Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 84,479		$ 94,001
Recorded Investment, With allowance recorded	669,824		742,553
Recorded Investment	754,303		836,554
Unpaid Principal Balance, With no related allowance recorded	166,492		181,809
Unpaid Principal Balance, With allowance recorded	698,344		782,252
Unpaid Principal Balance	864,836		964,061
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	65,167		67,997
Related Allowance	65,167		67,997
Average Recorded Investment, With no related allowance recorded	89,385		122,367
Average Recorded Investment, With allowance recorded	700,735		829,865
Average Recorded Investment	790,120		952,232
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	3,993		21,114
Interest Income Recognized	3,993	0	21,114
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	2,955		2,750
Recorded Investment	2,955		2,750
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	2,955		2,750
Unpaid Principal Balance	2,955		2,750
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	117		116
Related Allowance	117		116
Average Recorded Investment, With no related allowance recorded	0		33
Average Recorded Investment, With allowance recorded	2,606		4,668
Average Recorded Investment	2,606		4,701
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	70		176
Interest Income Recognized	70		176
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,678		1,180
Recorded Investment, With allowance recorded	42,416		44,019
Recorded Investment	44,094		45,199
Unpaid Principal Balance, With no related allowance recorded	3,173		2,840
Unpaid Principal Balance, With allowance recorded	42,416		44,019
Unpaid Principal Balance	45,589		46,859
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	1,385		967
Related Allowance	1,385		967
Average Recorded Investment, With no related allowance recorded	654		1,487
Average Recorded Investment, With allowance recorded	42,590		48,674
Average Recorded Investment	43,244		50,161
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	0		1,910
Interest Income Recognized	0		1,910
Credit Card Receivable [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	0		0
Recorded Investment	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	0		0
Unpaid Principal Balance	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	0		0
Related Allowance	0		0
Average Recorded Investment, With no related allowance recorded	0		0
Average Recorded Investment, With allowance recorded	0		0
Average Recorded Investment	0		0
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	0		0
Interest Income Recognized	0		0
Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	5,194		7,013
Recorded Investment	5,194		7,013
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	5,194		7,013
Unpaid Principal Balance	5,194		7,013
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	93		109
Related Allowance	93		109
Average Recorded Investment, With no related allowance recorded	0		4
Average Recorded Investment, With allowance recorded	4,230		5,555
Average Recorded Investment	4,230		5,559
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	56		285
Interest Income Recognized	56		285
Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	14,297		14,218
Recorded Investment, With allowance recorded	160,764		186,058
Recorded Investment	175,061		200,276
Unpaid Principal Balance, With no related allowance recorded	16,927		15,820
Unpaid Principal Balance, With allowance recorded	167,390		193,765
Unpaid Principal Balance	184,317		209,585
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	10,569		8,863
Related Allowance	10,569		8,863
Average Recorded Investment, With no related allowance recorded	14,189		18,046
Average Recorded Investment, With allowance recorded	168,365		226,987
Average Recorded Investment	182,554		245,033
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	1,078		5,062
Interest Income Recognized	1,078		5,062
1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,494		9,679
Recorded Investment, With allowance recorded	104,007		115,063
Recorded Investment	110,501		124,742
Unpaid Principal Balance, With no related allowance recorded	25,664		29,741
Unpaid Principal Balance, With allowance recorded	104,858		117,410
Unpaid Principal Balance	130,522		147,151
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	7,496		11,126
Related Allowance	7,496		11,126
Average Recorded Investment, With no related allowance recorded	8,582		23,879
Average Recorded Investment, With allowance recorded	110,373		115,614
Average Recorded Investment	118,955		139,493
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	814		3,464
Interest Income Recognized	814		3,464
Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	29,280		30,595
Recorded Investment, With allowance recorded	166,842		183,029
Recorded Investment	196,122		213,624
Unpaid Principal Balance, With no related allowance recorded	72,395		78,470
