Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 notes		Sep. 30, 2012 notes		Dec. 31, 2011
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans Renegotiated in Troubled Debt Restructurings	$ 90,410		$ 90,410		$ 94,827
Loans Renegotiated in Troubled Debt Restructurings, Non-Accrual Loans	54,982		54,982		57,451
Loans Renegotiated in Troubled Debt Restructurings, Accrual Loans	35,428		35,428		37,376
Number of Notes	5,000		29,000
Principle Balance at Restructure Date	1,482		18,830
Number of Notes	2,000		5,000
Balance	599		1,574
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		581
Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	586		1,007
Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	861		4,737
Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	35	[1]	12,505	[1]
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	2,000		14,000
Principle Balance at Restructure Date	1,060		13,548
Number of Notes	0		2,000
Balance	0		507
Commercial real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Commercial real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	432		432
Commercial real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	628		4,504
Commercial real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0	[1]	8,612	[1]
Land acquisition & development construction real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			3,000
Principle Balance at Restructure Date			852
Number of Notes	0		1,000
Balance	0		468
Land acquisition & development construction real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Land acquisition & development construction real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			229
Land acquisition & development construction real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Land acquisition & development construction real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			623	[1]
Commercial construction real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			1,000
Principle Balance at Restructure Date			3,155
Commercial construction real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Commercial construction real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Commercial construction real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Commercial construction real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			3,155
Residential construction real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	1,000		1,000
Principle Balance at Restructure Date	233		233
Residential construction real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Residential construction real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Residential construction real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	233		233
Residential construction real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	1,000		5,000
Principle Balance at Restructure Date	233		4,240
Number of Notes	0		1,000
Balance	0		468
Total construction loans | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Total construction loans | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		229
Total construction loans | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	233		233
Total construction loans | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0	[1]	3,778	[1]
Residential real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			2,000
Principle Balance at Restructure Date			593
Number of Notes	2,000		2,000
Balance	599		599
Residential real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			568
Residential real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			25
Residential real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Residential real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0	[1]
Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	4,000		22,000
Principle Balance at Restructure Date	1,447		18,535
Number of Notes	2,000		5,000
Balance	599		1,574
Total real estate loans | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		568
Total real estate loans | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	586		840
Total real estate loans | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	861		4,737
Total real estate loans | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0	[1]	12,390	[1]
Other consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			1,000
Principle Balance at Restructure Date			69
Other consumer | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Other consumer | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			69
Other consumer | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Other consumer | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0	[1]
Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			1,000
Principle Balance at Restructure Date			69
Total consumer loans | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Total consumer loans | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			69
Total consumer loans | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0
Total consumer loans | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date			0	[1]
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	1,000
Principle Balance at Restructure Date	35		226
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes			6,000
Principle Balance at Restructure Date	0		13
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		98
Commercial | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Commercial | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	35		115
Agricultural real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes	1,000		1,000
Principle Balance at Restructure Date	154		154
Agricultural real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Agricultural real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	154		154
Agricultural real estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	0		0
Agricultural real estate | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Principle Balance at Restructure Date	$ 0		$ 0

[1] Other includes concessions that reduce or defer payments for a specified period of time and/or extend amortization schedules.