Loans and Allowance for Loan Losses (Troubled Debt Restructurings That Subsequently Defaulted) (Details) (Troubled Debt Restructurings That Subsequently Defaulted [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012 Contract		Sep. 30, 2011 Contract		Sep. 30, 2012 Contract		Sep. 30, 2011 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	18	[1],[2]	10	[1],[2]	57	[1],[3]	81	[1],[3]
Recorded Investment	$ 11,234	[1],[2]	$ 2,255	[1],[2]	$ 60,093	[1],[3]	$ 76,614	[1],[3]
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	[1],[2]	0	[1],[2]	0	[1],[3]	0	[1],[3]
Recorded Investment	1,742	[1],[2]	0	[1],[2]	0	[1],[3]	0	[1],[3]
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	5	[1],[2]	3	[1],[2]	6	[1],[3]	2	[1],[3]
Recorded Investment	833	[1],[2]	541	[1],[2]	2,017	[1],[3]	444	[1],[3]
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	[1],[2]	0	[1],[2]	0	[1],[3]	0	[1],[3]
Recorded Investment	0	[1],[2]	0	[1],[2]	0	[1],[3]	0	[1],[3]
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	4	[1],[2]	1	[1],[2]	1	[1],[3]	1	[1],[3]
Recorded Investment	233	[1],[2]	25	[1],[2]	124	[1],[3]	124	[1],[3]
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	9	[1],[2]	1	[1],[2]	4	[1],[3]	0	[1],[3]
Recorded Investment	15,768	[1],[2]	50	[1],[2]	4,166	[1],[3]	0	[1],[3]
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	15	[1],[2]	2	[1],[2]	15	[1],[3]	8	[1],[3]
Recorded Investment	18,113	[1],[2]	679	[1],[2]	10,128	[1],[3]	4,822	[1],[3]
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	28	[1],[2]	1	[1],[2]	13	[1],[3]	3	[1],[3]
Recorded Investment	20,954	[1],[2]	282	[1],[2]	29,934	[1],[3]	3,873	[1],[3]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11	[1],[2]	4	[1],[2]	32	[1],[3]	52	[1],[3]
Recorded Investment	8,695	[1],[2]	1,011	[1],[2]	44,228	[1],[3]	54,835	[1],[3]
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	17	[1],[2]	2	[1],[2]	18	[1],[3]	4	[1],[3]
Recorded Investment	18,971	[1],[2]	678	[1],[2]	13,724	[1],[3]	1,971	[1],[3]
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	[1],[2]	4	[1],[2]	7	[1],[3]	12	[1],[3]
Recorded Investment	$ 568	[1],[2]	$ 566	[1],[2]	$ 2,141	[1],[3]	$ 2,808	[1],[3]

[1] Subsequently defaulted is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.

[2] For the three months ended September 30, 2011, this represents defaults on loans that were modified between the periods October 1, 2010 and September 30, 2011.

[3] For the nine months ended September 30, 2011, this represents defaults on loans that were modified between the periods April 1, 2010 and September 30, 2011.