Securities Part 3 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Number of days for interest rates to reset on variable rate municipal securities	35
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Carrying Value	$ 412,479	[1]			$ 412,479	[1]			$ 439,236	[1]
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration, Fair Value	440,638		369,247		440,638		369,247		462,657
Municipal and Other Tax Exempt Securities [Member]
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Carrying Value	126,168				126,168				128,697
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration, Fair Value	130,308				130,308				133,670
Other Debt Obligations [Member]
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Carrying Value	183,964				183,964				188,835
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration, Fair Value	204,795		203,798		204,795		203,798		208,451
Residential Mortgage Backed Securities [Member]
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Carrying Value	102,347				102,347				121,704
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration, Fair Value	105,535		165,449		105,535		165,449		120,536
U.S. agency residental mortgage backed securities - Other [Member]
Held-to-maturity, Temporarily Impaired Securities [Abstract]
Held-to-maturity, Temporarily impaired Securities, Number of Securities	0				0				5
Held-to-maturity, Temporarily impaired Securities, Fair Value [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Fair Value	0				0				92,571
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Fair Value	0				0				0
Held-to-maturity, Temporarily impaired Securities, Total, Fair Value	0				0				92,571
Held-to-maturity, Temporarily impaired Securities, Unrealized Loss [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Unrealized Loss	0				0				1,770
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Unrealized Loss	0				0				0
Held-to-maturity, Temporarily impaired Securities, Total, Unrealized Loss	0				0				1,770
Fixed Maturities Securities [Member]
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	125,747				125,747
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year	1,588				1,588
Available-for-Sale Securities, Debt Maturities, One to Five Years	55,880				55,880
Available-for-Sale Securities, Debt Maturities, Six to Ten Years	15,146				15,146
Available-for-Sale Securities, Debt Maturities, Over Ten Years	50,934				50,934
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	123,548				123,548
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year, Fair Value	1,592				1,592
Available-for-Sale Securities, Debt Maturities, One to Five YearsFair Value	57,627				57,627
Available-for-Sale Securities, Debt Maturities, Six to Ten YearsFair Value	16,049				16,049
Available-for-Sale Securities, Debt Maturities, Over Ten YearsFair Value	50,479				50,479
Available-for-Sale Securities, Fair Value	125,747				125,747
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis Weighted Average Maturity	12.63				12.63
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year Nominal Yield (in hundredths)					0.38
Available-for-Sale Securities, Debt Maturities, One to Five Years Nominal Yield (in hundredths)					1.30
Available-for-Sale Securities, Debt Maturities, Six to Ten Years Nominal Yield (in hundredths)					1.23
Available-for-Sale Securities, Debt Maturities, Over Ten Years Nominal Yield (in hundredths)					2.67	[2]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					1.85
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Carrying Value	310,132				310,132
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration, Fair Value	335,103				335,103
Available-for-sale Securities [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	10,153,162		9,303,808		10,153,162		9,303,808		9,957,205
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,395,415		9,567,008		10,395,415		9,567,008		10,179,365
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	283,564	[3]	334,343	[4]	283,564	[3]	334,343	[4]	308,297	[4]
Available-for-Sale Securities, Gross Unrealized Loss	(4,621)	[3]	(14,035)	[4]	(4,621)	[3]	(14,035)	[4]	(13,331)	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	(36,690)	[5]	(57,108)	[5]	(36,690)	[5]	(57,108)	[5]	(72,806)	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	10,153,162				10,153,162
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,395,415		9,567,008		10,395,415		9,567,008		10,179,365
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					2.70
Available-for-Sale Securities, Gross Realized Gain (Loss) Disclosures [Abstract]
Proceeds	459,610		653,921		1,451,551		1,447,073
Gross realized gains	20,481		9,122		32,166		19,602
Available-for-sale Securities, Gross Realized Losses	0		(3,654)		(7,354)		(9,232)
Related federal and state income tax expense	7,967		2,127		9,652		4,034
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	153		122		153		122		109
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	1,076,874		353,396		1,076,874		353,396		95,247
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	321,500		478,779		321,500		478,779		435,233
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	1,398,374		832,175		1,398,374		832,175		530,480
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	4,119		2,130		4,119		2,130		2,616
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	37,192		69,013		37,192		69,013		83,521
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	41,311		71,143		41,311		71,143		86,137
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	9,632,976	[6]			9,632,976	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	65,774				65,774
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	64,128				64,128
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	367,579				367,579
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	22,705				22,705
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	9,904,535	[6]			9,904,535	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	67,753				67,753
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	66,059				66,059
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	330,565				330,565
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	26,503				26,503
Available-for-sale Securities [Member] | US Treasury Securities [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	1,001		1,001		1,001		1,001		1,001
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	1,003		1,003		1,003		1,003		1,006
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	3	[3]	2	[3]	3	[3]	2	[3]	5	[3]
