Derivative Financial Instruments (Net Impact On Interest Expense Related To Cash Flow Hedges) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Interest Expense					$ 667
Deferred Loss (Gain)	23,032	30,255	47,319	60,994	3,439
Net Impact					4,106
Interest Income	0	0	0	0
MTM Gain	0	0	0	0
Deferred Gain	(800)	(1,420)	(1,806)	(3,006)
Net Impact	(800)	(1,420)	(1,806)	(3,006)
Interest rate swap on FHLB advances [Member]
Derivative [Line Items]
Interest Expense					667
Deferred Loss (Gain)					2,278
Net Impact					2,945
Interest rate swaps on subordinated debt [Member]
Derivative [Line Items]
Interest Expense					0
Deferred Loss (Gain)					(49)
Net Impact					(49)
Interest Income	0	0	0	0
MTM Gain	0	0	0	0
Deferred Gain	0	(620)	(207)	(1,407)
Net Impact	0	(620)	(207)	(1,407)
Interest rate swaps repurchase agreement [Member]
Derivative [Line Items]
Interest Expense					0
Deferred Loss (Gain)					1,299
Net Impact					1,299
Interest rate swaps on Trust Preferred Securities [Member]
Derivative [Line Items]
Interest Expense					0
Deferred Loss (Gain)					(89)
Net Impact					(89)
Interest rate swaps on senior notes [Member]
Derivative [Line Items]
Interest Income	0	0	0	0
MTM Gain	0	0	0	0
Deferred Gain	(800)	(800)	(1,599)	(1,599)
Net Impact	(800)	(800)	(1,599)	(1,599)
Reclassification out of accumualted comprehensive income [Member]
Derivative [Line Items]
Interest Expense	118	336	498
Deferred Loss (Gain)	2,349	1,903	4,908
Net Impact	2,467	2,239	5,406
Reclassification out of accumualted comprehensive income [Member] | Interest rate swap on FHLB advances [Member]
Derivative [Line Items]
Interest Expense	118	336	498
Deferred Loss (Gain)	1,519	1,139	3,251
Net Impact	1,637	1,475	3,749
Reclassification out of accumualted comprehensive income [Member] | Interest rate swaps on subordinated debt [Member]
Derivative [Line Items]
Interest Expense	0	0	0
Deferred Loss (Gain)	0	(22)	(3)
Net Impact	0	(22)	(3)
Reclassification out of accumualted comprehensive income [Member] | Interest rate swaps repurchase agreement [Member]
Derivative [Line Items]
Interest Expense	0	0	0
Deferred Loss (Gain)	830	830	1,660
Net Impact	830	830	1,660
Reclassification out of accumualted comprehensive income [Member] | Interest rate swaps on Trust Preferred Securities [Member]
Derivative [Line Items]
Interest Expense	0	0	0
Deferred Loss (Gain)	0	(44)	0
Net Impact	$ 0	$ (44)	$ 0