recorded Investment	25,037,000		28,362,000		40,779,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	295,000		955,000		115,000
Interest Income Recognized	295,000		955,000		115,000
Credit Card Receivable [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0		0
Recorded Investment, With allowance recorded	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With allowance recorded	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	0		0		0
Related Allowance	0		0		0
Average Recorded Investment, With no related allowance recorded	0		0		0
Average Recorded Investment, With allowance recorded	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	0		0		0
Interest Income Recognized	0		0		0
Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0		0
Recorded Investment, With allowance recorded	4,912,000		4,912,000		5,293,000
Recorded Investment	4,912,000		4,912,000		5,293,000
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With allowance recorded	4,912,000		4,912,000		5,293,000
Unpaid Principal Balance	4,912,000		4,912,000		5,293,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	72,000		72,000		101,000
Related Allowance	72,000		72,000		101,000
Average Recorded Investment, With no related allowance recorded	0		0		0
Average Recorded Investment, With allowance recorded	5,064,000		5,213,000		4,997,000
Average Recorded Investment	5,064,000		5,213,000		4,997,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	81,000		248,000		315,000
Interest Income Recognized	81,000		248,000		315,000
Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	8,087,000		8,087,000		15,368,000
Recorded Investment, With allowance recorded	56,882,000		56,882,000		81,758,000
Recorded Investment	64,969,000		64,969,000		97,126,000
Unpaid Principal Balance, With no related allowance recorded	10,715,000		10,715,000		20,237,000
Unpaid Principal Balance, With allowance recorded	56,882,000		56,882,000		83,963,000
Unpaid Principal Balance	67,597,000		67,597,000		104,200,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	9,893,000		9,893,000		5,413,000
Related Allowance	9,893,000		9,893,000		5,413,000
Average Recorded Investment, With no related allowance recorded	8,343,000		12,301,000		25,311,000
Average Recorded Investment, With allowance recorded	66,726,000		77,466,000		129,289,000
Average Recorded Investment	75,069,000		89,767,000		154,600,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	475,000		1,722,000		3,690,000
Interest Income Recognized	475,000		1,722,000		3,690,000
1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,327,000		2,327,000		2,981,000
Recorded Investment, With allowance recorded	56,191,000		56,191,000		80,625,000
Recorded Investment	58,518,000		58,518,000		83,606,000
Unpaid Principal Balance, With no related allowance recorded	6,378,000		6,378,000		10,520,000
Unpaid Principal Balance, With allowance recorded	56,978,000		56,978,000		81,357,000
Unpaid Principal Balance	63,356,000		63,356,000		91,877,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	5,622,000		5,622,000		11,442,000
Related Allowance	5,622,000		5,622,000		11,442,000
Average Recorded Investment, With no related allowance recorded	2,262,000		2,544,000		5,441,000
Average Recorded Investment, With allowance recorded	57,956,000		63,889,000		94,773,000
Average Recorded Investment	60,218,000		66,433,000		100,214,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	423,000		1,230,000		2,645,000
Interest Income Recognized	423,000		1,230,000		2,645,000
Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	10,238,000		10,238,000		21,504,000
Recorded Investment, With allowance recorded	25,857,000		25,857,000		49,300,000
Recorded Investment	36,095,000		36,095,000		70,804,000
Unpaid Principal Balance, With no related allowance recorded	40,401,000		40,401,000		61,843,000
Unpaid Principal Balance, With allowance recorded	26,588,000		26,588,000		49,483,000
Unpaid Principal Balance	66,989,000		66,989,000		111,326,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	2,576,000		2,576,000		4,900,000
Related Allowance	2,576,000		2,576,000		4,900,000
Average Recorded Investment, With no related allowance recorded	11,001,000		16,034,000		29,954,000
Average Recorded Investment, With allowance recorded	27,338,000		37,502,000		89,195,000
Average Recorded Investment	38,339,000		53,536,000		119,149,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	198,000		746,000		1,689,000
Interest Income Recognized	198,000		746,000		1,689,000
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	20,652,000		20,652,000		39,853,000
Recorded Investment, With allowance recorded	138,930,000		138,930,000		211,683,000
Recorded Investment	159,582,000		159,582,000		251,536,000