Available-for-Sale Securities, Gross Unrealized Loss	0	[3]	0	[3]	0	[3]	0	[3]	0	[3]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year	1,001				1,001
Available-for-Sale Securities, Debt Maturities, One to Five Years
Available-for-Sale Securities, Debt Maturities, Six to Ten Years
Available-for-Sale Securities, Debt Maturities, Over Ten Years		[2]				[2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	1,001				1,001
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year, Fair Value	1,003				1,003
Available-for-Sale Securities, Debt Maturities, One to Five YearsFair Value
Available-for-Sale Securities, Debt Maturities, Six to Ten YearsFair Value
Available-for-Sale Securities, Debt Maturities, Over Ten YearsFair Value		[2]				[2]
Available-for-Sale Securities, Fair Value	1,003		1,003		1,003		1,003		1,006
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis Weighted Average Maturity	0.86	[7]			0.86	[7]
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year Nominal Yield (in hundredths)					0.55	[8]
Available-for-Sale Securities, Debt Maturities, One to Five Years Nominal Yield (in hundredths)						[8]
Available-for-Sale Securities, Debt Maturities, Six to Ten Years Nominal Yield (in hundredths)						[8]
Available-for-Sale Securities, Debt Maturities, Over Ten Years Nominal Yield (in hundredths)						[2],[8]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					0.55	[8]
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	1,001	[6]			1,001	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	1,003	[6]			1,003	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Municipal and Other Tax Exempt Securities [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	86,808		68,502		86,808		68,502		66,435
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	88,458		70,210		88,458		70,210		68,837
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	2,430	[3]	2,375	[4]	2,430	[3]	2,375	[4]	2,543	[4]
Available-for-Sale Securities, Gross Unrealized Loss	187	[3]	146	[4]	187	[3]	146	[4]	141	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	593	[5]	521	[5]	593	[5]	521	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year	587				587
Available-for-Sale Securities, Debt Maturities, One to Five Years	25,541				25,541
Available-for-Sale Securities, Debt Maturities, Six to Ten Years	15,146				15,146
Available-for-Sale Securities, Debt Maturities, Over Ten Years	45,534	[2]			45,534	[2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	86,808				86,808
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year, Fair Value	589				589
Available-for-Sale Securities, Debt Maturities, One to Five YearsFair Value	26,729				26,729
Available-for-Sale Securities, Debt Maturities, Six to Ten YearsFair Value	16,049				16,049
Available-for-Sale Securities, Debt Maturities, Over Ten YearsFair Value	45,091	[2]			45,091	[2]
Available-for-Sale Securities, Fair Value	88,458		70,210		88,458		70,210		68,837
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis Weighted Average Maturity	15.20	[7]			15.20	[7]
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year Nominal Yield (in hundredths)					0.09	[8]
Available-for-Sale Securities, Debt Maturities, One to Five Years Nominal Yield (in hundredths)					0.71	[8]
Available-for-Sale Securities, Debt Maturities, Six to Ten Years Nominal Yield (in hundredths)					1.23	[8]
Available-for-Sale Securities, Debt Maturities, Over Ten Years Nominal Yield (in hundredths)					2.78	[2],[8]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					1.88	[8]
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	66		51		66		51		26
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	21,950		24,065		21,950		24,065		5,008
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	27,864		19,593		27,864		19,593		21,659
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	49,814		43,658		49,814		43,658		26,667
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	640		301		640		301		7
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	140		366		140		366		134
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	780		667		780		667		141
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	60,374				60,374
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	11,618				11,618
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	13,396				13,396
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	1,420				1,420
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	62,365				62,365
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	11,730				11,730
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	12,804				12,804
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	1,559				1,559
Available-for-sale Securities [Member] | Other Debt Obligations [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	35,739		5,900		35,739		5,900		36,298
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	36,286		5,893		36,286		5,893		36,495
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	559	[3]	0	[4]	559	[3]	0	[4]	197	[4]
Available-for-Sale Securities, Gross Unrealized Loss	12	[3]	7	[4]	12	[3]	7	[4]	0	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year
Available-for-Sale Securities, Debt Maturities, One to Five Years	30,339				30,339
Available-for-Sale Securities, Debt Maturities, Six to Ten Years
Available-for-Sale Securities, Debt Maturities, Over Ten Years	5,400	[2]			5,400	[2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	35,739				35,739
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year, Fair Value
Available-for-Sale Securities, Debt Maturities, One to Five YearsFair Value	30,898				30,898
Available-for-Sale Securities, Debt Maturities, Six to Ten YearsFair Value
Available-for-Sale Securities, Debt Maturities, Over Ten YearsFair Value	5,388	[2]			5,388	[2]
Available-for-Sale Securities, Fair Value	36,286		5,893		36,286		5,893		36,495
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis Weighted Average Maturity	6.96	[7]			6.96	[7]
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Less Than One Year Nominal Yield (in hundredths)
Available-for-Sale Securities, Debt Maturities, One to Five Years Nominal Yield (in hundredths)					1.80
Available-for-Sale Securities, Debt Maturities, Six to Ten Years Nominal Yield (in hundredths)
Available-for-Sale Securities, Debt Maturities, Over Ten Years Nominal Yield (in hundredths)					1.71	[2]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					1.79
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	2		2		2		2
