Consolidated Statements of Earnings and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest income:
Loans held-for-sale	$ 56	$ 54	$ 5
Loans and leases, including fees	194,448	213,932	206,074
Accelerated accretion on acquired loans	12,586	26,740
Loans, including fees	207,090	240,726	206,079
Investment securities:
Taxable	37,310	49,720	76,798
Tax-advantaged	23,640	25,394	27,329
Total investment income	60,950	75,114	104,127
Dividends from FHLB	242	324	195
Federal funds sold	995	868	343
Interest-bearing deposits with other institutions	443	257	15
Total interest income	269,720	317,289	310,759
Interest expense:
Deposits	8,708	18,253	24,956
Borrowings	23,002	36,354	59,572
Junior subordinated debentures	3,329	3,365	3,967
Total interest expense	35,039	57,972	88,495
Net interest income before provision for credit losses	234,681	259,317	222,264
Provision for credit losses	7,068	61,200	80,500
Net interest income after provision for credit losses	227,613	198,117	141,764
Other operating income:
Impairment loss on investment securities	(254)	(317)	(1,994)
Plus: Reclassification of credit-related impairment loss from other comprehensive income	(402)	(587)	1,671
Net impairment loss on investment securities recognized in earnings	(656)	(904)	(323)
Service charges on deposit accounts	15,768	16,745	14,889
Trust and Investment Services	8,683	8,363	6,657
Bankcard services	3,144	2,776	2,338
BOLI Income	3,259	3,125	2,792
Gain on sale of securities, net		38,900	28,446
Increase (decrease) in FDIC loss sharing asset, net	171	(15,856)	1,398
Gain from SJB acquisition			21,122
Other	3,847	3,965	5,150
Total other operating income	34,216	57,114	81,071
Other operating expense:
Salaries and employee benefits	69,993	69,419	62,985
Professional services	15,031	13,308	6,965
Occupancy and equipment	16,583	19,348	18,361
Software licenses and maintenance	3,669	5,031	2,320
Promotion	4,977	6,084	6,528
Amortization of Intangibles	3,481	3,732	3,163
OREO expense	6,729	7,490	1,211
Prepayment penalties on borrowings	3,310	18,663	4,402
Other	17,252	25,417	27,651
Total other operating expenses	141,025	168,492	133,586
Earnings before income taxes	120,804	86,739	89,249
Income taxes	39,071	23,804	23,830
Net earnings	81,733	62,935	65,419
Preferred stock dividends and amortization of preferred stock discount			12,763
Net earnings allocated to common shareholders	81,733	62,935	52,656
Other comprehensive income:
Unrealized gain on securities arising during the period	61,490	3,160	24,086
Less: Reclassification adjustment for net gain on securities included in net income	(656)	(37,996)	(28,123)
Other comprehensive income ,before tax	60,834	(34,836)	(4,037)
Income tax related to items of other comprehensive income	(25,550)	14,631	1,696
Other comprehensive income, net of tax	35,284	(20,205)	(2,341)
Comprehensive income	$ 117,017	$ 42,730	$ 63,078
Basic earnings per common share	$ 0.77	$ 0.59	$ 0.56
Diluted earnings per common share	$ 0.77	$ 0.59	$ 0.56
Cash dividends per common share	$ 0.34	$ 0.34	$ 0.34