Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 1,217,494	$ 1,217,494	$ 1,307,572
Unpaid Principal Balance	1,560,525	1,560,525	1,679,468
Related Allowance	94,949	94,949	109,484
Average Recorded Investment	1,249,177	1,266,299	1,208,618
Interest Income Recognized	5,279	11,626	18,364
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,189	10,189	10,943
Unpaid Principal Balance	11,322	11,322	12,389
Related Allowance	76	76	93
Average Recorded Investment	10,561	10,775	6,562
Interest Income Recognized	62	118	17
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	44,415	44,415	39,736
Unpaid Principal Balance	46,038	46,038	41,097
Related Allowance	683	683	2,306
Average Recorded Investment	37,065	36,332	24,238
Interest Income Recognized	195	464	660
Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,479	5,479	2,437
Unpaid Principal Balance	5,479	5,479	2,439
Related Allowance	93	93	42
Average Recorded Investment	3,811	3,347	6,467
Interest Income Recognized	61	75	31
Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	287,694	287,694	286,975
Unpaid Principal Balance	321,097	321,097	323,748
Related Allowance	31,154	31,154	23,384
Average Recorded Investment	279,130	273,331	300,041
Interest Income Recognized	1,387	3,292	6,773
1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	244,230	244,230	283,512
Unpaid Principal Balance	377,252	377,252	443,274
Related Allowance	14,388	14,388	23,499
Average Recorded Investment	259,748	270,083	279,870
Interest Income Recognized	1,228	2,493	2,859
Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	260,000	260,000	299,670
Unpaid Principal Balance	371,188	371,188	414,430
Related Allowance	11,932	11,932	17,564
Average Recorded Investment	277,399	287,586	271,644
Interest Income Recognized	405	1,026	2,136
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	791,924	791,924	870,157
Unpaid Principal Balance	1,069,537	1,069,537	1,181,452
Related Allowance	57,474	57,474	64,447
Average Recorded Investment	816,277	831,000	851,555
Interest Income Recognized	3,020	6,811	11,768
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	365,487	365,487	384,299
Unpaid Principal Balance	428,149	428,149	442,091
Related Allowance	36,623	36,623	42,596
Average Recorded Investment	381,463	384,845	319,796
Interest Income Recognized	1,941	4,158	5,888
Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	60,083	60,083	53,116
Unpaid Principal Balance	62,839	62,839	55,925
Related Allowance	852	852	2,441
Average Recorded Investment	51,437	50,454	37,267
Interest Income Recognized	318	657	708
With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	424,120	424,120	450,520
Unpaid Principal Balance	760,865	760,865	796,652
Related Allowance	0	0	0
Average Recorded Investment	433,296	440,698	484,097
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,420	3,420	3,948
Unpaid Principal Balance	4,553	4,553	5,394
Related Allowance	0	0	0
Average Recorded Investment	3,734	3,721	4,450
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,255	3,255	4,970
Unpaid Principal Balance	4,878	4,878	6,293
Related Allowance	0	0	0
Average Recorded Investment	3,353	4,420	3,907
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3	3	736
Unpaid Principal Balance	3	3	738
Related Allowance	0	0	0
Average Recorded Investment	0	247	68
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	37,114	37,114	59,930
Unpaid Principal Balance	69,998	69,998	96,238
Related Allowance	0	0	0
Average Recorded Investment	45,404	49,786	67,324
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | 1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	108,315	108,315	118,756
Unpaid Principal Balance	240,896	240,896	274,959
Related Allowance	0	0	0
Average Recorded Investment	113,371	118,010	158,763
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	188,801	188,801	196,823
Unpaid Principal Balance	298,465	298,465	295,562
Related Allowance	0	0	0
Average Recorded Investment	191,222	192,873	174,590
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	334,230	334,230	375,509
Unpaid Principal Balance	609,359	609,359	666,759
Related Allowance	0	0	0
Average Recorded Investment	349,997	360,669	400,677
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	83,212	83,212	65,357
Unpaid Principal Balance	142,072	142,072	117,468
Related Allowance	0	0	0
Average Recorded Investment	76,212	71,641	74,995
Interest Income Recognized	0	0	0
With No Related Allowance Recorded [Member] | Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,678	6,678	9,654
Unpaid Principal Balance	9,434	9,434	12,425
Related Allowance	0	0	0
Average Recorded Investment	7,087	8,388	8,425
Interest Income Recognized	0	0	0
With Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	793,374	793,374	857,052
Unpaid Principal Balance	799,660	799,660	882,816
Related Allowance	94,949	94,949	109,484
Average Recorded Investment	815,881	825,601	724,521
Interest Income Recognized	5,279	11,626	18,364
With Allowance Recorded [Member] | Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,769	6,769	6,995
Unpaid Principal Balance	6,769	6,769	6,995
Related Allowance	76	76	93
Average Recorded Investment	6,827	7,054	2,112
Interest Income Recognized	62	118	17
With Allowance Recorded [Member] | Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	41,160	41,160	34,766
Unpaid Principal Balance	41,160	41,160	34,804
Related Allowance	683	683	2,306
Average Recorded Investment	33,712	31,912	20,331
Interest Income Recognized	195	464	660
With Allowance Recorded [Member] | Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,476	5,476	1,701
Unpaid Principal Balance	5,476	5,476	1,701
Related Allowance	93	93	42
Average Recorded Investment	3,811	3,100	6,399
Interest Income Recognized	61	75	31
With Allowance Recorded [Member] | Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	250,580	250,580	227,045
Unpaid Principal Balance	251,099	251,099	227,510
Related Allowance	31,154	31,154	23,384
Average Recorded Investment	233,726	223,545	232,717
Interest Income Recognized	1,387	3,292	6,773
With Allowance Recorded [Member] | 1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	135,915	135,915	164,756
Unpaid Principal Balance	136,356	136,356	168,315
Related Allowance	14,388	14,388	23,499
Average Recorded Investment	146,377	152,073	121,107
Interest Income Recognized	1,228	2,493	2,859
With Allowance Recorded [Member] | Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	71,199	71,199	102,847
Unpaid Principal Balance	72,723	72,723	118,868
Related Allowance	11,932	11,932	17,564
Average Recorded Investment	86,177	94,713	97,054
Interest Income Recognized	405	1,026	2,136
With Allowance Recorded [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	457,694	457,694	494,648
Unpaid Principal Balance	460,178	460,178	514,693
Related Allowance	57,474	57,474	64,447
Average Recorded Investment	466,280	470,331	450,878
Interest Income Recognized	3,020	6,811	11,768
With Allowance Recorded [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	282,275	282,275	318,942
Unpaid Principal Balance	286,077	286,077	324,623
Related Allowance	36,623	36,623	42,596
Average Recorded Investment	305,251	313,204	244,801
Interest Income Recognized	1,941	4,158	5,888
With Allowance Recorded [Member] | Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	53,405	53,405	43,462
Unpaid Principal Balance	53,405	53,405	43,500
Related Allowance	852	852	2,441
Average Recorded Investment	44,350	42,066	28,842
Interest Income Recognized	$ 318	$ 657	$ 708