Loans and Allowance for Credit Losses Past Due Loan Status and Non-Accrual Loans by Portfolio Segment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
31-59 Days Past Due	$ 51,177	$ 60,774
60-89 Days Past Due	17,169	16,893
>90 Days Past Due and Accruing	17,402	20,524
Non-accrual	121,080	133,753
Total >90 Days	138,482	154,277
Total Past Due	206,828	231,944
Current	12,904,888	12,550,276
Loans, net of unearned income	13,111,716	12,782,220
Commercial – industrial, financial and agricultural
31-59 Days Past Due	5,234	9,248
60-89 Days Past Due	1,023	1,490
>90 Days Past Due and Accruing	619	1,311
Non-accrual	29,769	36,710
Total >90 Days	30,388	38,021
Total Past Due	36,645	48,759
Current	3,688,922	3,579,661
Loans, net of unearned income	3,725,567	3,628,420
Real estate – commercial mortgage
31-59 Days Past Due	14,399	15,474
60-89 Days Past Due	3,677	4,009
>90 Days Past Due and Accruing	800	3,502
Non-accrual	44,437	40,566
Total >90 Days	45,237	44,068
Total Past Due	63,313	63,551
Current	5,133,842	5,038,371
Loans, net of unearned income	5,197,155	5,101,922
Commercial - secured
31-59 Days Past Due	4,839	8,916
60-89 Days Past Due	958	1,365
>90 Days Past Due and Accruing	610	1,311
Non-accrual	28,747	35,774
Total >90 Days	29,357	37,085
Total Past Due	35,154	47,366
Current	3,529,460	3,356,797
Loans, net of unearned income	3,564,614	3,404,163
Commercial - unsecured
31-59 Days Past Due	395	332
60-89 Days Past Due	65	125
>90 Days Past Due and Accruing	9	0
Non-accrual	1,022	936
Total >90 Days	1,031	936
Total Past Due	1,491	1,393
Current	159,462	222,864
Loans, net of unearned income	160,953	224,257
Real estate – home equity
31-59 Days Past Due	8,048	13,555
60-89 Days Past Due	2,883	2,474
>90 Days Past Due and Accruing	4,257	3,711
Non-accrual	10,483	13,272
Total >90 Days	14,740	16,983
Total Past Due	25,671	33,012
Current	1,711,017	1,731,185
Loans, net of unearned income	1,736,688	1,764,197
Real estate – residential mortgage
31-59 Days Past Due	18,789	16,969
60-89 Days Past Due	8,145	6,310
>90 Days Past Due and Accruing	8,952	9,065
Non-accrual	20,043	22,282
Total >90 Days	28,995	31,347
Total Past Due	55,929	54,626
Current	1,321,139	1,282,754
Loans, net of unearned income	1,377,068	1,337,380
Real estate – construction
31-59 Days Past Due	160	14
60-89 Days Past Due	0	645
>90 Days Past Due and Accruing	51	346
Non-accrual	16,348	20,921
Total >90 Days	16,399	21,267
Total Past Due	16,559	21,926
Current	674,042	551,746
Loans, net of unearned income	690,601	573,672
Construction - commercial residential
31-59 Days Past Due	160	0
60-89 Days Past Due	0	270
>90 Days Past Due and Accruing	0	346
Non-accrual	13,463	16,153
Total >90 Days	13,463	16,499
Total Past Due	13,623	16,769
Current	190,047	187,166
Loans, net of unearned income	203,670	203,935
Construction - commercial
31-59 Days Past Due	0	14
60-89 Days Past Due	0	375
>90 Days Past Due and Accruing	0	0
Non-accrual	2,604	4,220
Total >90 Days	2,604	4,220
Total Past Due	2,604	4,609
Current	424,815	296,322
Loans, net of unearned income	427,419	300,931
Construction - other
31-59 Days Past Due	0	0
60-89 Days Past Due	0	0
>90 Days Past Due and Accruing	51	0
Non-accrual	281	548
Total >90 Days	332	548
Total Past Due	332	548
Current	59,180	68,258
Loans, net of unearned income	59,512	68,806
Consumer
31-59 Days Past Due	4,190	4,955
60-89 Days Past Due	1,275	1,943
>90 Days Past Due and Accruing	2,590	2,541
Non-accrual	0	2
Total >90 Days	2,590	2,543
Total Past Due	8,055	9,441
Current	257,376	273,683
Loans, net of unearned income	265,431	283,124
Consumer - direct
31-59 Days Past Due	2,034	2,091
60-89 Days Past Due	857	1,495
>90 Days Past Due and Accruing	2,414	2,391
Non-accrual	0	0
Total >90 Days	2,414	2,391
Total Past Due	5,305	5,977
Current	104,018	126,666
Loans, net of unearned income	109,323	132,643
Consumer - indirect
31-59 Days Past Due	2,156	2,864
60-89 Days Past Due	418	448
>90 Days Past Due and Accruing	176	150
Non-accrual	0	2
Total >90 Days	176	152
Total Past Due	2,750	3,464
Current	153,358	147,017
Loans, net of unearned income	156,108	150,481
Leasing and other and overdrafts
31-59 Days Past Due	357	559
60-89 Days Past Due	166	22
>90 Days Past Due and Accruing	133	48
Non-accrual	0	0
Total >90 Days	133	48
Total Past Due	656	629
Current	118,550	92,876
Loans, net of unearned income	$ 119,206	$ 93,505

Financing receivables that are less than 60 days past due but more than 29 days past due.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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