Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract		Jun. 30, 2013 Contract		Jun. 30, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	147	354		336		495
Recorded Investment	$ 104,221	$ 169,442	[1]	$ 166,402	[2]	$ 259,266	[1]
Net charge-offs	0	519		53		2,000
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2		1		3
Recorded Investment	0	34		80		364
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	38	174		84		198
Recorded Investment	2,639	17,194		10,162		20,550
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0		0		0
Recorded Investment	0	0		0		0
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11	8		24		14
Recorded Investment	964	549		2,525		1,365
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	14	32		38		36
Recorded Investment	450	2,060		1,488		2,393
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	17	26		31		40
Recorded Investment	33,633	70,429		51,524		85,092
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	21	32		58		60
Recorded Investment	19,379	17,743		30,951		39,495
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	21		16		38
Recorded Investment	8,255	22,698		12,637		37,329
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	44	79		105		138
Recorded Investment	61,267	110,870		95,112		161,916
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	40	59		84		106
Recorded Investment	38,901	38,735		57,035		72,678
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	63	216		147		251
Recorded Investment	4,053	19,837		14,255		24,672
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		681		0
Principal Forgiveness [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | Small Business [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Principal Forgiveness [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		424		0
Principal Forgiveness [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		74		0
Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		498		0
Principal Forgiveness [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		183		0
Principal Forgiveness [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	71,884	109,592		118,543		156,410
Below Market Interest Rate [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		330
Below Market Interest Rate [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,204	4,932		7,124		5,920
Below Market Interest Rate [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0			0
Below Market Interest Rate [Member] | Small Business [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	30	151		917		319
Below Market Interest Rate [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	88	492		460		492
Below Market Interest Rate [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	31,375	38,784		47,152		41,259
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	17,067	16,147		24,031		35,698
Below Market Interest Rate [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,353	19,407		5,332		22,056
Below Market Interest Rate [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	49,795	74,338		76,515		99,013
Below Market Interest Rate [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	19,767	29,679		33,527		50,336
Below Market Interest Rate [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,322	5,575		8,501		7,061
Term Extensions and or Other Concessions [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	32,337	59,850		47,178		102,856
Term Extensions and or Other Concessions [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	34		80		34
Term Extensions and or Other Concessions [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	435	12,262		3,038		14,630
Term Extensions and or Other Concessions [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0		0		0
Term Extensions and or Other Concessions [Member] | Small Business [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	934	398		1,608		1,046
Term Extensions and or Other Concessions [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	362	1,568		1,028		1,901
Term Extensions and or Other Concessions [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,258	31,645		4,372		43,833
Term Extensions and or Other Concessions [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,312	1,596		6,496		3,797
Term Extensions and or Other Concessions [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	6,902	3,291		7,231		15,273
Term Extensions and or Other Concessions [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	11,472	36,532		18,099		62,903
Term Extensions and or Other Concessions [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	19,134	9,056		23,325		22,342
Term Extensions and or Other Concessions [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 1,731	$ 14,262		$ 5,754		$ 17,611

[1] Net charge-offs of $519 thousand were recorded during the three months ended June 30, 2012 upon restructuring of these loans.

[2] Net charge-offs of $53 thousand were recorded during the six months ended June 30, 2013 upon restructuring these loans.