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	988		993		988		993
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	988		993		988		993
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0		0		0		0
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	12		7		12		7
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	12		7		12		7
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	5,400				5,400
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	30,339				30,339
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	5,388				5,388
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	30,898				30,898
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	9,986,158		9,170,211		9,986,158		9,170,211		9,800,457
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,221,293		9,407,011		10,221,293		9,407,011		10,007,343
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	274,772	[3]	307,267	[4]	274,772	[3]	307,267	[4]	290,795	[4]
Available-for-Sale Securities, Gross Unrealized Loss	(3,540)	[3]	(13,880)	[4]	(3,540)	[3]	(13,880)	[4]	(11,103)	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	(36,097)	[5]	(56,587)	[5]	(36,097)	[5]	(56,587)	[5]	(72,806)	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	9,986,158				9,986,158
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,221,293		9,407,011		10,221,293		9,407,011		10,007,343
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Average Expected Life of Mortgage Backed Security	2.0				2.0
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	68		68		68		68		70
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	1,041,628		329,118		1,041,628		329,118		78,871
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	292,648		458,193		292,648		458,193		411,023
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	1,334,276		787,311		1,334,276		787,311		489,894
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	2,597		1,827		2,597		1,827		849
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	37,040		68,640		37,040		68,640		83,060
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	39,637		70,467		39,637		70,467		83,909
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	9,631,975	[6]			9,631,975	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	354,183				354,183
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	9,903,532	[6]			9,903,532	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	317,761				317,761
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | US Government Agencies Debt Securities [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	9,631,975		8,588,908		9,631,975		8,588,908		9,297,389
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	9,903,532		8,893,789		9,903,532		8,893,789		9,588,177
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	274,154	[3]	306,708	[4]	274,154	[3]	306,708	[4]	290,795	[4]
Available-for-Sale Securities, Gross Unrealized Loss	(2,597)	[3]	(1,827)	[4]	(2,597)	[3]	(1,827)	[4]	(7)	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	9,631,975				9,631,975
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	9,903,532		8,893,789		9,903,532		8,893,789		9,588,177
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	25		9		25		9		3
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	1,041,628		329,118		1,041,628		329,118		70,729
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0		0
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	1,041,628		329,118		1,041,628		329,118		70,729
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	2,597		1,827		2,597		1,827		7
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	2,597		1,827		2,597		1,827		7
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	9,631,975	[6]			9,631,975	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	9,903,532	[6]			9,903,532	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | US Government Agencies Debt Securities [Member] | FNMA [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	5,270,918		5,359,939		5,270,918		5,359,939		5,823,972
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	5,426,832		5,524,849		5,426,832		5,524,849		5,987,287
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	156,699	[3]	166,016	[4]	156,699	[3]	166,016	[4]	163,319	[4]
Available-for-Sale Securities, Gross Unrealized Loss	785	[3]	1,106	[4]	785	[3]	1,106	[4]	4	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	5,270,918				5,270,918
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	5,426,832		5,524,849		5,426,832		5,524,849		5,987,287
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	13		7		13		7		2
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	528,649		230,949		528,649		230,949		68,657
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0		0
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	528,649		230,949		528,649		230,949		68,657
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	785		1,106		785		1,106		4
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	785		1,106		785		1,106		4
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	5,270,918	[6]			5,270,918	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	5,426,832	[6]			5,426,832	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | US Government Agencies Debt Securities [Member] | FHLMC [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	3,527,123		2,447,830		3,527,123		2,447,830		2,756,180
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	3,607,060		2,544,684		3,607,060		2,544,684		2,846,215
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	81,679	[3]	97,575	[4]	81,679	[3]	97,575	[4]	90,035	[4]
Available-for-Sale Securities, Gross Unrealized Loss	1,742	[3]	721	[4]	1,742	[3]	721	[4]	0	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	3,527,123				3,527,123
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	3,607,060		2,544,684		3,607,060		2,544,684		2,846,215
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	10		2		10		2		0
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	438,190		98,169		438,190		98,169		0
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0		0
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	438,190		98,169		438,190		98,169		0
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	1,742		721		1,742		721		0
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	1,742		721		1,742		721		0
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	3,527,123	[6]			3,527,123	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	3,607,060	[6]			3,607,060	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | US Government Agencies Debt Securities [Member] | GNMA [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	645,103		704,168		645,103		704,168		647,569
