Investment Securities, Available-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Weighted Yield	2.71%	2.64%
Investment Securities, Amortized cost	$ 3,587,677	$ 3,063,032
Investment Securities, Gross Unrealized Gains	101,778	73,018
Investment Securities, Gross Unrealized Losses	(6,450)	(9,307)
Investment Securities, Fair Value	3,683,005	3,126,743
U.S. Government and federal agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Maturing within One Year, Weighted Yield	1.62%
Investment Securities, Maturing within One Year, Amortized Cost	201
Investment Securities, Maturing within One Year, Gross Unrealized Gains	1
Investment Securities, Maturing within One Year, Fair Value	202
Investment Securities, Maturing after One Through Five Year, Weighted Yield		1.62%
Investment Securities, Maturing after One Through Five Years, Amortized Cost		204
Investment Securities, Maturing after One Through Five Years Gross Unrealized Gains		4
Investment Securities, Maturing after One Through Five Years, Fair Value		208
U.S. Government sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Maturing within One Year, Weighted Yield		1.58%
Investment Securities, Maturing within One Year, Amortized Cost		3,979
Investment Securities, Maturing within One Year, Gross Unrealized Gains		17
Investment Securities, Maturing within One Year, Fair Value		3,996
Investment Securities, Maturing after One Through Five Year, Weighted Yield	2.30%	2.36%
Investment Securities, Maturing after One Through Five Years, Amortized Cost	17,064	26,399
Investment Securities, Maturing after One Through Five Years Gross Unrealized Gains	371	682
Investment Securities, Maturing after One Through Five Years, Fair Value	17,435	27,081
Investment Securities, Maturing after Five Through Ten Years, Weighted Yield	2.03%	1.90%
Investment Securities, Maturing after Five Through Ten Years, Amortized Cost	44	78
Investment Securities, Maturing after Five Through Ten Years Gross Unrealized Gains	1
Investment Securities, Maturing after Five Through Ten Years, Fair Value	45	78
Investment Securities, Weighted Yield	2.29%	2.26%
Investment Securities, Amortized cost	17,108	30,456
Investment Securities, Gross Unrealized Gains	372	699
Investment Securities, Gross Unrealized Losses		0
Investment Securities, Fair Value	17,480	31,155
State and local governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Maturing within One Year, Weighted Yield	2.01%	1.31%
Investment Securities, Maturing within One Year, Amortized Cost	4,288	4,786
Investment Securities, Maturing within One Year, Gross Unrealized Gains	28	3
Investment Securities, Maturing within One Year, Gross Unrealized Losses	(2)	(2)
Investment Securities, Maturing within One Year, Fair Value	4,314	4,787
Investment Securities, Maturing after One Through Five Year, Weighted Yield	2.11%	2.22%
Investment Securities, Maturing after One Through Five Years, Amortized Cost	149,497	89,752
Investment Securities, Maturing after One Through Five Years Gross Unrealized Gains	4,142	2,660
Investment Securities, Maturing after One Through Five Years, Gross Unrealized Losses	(142)	(22)
Investment Securities, Maturing after One Through Five Years, Fair Value	153,497	92,390
Investment Securities, Maturing after Five Through Ten Years, Weighted Yield	2.95%	2.59%
Investment Securities, Maturing after Five Through Ten Years, Amortized Cost	38,346	63,143
Investment Securities, Maturing after Five Through Ten Years Gross Unrealized Gains	1,102	2,094
Investment Securities, Maturing after Five Through Ten Years, Gross Unrealized Losses	(99)	(19)
Investment Securities, Maturing after Five Through Ten Years, Fair Value	39,349	65,218
Investment Securities, Maturing after Ten Years, Weighted Yield	4.70%	4.84%
Investment Securities, Maturing after Ten Years, Amortized Cost	935,897	845,657
Investment Securities, Maturing after Ten Years, Gross Unrealized Gains	82,823	57,138
Investment Securities, Maturing after Ten Years, Gross Unrealized Losses	(1,362)	(535)
Investment Securities, Maturing after Ten Years, Fair Value	1,017,358	902,260
Investment Securities, Weighted Yield	4.29%	4.44%
Investment Securities, Amortized cost	1,128,028	1,003,338
Investment Securities, Gross Unrealized Gains	88,095	61,895
Investment Securities, Gross Unrealized Losses	(1,605)	(578)
Investment Securities, Fair Value	1,214,518	1,064,655
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Maturing within One Year, Weighted Yield	1.73%
Investment Securities, Maturing within One Year, Amortized Cost	18,412
Investment Securities, Maturing within One Year, Gross Unrealized Gains	51
Investment Securities, Maturing within One Year, Gross Unrealized Losses	0
Investment Securities, Maturing within One Year, Fair Value	18,463
Investment Securities, Maturing after One Through Five Year, Weighted Yield	2.22%	2.55%
Investment Securities, Maturing after One Through Five Years, Amortized Cost	250,027	60,810
Investment Securities, Maturing after One Through Five Years Gross Unrealized Gains	4,018	261
Investment Securities, Maturing after One Through Five Years, Gross Unrealized Losses	(238)	(1,264)
Investment Securities, Maturing after One Through Five Years, Fair Value	253,807	59,807
Investment Securities, Maturing after Five Through Ten Years, Weighted Yield	2.23%	2.38%
Investment Securities, Maturing after Five Through Ten Years, Amortized Cost	16,144	2,409
Investment Securities, Maturing after Five Through Ten Years Gross Unrealized Gains	381	21
Investment Securities, Maturing after Five Through Ten Years, Gross Unrealized Losses	0
Investment Securities, Maturing after Five Through Ten Years, Fair Value	16,525	2,430
Investment Securities, Weighted Yield	2.19%	2.54%
Investment Securities, Amortized cost	284,583	63,219
Investment Securities, Gross Unrealized Gains	4,450	282
Investment Securities, Gross Unrealized Losses	(238)	(1,264)
Investment Securities, Fair Value	288,795	62,237
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Maturing after Ten Years, Weighted Yield	8.03%	8.03%
Investment Securities, Maturing after Ten Years, Amortized Cost	1,708	5,648
Investment Securities, Maturing after Ten Years, Gross Unrealized Losses	0	(282)
Investment Securities, Maturing after Ten Years, Fair Value	1,708	5,366
Residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Securities, Weighted Yield	1.95%	1.70%
Investment Securities, Amortized cost	2,156,049	1,960,167
Investment Securities, Gross Unrealized Gains	8,860	10,138
Investment Securities, Gross Unrealized Losses	(4,607)	(7,183)
Investment Securities, Fair Value	$ 2,160,302	$ 1,963,122

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