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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 2,374,816	$ 2,130,029
Gross Unrealized Holding Gain	76,539	72,703
Gross Unrealized Holding Loss	(1,968)	(1,206)
Fair Value	2,449,387	2,201,526
Total Percent	100.00%	100.00%
Government agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	357,960	46,273
Gross Unrealized Holding Gain	1,588	234
Gross Unrealized Holding Loss	(248)
Fair Value	359,300	46,507
Total Percent	14.67%	2.11%
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	862,196	869,847
Gross Unrealized Holding Gain	25,529	18,487
Gross Unrealized Holding Loss	(127)	(334)
Fair Value	887,598	888,000
Total Percent	36.24%	40.33%
CMO's / REMIC's-residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	565,968	594,866
Gross Unrealized Holding Gain	7,402	10,307
Gross Unrealized Holding Loss	(1,410)	(665)
Fair Value	571,960	604,508
Total Percent	23.35%	27.46%
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	583,692	608,575
Gross Unrealized Holding Gain	41,920	43,665
Gross Unrealized Holding Loss	(183)	(203)
Fair Value	625,429	652,037
Total Percent	25.53%	29.62%
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,000	10,468
Gross Unrealized Holding Gain	100	10
Gross Unrealized Holding Loss		(4)
Fair Value	$ 5,100	$ 10,474
Total Percent	0.21%	0.48%

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