Loans and Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary of impaired noncovered loans
Recorded Investment	$ 111,610	$ 128,343
Unpaid Principal Balance	138,970	154,097
Related Allowance	7,080	6,181
Average Recorded Investment	120,838	134,730
Commercial and Industrial Financing Receivable [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	1,270	0
Unpaid Principal Balance	1,769	0
Related Allowance	2,497	0
Average Recorded Investment	752	0
Commercial Real Estate [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	6,521	30,792
Unpaid Principal Balance	6,789	37,767
Related Allowance	1,599	3,852
Average Recorded Investment	3,247	33,172
Construction [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	1,798	7,585
Unpaid Principal Balance	2,864	11,423
Related Allowance	99	1,588
Average Recorded Investment	1,929	8,928
Consumer Installment Financing Receivable [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	33,571	0
Unpaid Principal Balance	33,621	0
Related Allowance	1,382	0
Average Recorded Investment	33,742	0
Consumer Home Equity Lines Financing Receivable [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	4,763	0
Unpaid Principal Balance	4,763	0
Related Allowance	31	0
Average Recorded Investment	4,996	0
Consumer Credit Card Financing Receivable [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	2,202	0
Unpaid Principal Balance	2,202	0
Related Allowance	108	0
Average Recorded Investment	2,497	0
Consumer Residential Mortgages Financing Receivable [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	13,154	9,705
Unpaid Principal Balance	13,160	9,776
Related Allowance	1,364	741
Average Recorded Investment	13,155	9,713
Total impaired loans with a related allowance [Member]
Summary of impaired noncovered loans
Recorded Investment	63,279	48,082
Unpaid Principal Balance	65,168	58,966
Related Allowance	7,080	6,181
Average Recorded Investment	60,318	51,813
Commercial and Industrial [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	6,999	12,172
Unpaid Principal Balance	9,121	15,045
Related Allowance	0	0
Average Recorded Investment	8,442	12,816
Commercial Real Estate [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	29,566	34,003
Unpaid Principal Balance	46,744	40,619
Related Allowance	0	0
Average Recorded Investment	37,720	35,238
Construction [Member] | Commercial [Member]
Summary of impaired noncovered loans
Recorded Investment	7,522	10,120
Unpaid Principal Balance	13,675	14,710
Related Allowance	0	0
Average Recorded Investment	9,908	10,833
Consumer Installment [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	0	17,146
Unpaid Principal Balance	0	17,164
Related Allowance	0	0
Average Recorded Investment	0	17,313
Consumer Home Equity Lines [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	0	1,747
Unpaid Principal Balance	0	1,747
Related Allowance	0	0
Average Recorded Investment	0	1,764
Credit Card [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	0	3,081
Unpaid Principal Balance	0	3,081
Related Allowance	0	0
Average Recorded Investment	0	2,926
Consumer Residential Mortgages [Member] | Consumer [Member]
Summary of impaired noncovered loans
Recorded Investment	4,244	1,992
Unpaid Principal Balance	4,262	2,765
Related Allowance	0	0
Average Recorded Investment	4,450	2,027
Total impaired loans with no related allowance [Member]
Summary of impaired noncovered loans
Recorded Investment	48,331	80,261
Unpaid Principal Balance	73,802	95,131
Related Allowance	0	0
Average Recorded Investment	$ 60,520	$ 82,917