Securities Available for Sale and Held to Maturity (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Available for sale securities [Abstract]
Amortized cost	$ 2,342,853		$ 2,342,853		$ 2,143,074
Gross unrealized gains	60,496		60,496		50,079
Gross unrealized (losses)	(4,307)		(4,307)		(15,904)
Estimated fair value	2,399,042		2,399,042		2,177,249
Held to maturity securities [Abstract]
Amortized cost	87,923		87,923		140,847
Gross unrealized gains	4,229		4,229		4,308
Gross unrealized (losses)	(3)		(3)		(12)
Estimated fair value	92,149		92,149		145,143
Fair value [Abstract]
Estimated fair value, less than 12 months	399,916		399,916		718,579
Estimated fair value, 12 months or more	303		303		307
Total estimated fair value	400,219		400,219		718,886
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(4,302)		(4,302)		(15,911)
Gross unrealized (losses), 12 months or more	(8)		(8)		(5)
Total gross unrealized (losses)	(4,310)		(4,310)		(15,916)
Proceeds from sales of securities	22,996	52,621	22,996	65,074
Proceeds from calls of securities	0	2,045	1,290	3,750
Gain (Loss) on Investments [Line Items]
Gross realized gains	51	1,855	58	2,224
Available for Sale, amortized cost [Abstract]
Due in one year or less	35,726		35,726
Due after one year through five years	47,562		47,562
Due after five years through ten years	188,751		188,751
Due after ten years	11,683		11,683
Total amortized cost, before mortgage-backed-securities	283,722		283,722
Mortgage-backed securities	2,059,131		2,059,131
Total amortized cost	2,342,853		2,342,853
Available for Sale, estimated fair value [Abstract]
Due in one year or less	35,785		35,785
Due after one year through five years	49,201		49,201
Due after five years through ten years	192,264		192,264
Due after ten years	11,731		11,731
Total fair value, before mortgage-backed-securities	288,981		288,981
Mortgage-backed securities	2,110,061		2,110,061
Securities available for sale (at fair value)	2,399,042		2,399,042		2,177,249
Held to maturity, amortized cost [Abstract]
Due in one year or less	3,162		3,162
Due after one year through five years	15,640		15,640
Due after five years through ten years	20,273		20,273
Due after ten years	7,856		7,856
Total amortized cost, before mortgage-backed-securities	46,931		46,931
Mortgage-backed securities	40,992		40,992
Securities held to maturity	87,923		87,923		140,847
Held to maturity, estimated fair value [Abstract]
Due in one year or less	3,189		3,189
Due after one year through five years	16,211		16,211
Due after five years through ten years	22,062		22,062
Due after ten years	8,791		8,791
Total fair value, before mortgage-backed-securities	50,253		50,253
Mortgage-backed securities	41,896		41,896
Securities held to maturity (at fair value)	92,149		92,149
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
Held to maturity securities [Abstract]
Amortized cost	0		0		0
Gross unrealized gains	0		0		0
Gross unrealized (losses)	0		0		0
Estimated fair value	0		0		0
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
Available for sale securities [Abstract]
Amortized cost	7		7		12
Gross unrealized gains	0		0		0
Gross unrealized (losses)	0		0		0
Estimated fair value	7		7		12
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
Held to maturity securities [Abstract]
Amortized cost	0		0		0
Gross unrealized gains	0		0		0
Gross unrealized (losses)	0		0		0
Estimated fair value	0		0		0
Fair value [Abstract]
Estimated fair value, less than 12 months	64,790		64,790		86,917
Estimated fair value, 12 months or more	0		0		0
Total estimated fair value	64,790		64,790		86,917
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(685)		(685)		(2,184)
Gross unrealized (losses), 12 months or more	0		0		0
Total gross unrealized (losses)	(685)		(685)		(2,184)
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
Available for sale securities [Abstract]
Amortized cost	103,302		103,302		124,093
Gross unrealized gains	323		323		114
Gross unrealized (losses)	(685)		(685)		(2,184)
Estimated fair value	102,940		102,940		122,023
Obligations of States and Political Subdivisions [Member]
Held to maturity securities [Abstract]
Amortized cost	46,931		46,931		53,246
Gross unrealized gains	3,325		3,325		2,628
Gross unrealized (losses)	(3)		(3)		(10)
Estimated fair value	50,253		50,253		55,864
Fair value [Abstract]
Estimated fair value, less than 12 months	16,616		16,616		65,523
Estimated fair value, 12 months or more	303		303		307
