Loans (Narrative) (Details) (USD $)	3 Months Ended					3 Months Ended									3 Months Ended										3 Months Ended		3 Months Ended															3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 07, 2013 Acquired From FDIC [Member] Mountain National Bank [Member]	Mar. 31, 2014 Permanent Mortgage Portfolio Segment [Member]		Mar. 31, 2013 Permanent Mortgage Portfolio Segment [Member]		Dec. 31, 2013 Permanent Mortgage Portfolio Segment [Member]		Dec. 31, 2012 Permanent Mortgage Portfolio Segment [Member]	Mar. 31, 2014 Loans Held For Sale [Member]	Mar. 31, 2013 Loans Held For Sale [Member]	Mar. 31, 2014 Residential Real Estate [Member]	Mar. 31, 2014 Consumer Real Estate Portfolio Segment [Member]		Mar. 31, 2013 Consumer Real Estate Portfolio Segment [Member]		Dec. 31, 2013 Consumer Real Estate Portfolio Segment [Member]		Dec. 31, 2012 Consumer Real Estate Portfolio Segment [Member]	Mar. 31, 2014 Modified Loans Classified As Tdr [Member]	Mar. 31, 2013 Modified Loans Classified As Tdr [Member]	Mar. 31, 2014 Loans To Mortgage Companies [Member]	Mar. 31, 2013 Loans To Mortgage Companies [Member]	Mar. 31, 2014 Commercial Portfolio Segment [Member]		Mar. 31, 2013 Commercial Portfolio Segment [Member]	Mar. 31, 2014 Credit Card And Other Portfolio Segment [Member]	Mar. 31, 2013 Credit Card And Other Portfolio Segment [Member]	Dec. 31, 2013 Credit Card And Other Portfolio Segment [Member]	Dec. 31, 2012 Credit Card And Other Portfolio Segment [Member]	Mar. 31, 2014 Credit Card Class [Member]	Mar. 31, 2013 Credit Card Class [Member]	Mar. 31, 2014 Heloc And Real Estate Installment Classes [Member]	Mar. 31, 2014 Restricted And Secured Consumer Real Estate Loans [Member]	Dec. 31, 2013 Restricted And Secured Consumer Real Estate Loans [Member]	Mar. 31, 2013 Restricted And Secured Consumer Real Estate Loans [Member]	Dec. 31, 2013 Restricted And Secured Permanent Mortgage Real Estate Loans [Member]	Mar. 31, 2013 Restricted And Secured Permanent Mortgage Real Estate Loans [Member]	Mar. 31, 2014 Finance And Insurance Companies [Member]	Mar. 31, 2014 Finance Insurance And Loans To Mortgage Companies [Member]	Mar. 31, 2014 Maximum [Member] Permanent Mortgage Portfolio Segment [Member]	Mar. 31, 2014 Maximum [Member] Commercial Portfolio Segment [Member]	Mar. 31, 2014 Maximum [Member] Credit Card Class [Member]	Mar. 31, 2014 Maximum [Member] Heloc And Real Estate Installment Classes [Member]	Mar. 31, 2014 Minimum [Member] Non Accruing [Member]	Mar. 31, 2014 Minimum [Member] Permanent Mortgage Portfolio Segment [Member]	Mar. 31, 2014 Minimum [Member] Commercial Portfolio Segment [Member]	Mar. 31, 2014 Minimum [Member] Credit Card Class [Member]	Mar. 31, 2014 Minimum [Member] Heloc And Real Estate Installment Classes [Member]	Mar. 31, 2014 Pass Maximum [Member] number	Mar. 31, 2014 Pass Minimum [Member] number	Mar. 31, 2014 Special Mention number	Mar. 31, 2014 Substandard number	Mar. 31, 2014 Doubtful number	Mar. 31, 2014 Unlikely to be Collected Financing Receivable Maximum [Member] number	Mar. 31, 2014 Commercial Loan P D Grade One [Member] number	Mar. 31, 2013 Commercial Loan P D Grade One [Member]	Mar. 31, 2014 Commercial Loan P D Grade Twelve [Member]	Mar. 31, 2013 Commercial Loan P D Grade Twelve [Member]	Mar. 31, 2014 Commercial Loan P D Grade Thirteen [Member]	Mar. 31, 2013 Commercial Loan P D Grade Thirteen [Member]	Mar. 31, 2014 Commercial Loan P D Grade Thirteen [Member] Minimum [Member]	Mar. 31, 2014 Commercial Loan L G D Grade One [Member] Minimum [Member] number	Mar. 31, 2014 Commercial Loan L G D Grade Twelve [Member] Maximum [Member] number	Mar. 31, 2014 Loan Reassessed [Member] Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial & industrial loan portfolio																									9.00%																	21.00%	30.00%
Concentration risk, percentage															39.00%	35.00%									5.00%																	11.00%
Impaired commercial loans																																																$ 1,000,000
Troubled debt restructurings loans	353,400,000	352,400,000											137,000,000	128,600,000
Allowance for loan losses	247,246,000	265,218,000	253,809,000	276,963,000		22,521,000		25,448,000		22,491,000		24,928,000				123,409,000		131,417,000		126,785,000		128,949,000	65,800,000	64,600,000			86,367,000	[1]	101,243,000	13,061,000	7,110,000	7,484,000	6,898,000																										90,000	51,000	2,403,000	2,808,000	7,968,000	8,371,000
Ratio of the allowance for loan losses to loans																							19.00%	18.00%
Average balance of impaired loans	391,004,000	458,291,000																									96,696,000		168,068,000
Interest income recognized on impaired loan	1,681,000	1,631,000																									244,000		229,000
Commercial loans																									709,552,000	1,130,079,000	8,859,764,000	[2]	9,207,065,000													1,600,000,000																							500,000			1,000,000
Forbearance agreements time period																																													12 months					6 months
TDR, reduction of interest rate by increment, basis points						0.25%																														0.25%
Modified interest rate																																																	2.00%			1.00%
Modified interest rate time period																																												5 years			5 years		5 years
TDRS Maturities						40 years										30 years
Payment reductions, time period																																														1 year					6 months
Credit card workout program, granted rate reduction																																		0.00%
Credit card workout program, term extension																																														5 years
Commercial loan grades																																																					12	1	13	14	15	16								1	12
Time period of default probability																											1 year
Loans, net of unearned income	15,119,461,000	15,889,670,000	15,389,074,000			622,242,000	[3]	793,282,000	[3]	662,242,000	[3]					5,258,014,000	[4]	5,590,180,000	[4]	5,333,371,000	[4]				709,552,000	1,130,079,000				333,792,000	299,143,000	336,606,000		183,443,000	181,223,000		86,700,000	333,800,000	386,400,000	11,200,000	13,000,000
Loans acquired					249,000,000
Modified interest rate increase						1.00%
Provision for loan losses	10,000,000	15,000,000				1,670,000		3,763,000								3,914,000		20,960,000												8,657,000	2,547,000
Loan loss provision on PCI loans	1,200,000
Allowance - purchased credit impaired loans	$ 1,899,000					$ 0										$ 10,000														$ 0
Lowest expected default probability																																																											1

[1] Allowance excludes $1.9 million related to PCI loans as of March 31, 2014.

[2] Balance as of March 31, 2014, excludes PCI loans amounting to $45.6 million.

[3] Balances as of March 31, 2013, and December 31, 2013 include $13.0 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[4] Balances as of March 31, 2014 and 2013, and December 31, 2013 include $86.7 million, $386.4 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.