Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	$ 92,538	$ 132,702
Unpaid principal balance, with related allowance	183,605	214,981
Unpaid Principal Balance	276,143	347,683
Recorded investment, with no related allowance	73,932	94,451
Recorded investment, with related allowance	139,247	175,889
Recorded Investment	213,179	270,340
Related Allowance	65,436	79,175
Real-estate commercial mortage [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	29,656	44,649
Unpaid principal balance, with related allowance	45,568	69,173
Recorded investment, with no related allowance	24,117	34,189
Recorded investment, with related allowance	37,405	55,443
Related Allowance	15,365	21,612
Commercial - Secured [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	35,102	40,409
Unpaid principal balance, with related allowance	28,438	52,660
Recorded investment, with no related allowance	28,665	30,112
Recorded investment, with related allowance	22,322	39,114
Related Allowance	12,972	17,187
Commercial - unsecured [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	0	132
Unpaid principal balance, with related allowance	1,303	2,142
Recorded investment, with no related allowance	0	131
Recorded investment, with related allowance	1,245	2,083
Related Allowance	898	1,597
Real-estate - home equity [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	399	300
Unpaid principal balance, with related allowance	20,730	12,843
Recorded investment, with no related allowance	300	300
Recorded investment, with related allowance	14,762	12,843
Related Allowance	9,538	8,380
Real-estate - residential mortgage [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	0	486
Unpaid principal balance, with related allowance	62,534	53,610
Recorded investment, with no related allowance	0	486
Recorded investment, with related allowance	50,269	53,610
Related Allowance	22,263	24,108
Construction - commercial residential [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	24,389	40,432
Unpaid principal balance, with related allowance	23,490	21,336
Recorded investment, with no related allowance	18,836	23,548
Recorded investment, with related allowance	12,351	9,831
Related Allowance	3,941	4,787
Construction - Commercial [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	2,992	6,294
Unpaid principal balance, with related allowance	857	2,602
Recorded investment, with no related allowance	2,014	5,685
Recorded investment, with related allowance	374	2,350
Related Allowance	157	1,146
Construction other [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	665	576
Recorded investment, with related allowance	499	576
Related Allowance	285	326
Consumer - direct [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	18	29
Recorded investment, with related allowance	18	29
Related Allowance	15	25
Consumer - Indirect [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	2	0
Recorded investment, with related allowance	2	0
Related Allowance	2	0
Leasing and other and overdrafts [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	0	10
Recorded investment, with related allowance	0	10
Related Allowance	$ 0	$ 7