Total estimated fair value	16,919		16,919		65,830
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(188)		(188)		(2,045)
Gross unrealized (losses), 12 months or more	(8)		(8)		(5)
Total gross unrealized (losses)	(196)		(196)		(2,050)
Obligations of States and Political Subdivisions [Member]
Available for sale securities [Abstract]
Amortized cost	180,413		180,413		159,418
Gross unrealized gains	5,814		5,814		2,259
Gross unrealized (losses)	(193)		(193)		(2,040)
Estimated fair value	186,034		186,034		159,637
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Held to maturity securities [Abstract]
Amortized cost	5,547		5,547		6,058
Gross unrealized gains	261		261		171
Gross unrealized (losses)	0		0		0
Estimated fair value	5,808		5,808		6,229
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Available for sale securities [Abstract]
Amortized cost	14,125		14,125		11,719
Gross unrealized gains	865		865		723
Gross unrealized (losses)	0		0		0
Estimated fair value	14,990		14,990		12,442
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Held to maturity securities [Abstract]
Amortized cost	0		0		0
Gross unrealized gains	0		0		0
Gross unrealized (losses)	0		0		0
Estimated fair value	0		0		0
Fair value [Abstract]
Estimated fair value, less than 12 months	282,872		282,872		312,787
Estimated fair value, 12 months or more	0		0		0
Total estimated fair value	282,872		282,872		312,787
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(3,112)		(3,112)		(6,846)
Gross unrealized (losses), 12 months or more	0		0		0
Total gross unrealized (losses)	(3,112)		(3,112)		(6,846)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Available for sale securities [Abstract]
Amortized cost	413,754		413,754		432,162
Gross unrealized gains	2,851		2,851		1,188
Gross unrealized (losses)	(3,112)		(3,112)		(6,846)
Estimated fair value	413,493		413,493		426,504
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Held to maturity securities [Abstract]
Amortized cost	32,456		32,456		78,526
Gross unrealized gains	594		594		1,503
Gross unrealized (losses)	0		0		0
Estimated fair value	33,050		33,050		80,029
Fair value [Abstract]
Estimated fair value, less than 12 months	19,341		19,341		232,279
Estimated fair value, 12 months or more	0		0		0
Total estimated fair value	19,341		19,341		232,279
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(126)		(126)		(4,311)
Gross unrealized (losses), 12 months or more	0		0		0
Total gross unrealized (losses)	(126)		(126)		(4,311)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Available for sale securities [Abstract]
Amortized cost	1,509,675		1,509,675		1,361,339
Gross unrealized gains	47,127		47,127		43,788
Gross unrealized (losses)	(126)		(126)		(4,311)
Estimated fair value	1,556,676		1,556,676		1,400,816
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Held to maturity securities [Abstract]
Amortized cost	2,989		2,989		3,017
Gross unrealized gains	49		49		6
Gross unrealized (losses)	0		0		(2)
Estimated fair value	3,038		3,038		3,021
Fair value [Abstract]
Estimated fair value, less than 12 months	16,297		16,297		21,073
Estimated fair value, 12 months or more	0		0		0
Total estimated fair value	16,297		16,297		21,073
Gross unrealized losses [Abstract]
Gross unrealized (losses), less than 12 months	(191)		(191)		(525)
Gross unrealized (losses), 12 months or more	0		0		0
Total gross unrealized (losses)	(191)		(191)		(525)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Available for sale securities [Abstract]
Amortized cost	121,577		121,577		54,331
Gross unrealized gains	3,516		3,516		2,007
Gross unrealized (losses)	(191)		(191)		(523)
Estimated fair value	124,902		124,902		55,815
Available-for-sale Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	51	1,852	51	2,216
Held-to-maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	$ 0	$ 3	$ 7	$ 8

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The cash inflow associated with the maturity calls (requests for early payments) of debt securities designated as held-to-maturity.

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Total investments in debt securities, excluding mortgage-back-securities, which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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Total investments in debt and equity securities, excluding mortgage-back-securities, which are categorized neither as held-to-maturity nor trading.

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