Unpaid Principal Balance, With allowance recorded	185,982		202,048
Unpaid Principal Balance	258,377		280,518
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	24,829		26,789
Related Allowance	24,829		26,789
Average Recorded Investment, With no related allowance recorded	29,380		41,007
Average Recorded Investment, With allowance recorded	173,779		191,807
Average Recorded Investment	203,159		232,814
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	472		2,931
Interest Income Recognized	472		2,931
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	50,071		54,492
Recorded Investment, With allowance recorded	431,613		484,150
Recorded Investment	481,684		538,642
Unpaid Principal Balance, With no related allowance recorded	114,986		124,031
Unpaid Principal Balance, With allowance recorded	458,230		513,223
Unpaid Principal Balance	573,216		637,254
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	42,894		46,778
Related Allowance	42,894		46,778
Average Recorded Investment, With no related allowance recorded	52,151		82,932
Average Recorded Investment, With allowance recorded	452,517		534,408
Average Recorded Investment	504,668		617,340
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	2,364		11,457
Interest Income Recognized	2,364		11,457
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	11,173		13,490
Recorded Investment, With allowance recorded	98,064		112,291
Recorded Investment	109,237		125,781
Unpaid Principal Balance, With no related allowance recorded	19,235		22,312
Unpaid Principal Balance, With allowance recorded	98,247		117,049
Unpaid Principal Balance	117,482		139,361
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	15,176		15,364
Related Allowance	15,176		15,364
Average Recorded Investment, With no related allowance recorded	12,920		15,355
Average Recorded Investment, With allowance recorded	105,791		126,242
Average Recorded Investment	118,711		141,597
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	758		3,534
Interest Income Recognized	758		3,534
Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	21,557		24,839
Recorded Investment, With allowance recorded	81,499		86,661
Recorded Investment	103,056		111,500
Unpaid Principal Balance, With no related allowance recorded	29,098		32,626
Unpaid Principal Balance, With allowance recorded	83,219		92,529
Unpaid Principal Balance	112,317		125,155
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	5,086		4,327
Related Allowance	5,086		4,327
Average Recorded Investment, With no related allowance recorded	23,660		22,556
Average Recorded Investment, With allowance recorded	85,960		106,186
Average Recorded Investment	109,620		128,742
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	730		3,590
Interest Income Recognized	730		3,590
Small Business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	8,083		5,669
Recorded Investment	8,083		5,669
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	8,083		5,669
Unpaid Principal Balance	8,083		5,669
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	416		336
Related Allowance	416		336
Average Recorded Investment, With no related allowance recorded	0		0
Average Recorded Investment, With allowance recorded	7,041		4,132
Average Recorded Investment	7,041		4,132
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	15		162
Interest Income Recognized	15		162
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	32,730		38,329
Recorded Investment, With allowance recorded	187,646		204,621
Recorded Investment	220,376		242,950
Unpaid Principal Balance, With no related allowance recorded	48,333		54,938
Unpaid Principal Balance, With allowance recorded	189,549		215,247
Unpaid Principal Balance	237,882		270,185
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	20,678		20,027
Related Allowance	20,678		20,027
Average Recorded Investment, With no related allowance recorded	36,580		37,911
Average Recorded Investment, With allowance recorded	198,792		236,560
Average Recorded Investment	235,372		274,471
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	1,503		7,286
Interest Income Recognized	1,503		7,286
Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,678		1,180
Recorded Investment, With allowance recorded	50,565		53,782
Recorded Investment	52,243		54,962
Unpaid Principal Balance, With no related allowance recorded	3,173		2,840
Unpaid Principal Balance, With allowance recorded	50,565		53,782
Unpaid Principal Balance	53,738		56,622
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	1,595		1,192
Related Allowance	1,595		1,192
Average Recorded Investment, With no related allowance recorded	654		1,524
Average Recorded Investment, With allowance recorded	49,426		58,897
Average Recorded Investment	50,080		60,421
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	126		2,371
Interest Income Recognized	$ 126		$ 2,371