Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 holding		Dec. 31, 2012 holding
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	$ 893,274		$ 405,620
Available for Sale, Unrealized Losses - Less Than Twelve Months	(33,409)		(1,436)
Available for Sale, Fair Value - Twelve Months or Longer	330,990		91,531
Available for Sale, Unrealized Losses - Twelve Months or Longer	(28,217)		(30,053)
Available for Sale, Number of Holdings	123		54
Available for Sale, Fair Value - Total	1,224,264		497,151
Available-for-sale Securities, Unrealized Losses , Total	(61,626)		(31,489)
Held-to-maturity, Fair Value - Less Than Twelve Months	1,342,814		185,788
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(49,260)		(533)
Held-to-maturity, Fair Value - Twelve Months or Longer	187,778		2,858
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	(11,958)		(59)
Held-to-maturity, Number of holdings	164		24
Held-to-maturity, Fair Value - Total	1,530,592		188,646
Held-to-maturity Securities, unrealized losses, Total	(61,218)		(592)
Total investment securities in an unrealized loss position at Fair Value Less Than Twelve Months	2,236,088		591,408
Total investment securities in an unrealized loss position, Unrealized Losses Less Than Twelve Months	(82,669)		(1,969)
Total investment securities in an unrealized loss position at Fair Value Twelve Months Or Longer	518,768		94,389
Total investment securities in an unrealized loss position, Unrealized Losses Twelve Months Or Longer	(40,175)		(30,112)
Total investment securities in an unrealized loss position, Number of Holdings	287		78
Total investment securities in an unrealized loss position, Fair Value, Total	2,754,856		685,797
Total investment securities in an unrealized loss position, Unrealized Losses	(122,844)		(32,081)
Agency CMOs [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	149,894		69,936
Available for Sale, Unrealized Losses - Less Than Twelve Months	(1,713)		(92)
Available for Sale, Fair Value - Twelve Months or Longer	9,011
Available for Sale, Unrealized Losses - Twelve Months or Longer	(155)
Available for Sale, Number of Holdings	15		4
Available for Sale, Fair Value - Total	158,905		69,936
Available-for-sale Securities, Unrealized Losses , Total	(1,868)		(92)
Held-to-maturity, Fair Value - Less Than Twelve Months	53,789		18,741
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(1,009)		(8)
Held-to-maturity, Fair Value - Twelve Months or Longer	0		0
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	0		0
Held-to-maturity, Number of holdings	4		1
Held-to-maturity, Fair Value - Total	53,789		18,741
Held-to-maturity Securities, unrealized losses, Total	(1,009)		(8)
Agency MBS [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	616,286		275,818
Available for Sale, Unrealized Losses - Less Than Twelve Months	(29,537)		(1,098)
Available for Sale, Fair Value - Twelve Months or Longer	279,680
Available for Sale, Unrealized Losses - Twelve Months or Longer	(18,161)
Available for Sale, Number of Holdings	88		28
Available for Sale, Fair Value - Total	895,966		275,818
Available-for-sale Securities, Unrealized Losses , Total	(47,698)		(1,098)
Held-to-maturity, Fair Value - Less Than Twelve Months	1,045,693		161,057
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(42,181)		(474)
Held-to-maturity, Fair Value - Twelve Months or Longer	170,780
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	(11,007)
Held-to-maturity, Number of holdings	94		12
Held-to-maturity, Fair Value - Total	1,216,473		161,057
Held-to-maturity Securities, unrealized losses, Total	(53,188)		(474)
Agency CMBS [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	70,977
Available for Sale, Unrealized Losses - Less Than Twelve Months	(782)
Available for Sale, Fair Value - Twelve Months or Longer	0
Available for Sale, Unrealized Losses - Twelve Months or Longer	0
Available for Sale, Number of Holdings	3
Available for Sale, Fair Value - Total	70,977
Available-for-sale Securities, Unrealized Losses , Total	(782)
Held-to-maturity, Fair Value - Less Than Twelve Months	90,218
