Allowance for Loan Losses Accruing and Non-Accruing Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 147,031	[1]	$ 150,487	[1]	$ 151,326	[1]
Impaired Financing Receivable, Related Allowance	6,150	[2]	5,004	[2]	7,237	[2]
Noncovered Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	85,572	[1]	84,649	[1]	75,153	[1]
Covered TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	61,459	[1]	65,838	[1]	76,173
Accruing TDRs [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	129,551		135,453		140,895
Financing Receivable, Recorded Investment, Current	76,794		77,630		105,290
Financing Receivable, Recorded Investment, Past Due	52,757		57,823		35,605
Accruing TDRs [Member] | Noncovered Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	68,092		69,615		64,722
Financing Receivable, Recorded Investment, Current	63,341		61,544		62,631
Financing Receivable, Recorded Investment, Past Due	4,751		8,071		2,091
Accruing TDRs [Member] | Covered TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	61,459		65,838		76,173
Financing Receivable, Recorded Investment, Current	13,453		16,086		42,659
Financing Receivable, Recorded Investment, Past Due	48,006		49,752		33,514
Nonaccruing TDRs [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	17,480		15,034		10,431
Financing Receivable, Recorded Investment, Current	11,649		9,336		6,282
Financing Receivable, Recorded Investment, Past Due	5,831		5,698		4,149
Nonaccruing TDRs [Member] | Noncovered Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	17,480		15,034		10,431
Financing Receivable, Recorded Investment, Current	11,649		9,336		6,282
Financing Receivable, Recorded Investment, Past Due	5,831		5,698		4,149
Nonaccruing TDRs [Member] | Covered TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Total Tdr Allowance [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	10,925		11,297		15,182
Total Tdr Allowance [Member] | Noncovered Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	4,486		4,600		4,833
Total Tdr Allowance [Member] | Covered TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	6,439		6,697		10,349
Commercial and Industrial Financing Receivable [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,627	[1]	2,617	[1]	3,388	[1]
Commercial and Industrial Financing Receivable [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,722		1,763		7,662
Commercial and Industrial Financing Receivable [Member] | Accruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,580		1,708		1,791
Financing Receivable, Recorded Investment, Current	1,580		704		1,791
Financing Receivable, Recorded Investment, Past Due	0		1,004		0
Commercial and Industrial Financing Receivable [Member] | Accruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,722		1,763		7,662
Financing Receivable, Recorded Investment, Current	984		435		2,405
Financing Receivable, Recorded Investment, Past Due	738		1,328		5,257
Commercial and Industrial Financing Receivable [Member] | Nonaccruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,047		909		1,597
Financing Receivable, Recorded Investment, Current	0		844		0
Financing Receivable, Recorded Investment, Past Due	1,047		65		1,597
Commercial and Industrial Financing Receivable [Member] | Nonaccruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Commercial and Industrial Financing Receivable [Member] | Total Tdr Allowance [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	293		217		822
Commercial and Industrial Financing Receivable [Member] | Total Tdr Allowance [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	518		518		1,384
Commercial Real Estate [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	17,217	[1]	16,305	[1]	9,136	[1]
Commercial Real Estate [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	48,329		50,272		54,824
Commercial Real Estate [Member] | Accruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	14,441		13,512		4,182
Financing Receivable, Recorded Investment, Current	14,441		12,719		3,672
Financing Receivable, Recorded Investment, Past Due	0		793		510
Commercial Real Estate [Member] | Accruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	48,329		50,272		54,824
Financing Receivable, Recorded Investment, Current	5,371		7,658		36,419
Financing Receivable, Recorded Investment, Past Due	42,958		42,614		18,405
Commercial Real Estate [Member] | Nonaccruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,776		2,793		4,954
Financing Receivable, Recorded Investment, Current	991		461		3,152
Financing Receivable, Recorded Investment, Past Due	1,785		2,332		1,802
Commercial Real Estate [Member] | Nonaccruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Commercial Real Estate [Member] | Total Tdr Allowance [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	769		869		224
Commercial Real Estate [Member] | Total Tdr Allowance [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	4,701		4,959		7,720
Commercial Real Estate Construction Financing Receivable [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,779	[1]	2,955	[1]	4,593	[1]
Commercial Real Estate Construction Financing Receivable [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,295		8,171		13,687
Commercial Real Estate Construction Financing Receivable [Member] | Accruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,423		2,820		4,077
Financing Receivable, Recorded Investment, Current	1,716		1,860		4,077
Financing Receivable, Recorded Investment, Past Due	707		960		0
Commercial Real Estate Construction Financing Receivable [Member] | Accruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,295		8,171		13,687
Financing Receivable, Recorded Investment, Current	2,482		2,361		3,835
Financing Receivable, Recorded Investment, Past Due	3,813		5,810		9,852
Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	356		135		516
Financing Receivable, Recorded Investment, Current	356		135		137
Financing Receivable, Recorded Investment, Past Due	0		0		379
Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Commercial Real Estate Construction Financing Receivable [Member] | Total Tdr Allowance [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	90		105		224
