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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Amortized Cost and Estimated fair value of investment securities
Amortized cost	$ 2,301,303	$ 2,130,029
Gross Unrealized Holding Gain	73,238	72,703
Gross Unrealized Holding Loss	(1,812)	(1,206)
Available-for-sale Securities, Total	2,372,729	2,201,526
Total Percent	100.00%	100.00%
Government agency & government-sponsored enterprises [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	37,191	46,273
Gross Unrealized Holding Gain	175	234
Gross Unrealized Holding Loss	(4)
Available-for-sale Securities, Total	37,362	46,507
Total Percent	1.57%	2.11%
Residential mortgage-backed securities[Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	918,726	869,847
Gross Unrealized Holding Gain	20,300	18,487
Gross Unrealized Holding Loss	(135)	(334)
Available-for-sale Securities, Total	938,891	888,000
Total Percent	39.58%	40.33%
CMO's / REMIC's - Residential [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	729,815	594,866
Gross Unrealized Holding Gain	10,437	10,307
Gross Unrealized Holding Loss	(1,050)	(665)
Available-for-sale Securities, Total	739,202	604,508
Total Percent	31.15%	27.46%
Municipal Bonds [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	605,114	608,575
Gross Unrealized Holding Gain	42,251	43,665
Gross Unrealized Holding Loss	(623)	(203)
Available-for-sale Securities, Total	646,742	652,037
Total Percent	27.26%	29.62%
Other Securities [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	10,457	10,468
Gross Unrealized Holding Gain	75	10
Gross Unrealized Holding Loss		(4)
Available-for-sale Securities, Total	$ 10,532	$ 10,474
Total Percent	0.44%	0.48%

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