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(818)
Held-to-maturity, Fair Value - Twelve Months or Longer	0
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	0
Held-to-maturity, Number of holdings	4
Held-to-maturity, Fair Value - Total	90,218
Held-to-maturity Securities, unrealized losses, Total	(818)
CMBS [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	52,340		14,947
Available for Sale, Unrealized Losses - Less Than Twelve Months	(996)		(17)
Available for Sale, Fair Value - Twelve Months or Longer			20,909
Available for Sale, Unrealized Losses - Twelve Months or Longer			(3,476)
Available for Sale, Number of Holdings	7		2
Available for Sale, Fair Value - Total	52,340		35,856
Available-for-sale Securities, Unrealized Losses , Total	(996)		(3,493)
Held-to-maturity, Fair Value - Less Than Twelve Months	106,527
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(4,059)
Held-to-maturity, Fair Value - Twelve Months or Longer	14,832
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	(916)
Held-to-maturity, Number of holdings	11
Held-to-maturity, Fair Value - Total	121,359
Held-to-maturity Securities, unrealized losses, Total	(4,975)		0
Collateralized Loan Obligations [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months			44,775
Available for Sale, Unrealized Losses - Less Than Twelve Months			(225)
Available for Sale, Fair Value - Twelve Months or Longer			0
Available for Sale, Unrealized Losses - Twelve Months or Longer			0
Available for Sale, Number of Holdings			2
Available for Sale, Fair Value - Total			44,775
Available-for-sale Securities, Unrealized Losses , Total	(2,600)	[1]	(225)
Pooled trust preferred securities [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months
Available for Sale, Unrealized Losses - Less Than Twelve Months
Available for Sale, Fair Value - Twelve Months or Longer	11,141		26,207
Available for Sale, Unrealized Losses - Twelve Months or Longer	(3,410)		(19,811)
Available for Sale, Number of Holdings	2		8
Available for Sale, Fair Value - Total	11,141		26,207
Available-for-sale Securities, Unrealized Losses , Total	(3,410)	[2]	(19,811)	[3]
Single issuer trust preferred securities [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	3,777
Available for Sale, Unrealized Losses - Less Than Twelve Months	(381)
Available for Sale, Fair Value - Twelve Months or Longer	31,158		44,415
Available for Sale, Unrealized Losses - Twelve Months or Longer	(6,491)		(6,766)
Available for Sale, Number of Holdings	8		9
Available for Sale, Fair Value - Total	34,935		44,415
Available-for-sale Securities, Unrealized Losses , Total	(6,872)		(6,766)
Equity securities - financial institutions [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months			144
Available for Sale, Unrealized Losses - Less Than Twelve Months			(4)
Available for Sale, Fair Value - Twelve Months or Longer
Available for Sale, Unrealized Losses - Twelve Months or Longer
Available for Sale, Number of Holdings			1
Available for Sale, Fair Value - Total			144
Available-for-sale Securities, Unrealized Losses , Total	0	[4]	(4)	[5]
Municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Fair Value - Less Than Twelve Months	46,587		5,990
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(1,193)		(51)
Held-to-maturity, Fair Value - Twelve Months or Longer	2,166		2,858
Held-to-maturity, Unrealized Losses - Twelve Months or Longer	(35)		(59)
Held-to-maturity, Number of holdings	51		11
Held-to-maturity, Fair Value - Total	48,753		8,848
Held-to-maturity Securities, unrealized losses, Total	$ (1,228)		$ (110)

[1] Amortized cost is net of $2.6 million of other-than-temporary impairment at December 31, 2013.

[2] Amortized cost is net of $14.0 million of other-than-temporary impairment at December 31, 2013

[3] Amortized cost is net of $10.5 million of credit related other-than-temporary impairment at December 31, 2012.

[4] Amortized cost is net of $20.4 million of other-than-temporary impairment at December 31, 2013.

[5] Amortized cost is net of $21.3 million of other-than-temporary impairment at December 31, 2012.