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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Amortized Cost and Estimated fair value of investment securities
Amortized cost	$ 2,184,386	$ 2,130,029
Gross Unrealized Holding Gain	76,606	72,703
Gross Unrealized Holding Loss	(1,461)	(1,206)
Available-for-sale Securities, Total	2,259,531	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	32,172	46,273
Gross Unrealized Holding Gain	190	234
Available-for-sale Securities, Total	32,362	46,507
Total Percent	1.43%	2.11%
Residential Mortgage-backed securities[Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	839,345	869,847
Gross Unrealized Holding Gain	23,977	18,487
Gross Unrealized Holding Loss		(334)
Available-for-sale Securities, Total	863,322	888,000
Total Percent	38.21%	40.33%
CMO's / REMIC's - Residential [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	709,884	594,866
Gross Unrealized Holding Gain	9,679	10,307
Gross Unrealized Holding Loss	(1,043)	(665)
Available-for-sale Securities, Total	718,520	604,508
Total Percent	31.80%	27.46%
Municipal Bonds [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	592,528	608,575
Gross Unrealized Holding Gain	42,741	43,665
Gross Unrealized Holding Loss	(418)	(203)
Available-for-sale Securities, Total	634,851	652,037
Total Percent	28.10%	29.62%
Other Securities [Member]
Amortized Cost and Estimated fair value of investment securities
Amortized cost	10,457	10,468
Gross Unrealized Holding Gain	19	10
Gross Unrealized Holding Loss		(4)
Available-for-sale Securities, Total	$ 10,476	$ 10,474
Total Percent	0.46%	0.48%

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

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