Long-Term Debt (Schedule Of Long-Term Debt) (Detail) (USD $) In Thousands, unless otherwise specified									6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended				6 Months Ended
	Jun. 30, 2012 Year	Dec. 31, 2011 Year	Sep. 30, 2010	Jun. 30, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Jun. 30, 2012 Subsidiaries [Member]	Dec. 31, 2011 Subsidiaries [Member]	Jun. 30, 2012 Three-Month LIBOR + 2.65% [Member]	Jun. 30, 2012 Three-Month LIBOR + 2.65% [Member] Parent Company [Member]		Dec. 31, 2011 Three-Month LIBOR + 2.65% [Member] Parent Company [Member]		Jun. 30, 2012 Three-Month LIBOR + 1.71% [Member]	Jun. 30, 2012 Three-Month LIBOR + 1.71% [Member] Parent Company [Member]		Dec. 31, 2011 Three-Month LIBOR + 1.71% [Member] Parent Company [Member]		Jun. 30, 2012 Three-Month LIBOR + 1.50% [Member]	Jun. 30, 2012 Three-Month LIBOR + 1.50% [Member] Parent Company [Member]		Dec. 31, 2011 Three-Month LIBOR + 1.50% [Member] Parent Company [Member]		Jun. 30, 2012 Three-Month LIBOR + 3.50% [Member]	Jun. 30, 2012 Three-Month LIBOR + 3.50% [Member] Subsidiaries [Member]		Dec. 31, 2011 Three-Month LIBOR + 3.50% [Member] Subsidiaries [Member]		Jun. 30, 2012 10.00% Junior Subordinated Debentures Due 2068 [Member] Parent Company [Member]		Dec. 31, 2011 10.00% Junior Subordinated Debentures Due 2068 [Member] Parent Company [Member]
Debt Instrument [Line Items]
Junior subordinated debentures	$ 244,793	$ 244,793		$ 244,793	$ 244,793				$ 8,248	[1],[2]	$ 8,248	[1],[2]		$ 51,547	[1],[3]	$ 51,547	[1],[3]		$ 41,238	[1],[4]	$ 41,238	[1],[4]						$ 143,760	[1]	$ 143,760	[1]
Subordinated borrowing, interest rate									3.12%	[1],[2]				2.18%	[1],[3]				1.97%	[1],[4]				3.97%	[5],[6]			10.00%	[1]
Subordinated borrowing, due date									Jun. 17, 2034	[1],[2]				Sep. 15, 2035	[1],[3]				Dec. 15, 2035	[1],[4]				Sep. 26, 2015	[5],[6]			Jun. 15, 2068	[1]
FHLB advances						10,000	15,000
Subordinated debt																								120,000	[5],[6]	120,000	[5],[6]
Total long-term debt	$ 374,793	$ 379,793				$ 130,000	$ 135,000
Weighted average interest rate of FHLB long-term advances at period end	4.15%	4.42%
Weighted average remaining maturity of FHLB long-term advances at period end (in years).	4.9	4.1
Variable interest rate								2.65%					1.71%					1.50%					3.50%
Tier I capital treatment phase out period	10 years
Percentage of reduction in balance outstanding qualified for tier II capital			20.00%
Percentage of additional reduction in balance outstanding qualified for tier II capital	20.00%
Percentage of balance qualified for Tier II capital	60.00%	60.00%

[1] Qualifies as Tier I capital for regulatory capital purposes under current guidelines. Tier I capital treatment is proposed to be phased out over a ten-year period starting in January 2013 under recently proposed capital rules that would revise and replace current regulatory capital requirements. These instruments would continue to qualify as Tier II capital under the proposal.

[2] Variable rate in effect at June 30, 2012, based on six-month LIBOR + 2.65%.

[3] Variable rate in effect at June 30, 2012, based on six-month LIBOR + 1.71%.

[4] Variable rate in effect at June 30, 2012, based on six-month LIBOR + 1.50%.

[5] Variable rate in effect at June 30, 2012, based on six-month LIBOR + 3.50%.

[6] Effective in the third quarter 2010, Tier II capital qualification was reduced by 20% of the total balance outstanding and annually thereafter is reduced by an additional 20%. As of June 30, 2012 and December 31, 2011, 60% of the balance qualified as Tier II capital for regulatory capital purposes.