Unpaid Principal Balance, With no related allowance recorded	57,494,000		57,494,000		92,600,000
Unpaid Principal Balance, With allowance recorded	140,448,000		140,448,000		214,803,000
Unpaid Principal Balance	197,942,000		197,942,000		307,403,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	18,091,000		18,091,000		21,755,000
Related Allowance	18,091,000		18,091,000		21,755,000
Average Recorded Investment, With no related allowance recorded	21,606,000		30,879,000		60,706,000
Average Recorded Investment, With allowance recorded	152,020,000		178,857,000		313,257,000
Average Recorded Investment	173,626,000		209,736,000		373,963,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	1,096,000		3,698,000		8,024,000
Interest Income Recognized	1,096,000		3,698,000		8,024,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,326,000		6,326,000		7,391,000
Recorded Investment, With allowance recorded	45,172,000		45,172,000		59,035,000
Recorded Investment	51,498,000		51,498,000		66,426,000
Unpaid Principal Balance, With no related allowance recorded	9,656,000		9,656,000		11,193,000
Unpaid Principal Balance, With allowance recorded	46,678,000		46,678,000		59,041,000
Unpaid Principal Balance	56,334,000		56,334,000		70,234,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	10,437,000		10,437,000		7,597,000
Related Allowance	10,437,000		10,437,000		7,597,000
Average Recorded Investment, With no related allowance recorded	7,242,000		5,976,000		8,984,000
Average Recorded Investment, With allowance recorded	36,225,000		43,821,000		91,221,000
Average Recorded Investment	43,467,000		49,797,000		100,205,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	191,000		828,000		2,392,000
Interest Income Recognized	191,000		828,000		2,392,000
Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,941,000		6,941,000		17,017,000
Recorded Investment, With allowance recorded	51,465,000		51,465,000		62,583,000
Recorded Investment	58,406,000		58,406,000		79,600,000
Unpaid Principal Balance, With no related allowance recorded	8,949,000		8,949,000		19,612,000
Unpaid Principal Balance, With allowance recorded	51,595,000		51,595,000		62,601,000
Unpaid Principal Balance	60,544,000		60,544,000		82,213,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	2,131,000		2,131,000		2,854,000
Related Allowance	2,131,000		2,131,000		2,854,000
Average Recorded Investment, With no related allowance recorded	15,087,000		16,983,000		19,548,000
Average Recorded Investment, With allowance recorded	50,487,000		57,079,000		78,950,000
Average Recorded Investment	65,574,000		74,062,000		98,498,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	426,000		1,378,000		2,610,000
Interest Income Recognized	426,000		1,378,000		2,610,000
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	13,267,000		13,267,000		24,408,000
Recorded Investment, With allowance recorded	96,637,000		96,637,000		121,618,000
Recorded Investment	109,904,000		109,904,000		146,026,000
Unpaid Principal Balance, With no related allowance recorded	18,605,000		18,605,000		30,805,000
Unpaid Principal Balance, With allowance recorded	98,273,000		98,273,000		121,642,000
Unpaid Principal Balance	116,878,000		116,878,000		152,447,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	12,568,000		12,568,000		10,451,000
Related Allowance	12,568,000		12,568,000		10,451,000
Average Recorded Investment, With no related allowance recorded	22,329,000		22,959,000		28,532,000
Average Recorded Investment, With allowance recorded	86,712,000		100,900,000		170,171,000
Average Recorded Investment	109,041,000		123,859,000		198,703,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	617,000		2,206,000		5,002,000
Interest Income Recognized	617,000		2,206,000		5,002,000
Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,867,000		1,867,000		995,000
Recorded Investment, With allowance recorded	37,991,000		37,991,000		43,591,000
Recorded Investment	39,858,000		39,858,000		44,586,000
Unpaid Principal Balance, With no related allowance recorded	3,095,000		3,095,000		2,065,000
Unpaid Principal Balance, With allowance recorded	37,991,000		37,991,000		43,591,000
Unpaid Principal Balance	41,086,000		41,086,000		45,656,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	782,000		782,000		1,270,000
Related Allowance	782,000		782,000		1,270,000
Average Recorded Investment, With no related allowance recorded	2,175,000		1,474,000		1,352,000
Average Recorded Investment, With allowance recorded	38,644,000		40,402,000		48,028,000
Average Recorded Investment	40,819,000		41,876,000		49,380,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	480,000		1,429,000		1,835,000
Interest Income Recognized	$ 480,000		$ 1,429,000		$ 1,835,000