Investment Securities (Amortized Cost Table) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Securities available for sale
Available-for-sale Securities, Amortized Cost	$ 3,311,751	$ 2,848,771	$ 3,135,438
Available-for-sale Securities, Gross Unrealized Gains	44,838	85,122	95,035
Available-for-sale Securities, Gross Unrealized Losses	(57,197)	(12,922)	(14,108)
Available-for-sale Securities, Fair Value	3,299,392	2,920,971	3,216,365
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	2,551,860	622,121	352,221
Held-to-maturity Securities, Unrecognized Holding Gain	4,077	8,764	3,094
Held-to-maturity Securities, Unrecognized Holding Loss	(68,866)	(86)	(195)
Held-to-maturity Securities, Fair Value	2,551,860	622,121	352,221
Held-to-maturity Securities, Fair Value	2,487,071	630,799	355,120
US Government Agencies Debt Securities [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost			35,224
Available-for-sale Securities, Gross Unrealized Gains			73
Available-for-sale Securities, Gross Unrealized Losses			0
Available-for-sale Securities, Fair Value			35,297
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	25,000
Held-to-maturity Securities, Unrecognized Holding Gain	0
Held-to-maturity Securities, Unrecognized Holding Loss	(1,193)
Held-to-maturity Securities, Fair Value	23,807
U.S. States and political subdivisions [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	272,254	253,198	249,410
Available-for-sale Securities, Gross Unrealized Gains	9,207	15,235	15,914
Available-for-sale Securities, Gross Unrealized Losses	(3,527)	(229)	(200)
Available-for-sale Securities, Fair Value	277,934	268,204	265,124
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	436,860	270,005	253,161
Held-to-maturity Securities, Unrecognized Holding Gain	3,878	5,126	3,033
Held-to-maturity Securities, Unrecognized Holding Loss	(9,041)	(70)	(119)
Held-to-maturity Securities, Fair Value	431,697	275,061	256,075
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	1,058,323	1,058,005	1,326,601
Available-for-sale Securities, Gross Unrealized Gains	27,797	49,058	56,212
Available-for-sale Securities, Gross Unrealized Losses	(10,192)	0	0
Available-for-sale Securities, Fair Value	1,075,928	1,107,063	1,382,813
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	253,839
Held-to-maturity Securities, Unrecognized Holding Gain	0
Held-to-maturity Securities, Unrecognized Holding Loss	(8,051)
Held-to-maturity Securities, Fair Value	245,788
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	58,609	52,014	37,868
Available-for-sale Securities, Gross Unrealized Gains	29	428	580
Available-for-sale Securities, Gross Unrealized Losses	(2,141)	(406)	(20)
Available-for-sale Securities, Fair Value	56,497	52,036	38,428
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	50,352	33,165	5,113
Held-to-maturity Securities, Unrecognized Holding Gain	0	812	0
Held-to-maturity Securities, Unrecognized Holding Loss	(619)	0	(29)
Held-to-maturity Securities, Fair Value	49,733	33,977	5,084
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	1,586,576	1,311,501	1,258,742
Available-for-sale Securities, Gross Unrealized Gains	7,272	18,180	18,962
Available-for-sale Securities, Gross Unrealized Losses	(27,120)	(260)	(326)
Available-for-sale Securities, Fair Value	1,566,728	1,329,421	1,277,378
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	1,510,374	123,563
Held-to-maturity Securities, Unrecognized Holding Gain	67	533
Held-to-maturity Securities, Unrecognized Holding Loss	(41,674)	(16)
Held-to-maturity Securities, Fair Value	1,468,767	124,080
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	10	11	13
Available-for-sale Securities, Gross Unrealized Gains	0	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0	0
Available-for-sale Securities, Fair Value	10	11	13
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	108,000	109,260	66,806
Available-for-sale Securities, Gross Unrealized Gains	533	2,221	1,739
Available-for-sale Securities, Gross Unrealized Losses	(1,965)	(138)	0
Available-for-sale Securities, Fair Value	106,568	111,343	68,545
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	175,384	98,924	93,947
Held-to-maturity Securities, Unrecognized Holding Gain	0	772	61
Held-to-maturity Securities, Unrecognized Holding Loss	(7,285)	0	(47)
Held-to-maturity Securities, Fair Value	168,099	99,696	93,961
Collateralized Loan Obligations [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	159,916
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	(1,821)
Available-for-sale Securities, Fair Value	158,095
Corporate debt securities [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	61,569	61,541	157,434
Available-for-sale Securities, Gross Unrealized Gains	0	0	1,555
Available-for-sale Securities, Gross Unrealized Losses	(10,431)	(11,889)	(13,562)
Available-for-sale Securities, Fair Value	51,138	49,652	145,427
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	95,052	96,464
Held-to-maturity Securities, Unrecognized Holding Gain	132	1,521
Held-to-maturity Securities, Unrecognized Holding Loss	(1,003)	0
Held-to-maturity Securities, Fair Value	94,181	97,985
Debt Securities [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	3,305,257	2,845,530	3,132,098
Available-for-sale Securities, Gross Unrealized Gains	44,838	85,122	95,035
Available-for-sale Securities, Gross Unrealized Losses	(57,197)	(12,922)	(14,108)
Available-for-sale Securities, Fair Value	3,292,898	2,917,730	3,213,025
Marketable equity securities [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	3,213
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value	3,213
Equity Securities, Other [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	3,281
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value	3,281
Equity Securities [Member]
Securities available for sale
Available-for-sale Securities, Amortized Cost	6,494	3,241	3,340
Available-for-sale Securities, Gross Unrealized Gains	0	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0	0
Available-for-sale Securities, Fair Value	6,494	3,241	3,340
US Treasury Securities [Member]
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	4,999
Held-to-maturity Securities, Unrecognized Holding Gain	0
Held-to-maturity Securities, Unrecognized Holding Loss	0
Held-to-maturity Securities, Fair Value	$ 4,999

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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