Commercial Real Estate Construction Financing Receivable [Member] | Total Tdr Allowance [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,220		1,220		1,245
Commercial Loan [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	22,623	[1]	21,877	[1]	17,117	[1]
Commercial Loan [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	56,346		60,206
Commercial Loan [Member] | Accruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	18,444		18,040		10,050
Financing Receivable, Recorded Investment, Current	17,737		15,283		9,540
Financing Receivable, Recorded Investment, Past Due	707		2,757		510
Commercial Loan [Member] | Accruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	56,346		60,206
Financing Receivable, Recorded Investment, Current	8,837		10,454
Financing Receivable, Recorded Investment, Past Due	47,509		49,752
Commercial Loan [Member] | Nonaccruing TDRs [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,179		3,837		7,067
Financing Receivable, Recorded Investment, Current	1,347		1,440		3,289
Financing Receivable, Recorded Investment, Past Due	2,832		2,397		3,778
Commercial Loan [Member] | Nonaccruing TDRs [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Recorded Investment, Current	0		0
Financing Receivable, Recorded Investment, Past Due	0		0
Commercial Loan [Member] | Total Tdr Allowance [Member] | Noncovered Loans Commercial [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,152		1,191		1,270
Commercial Loan [Member] | Total Tdr Allowance [Member] | Covered Commercial TDR Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	6,439		6,697
Consumer Installment [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	31,117		30,870		32,378
Consumer Installment [Member] | Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	27,197		28,632		32,301
Financing Receivable, Recorded Investment, Current	26,031		27,085		31,167
Financing Receivable, Recorded Investment, Past Due	1,166		1,547		1,134
Consumer Installment [Member] | Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,920		2,238		77
Financing Receivable, Recorded Investment, Current	3,744		2,064		0
Financing Receivable, Recorded Investment, Past Due	176		174		77
Consumer Installment [Member] | Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,458		1,526		1,901
Consumer Home Equity Lines Financing Receivable [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,917		6,281		5,522
Consumer Home Equity Lines Financing Receivable [Member] | Covered Consumer Loans [Member] [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,113		5,632
Consumer Home Equity Lines Financing Receivable [Member] | Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,362		5,419		5,215
Financing Receivable, Recorded Investment, Current	5,122		5,183		4,828
Financing Receivable, Recorded Investment, Past Due	240		236		387
Consumer Home Equity Lines Financing Receivable [Member] | Accruing TDRs [Member] | Covered Consumer Loans [Member] [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,113		5,632
Financing Receivable, Recorded Investment, Current	4,616		5,632
Financing Receivable, Recorded Investment, Past Due	497		0
Consumer Home Equity Lines Financing Receivable [Member] | Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,555		862		307
Financing Receivable, Recorded Investment, Current	1,329		636		75
Financing Receivable, Recorded Investment, Past Due	226		226		232
Consumer Home Equity Lines Financing Receivable [Member] | Nonaccruing TDRs [Member] | Covered Consumer Loans [Member] [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Recorded Investment, Current	0		0
Financing Receivable, Recorded Investment, Past Due	0		0
Consumer Home Equity Lines Financing Receivable [Member] | Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	89		34		66
Consumer Home Equity Lines Financing Receivable [Member] | Total Tdr Allowance [Member] | Covered Consumer Loans [Member] [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		0
Consumer Credit Card Financing Receivable [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,388	[1]	1,612	[1]	2,060	[1]
Consumer Credit Card Financing Receivable [Member] | Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,378		1,601		2,057
Financing Receivable, Recorded Investment, Current	1,283		1,483		1,997
Financing Receivable, Recorded Investment, Past Due	95		118		60
Consumer Credit Card Financing Receivable [Member] | Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10		11		3
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	10		11		3
Consumer Credit Card Financing Receivable [Member] | Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	74		127		92
Consumer Residential Mortgages Financing Receivable [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,527		24,009		18,076
Consumer Residential Mortgages Financing Receivable [Member] | Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,711		15,923		15,099
Financing Receivable, Recorded Investment, Current	13,168		12,510		15,099
Financing Receivable, Recorded Investment, Past Due	2,543		3,413		0
Consumer Residential Mortgages Financing Receivable [Member] | Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,816		8,086		2,977
Financing Receivable, Recorded Investment, Current	5,229		5,196		2,918
Financing Receivable, Recorded Investment, Past Due	2,587		2,890		59
Consumer Residential Mortgages Financing Receivable [Member] | Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,713		1,722		1,504
Consumer Loan [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	62,949	[1]	62,772	[1]	58,036	[1]
Consumer Loan [Member] | Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	49,648		51,575		54,672
Financing Receivable, Recorded Investment, Current	45,604		46,261		53,091
Financing Receivable, Recorded Investment, Past Due	4,044		5,314		1,581
Consumer Loan [Member] | Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,301		11,197		3,364
Financing Receivable, Recorded Investment, Current	10,302		7,896		2,993
Financing Receivable, Recorded Investment, Past Due	2,999		3,301		371
Consumer Loan [Member] | Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	$ 3,334		$ 3,409		$ 3,563

[1] (a) The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.

[2] (a) These tables exclude loans fully charged off.