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	674,006		742,411		674,006		742,411		678,924
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	28,973	[3]	38,243	[4]	28,973	[3]	38,243	[4]	31,358	[4]
Available-for-Sale Securities, Gross Unrealized Loss	70	[3]	0	[4]	70	[3]	0	[4]	3	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	645,103				645,103
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	674,006		742,411		674,006		742,411		678,924
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	2		0		2		0		1
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	74,789		0		74,789		0		2,072
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0		0
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	74,789		0		74,789		0		2,072
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	70		0		70		0		3
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	70		0		70		0		3
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	645,103	[6]			645,103	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	674,006	[6]			674,006	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | US Government Agencies Debt Securities [Member] | Other Agency [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	188,831		76,971		188,831		76,971		69,668
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	195,634		81,845		195,634		81,845		75,751
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	6,803	[3]	4,874	[4]	6,803	[3]	4,874	[4]	6,083	[4]
Available-for-Sale Securities, Gross Unrealized Loss	0	[3]	0	[4]	0	[3]	0	[4]	0	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	188,831				188,831
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	195,634		81,845		195,634		81,845		75,751
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	188,831	[6]			188,831	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	195,634	[6]			195,634	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | Private Issue [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	354,183		581,303		354,183		581,303		503,068
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	317,761		513,222		317,761		513,222		419,166
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	618	[3]	559	[4]	618	[3]	559	[4]	0	[4]
Available-for-Sale Securities, Gross Unrealized Loss	(943)	[3]	(12,053)	[4]	(943)	[3]	(12,053)	[4]	(11,096)	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	(36,097)	[5]	(56,587)	[5]	(36,097)	[5]	(56,587)	[5]	(72,806)	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	354,183				354,183
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	317,761		513,222		317,761		513,222		419,166
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	43	[9]	59	[10]	43	[9]	59	[10]	67	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0	[9]	0	[10]	0	[9]	0	[10]	8,142	[9]
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	292,648	[9]	458,193	[10]	292,648	[9]	458,193	[10]	411,023	[9]
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	292,648	[9]	458,193	[10]	292,648	[9]	458,193	[10]	419,165	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0	[9]	0	[10]	0	[9]	0	[10]	842	[9]
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	37,040	[9]	68,640	[10]	37,040	[9]	68,640	[10]	83,060	[10]
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	37,040	[9]	68,640	[10]	37,040	[9]	68,640	[10]	83,902	[9]
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	354,183				354,183
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	317,761				317,761
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | Private Issue [Member] | Alt A [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	134,266		195,932		134,266		195,932		168,461
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	118,414		166,757		118,414		166,757		132,242
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	0	[3]	46	[4]	0	[3]	46	[4]	0	[4]
Available-for-Sale Securities, Gross Unrealized Loss	0	[3]	104	[4]	0	[3]	104	[4]	0	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	15,852	[5]	29,117	[5]	15,852	[5]	29,117	[5]	36,219	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	134,266				134,266
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	118,414		166,757		118,414		166,757		132,242
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	16	[9]	20	[10]	16	[9]	20	[10]	19	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0	[9]	0	[10]	0	[9]	0	[10]	0	[9]
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	118,414	[9]	156,796	[10]	118,414	[9]	156,796	[10]	132,242	[9]
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	118,414	[9]	156,796	[10]	118,414	[9]	156,796	[10]	132,242	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0	[9]	0	[10]	0	[9]	0	[10]	0	[9]
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	15,852	[9]	29,221	[10]	15,852	[9]	29,221	[10]	36,219	[10]
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	15,852		29,221	[10]	15,852		29,221	[10]	36,219	[9]
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	134,266				134,266
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	118,414				118,414
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] | Private Issue [Member] | Jumbo A Loans [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	219,917		385,371		219,917		385,371		334,607
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	199,347		346,465		199,347		346,465		286,924
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	618	[3]	513	[4]	618	[3]	513	[4]	0	[4]
Available-for-Sale Securities, Gross Unrealized Loss	943	[3]	11,949	[4]	943	[3]	11,949	[4]	11,096	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	20,245	[5]	27,470	[5]	20,245	[5]	27,470	[5]	36,587	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	219,917				219,917
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	199,347		346,465		199,347		346,465		286,924
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	27	[9]	39	[10]	27	[9]	39	[10]	48	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0	[9]	0	[10]	0	[9]	0	[10]	8,142	[9]
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	174,234	[9]	301,397	[10]	174,234	[9]	301,397	[10]	278,781	[9]
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	174,234	[9]	301,397	[10]	174,234	[9]	301,397	[10]	286,923	[9]
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0	[9]	0	[10]	0	[9]	0	[10]	842	[9]
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	21,188	[9]	39,419	[10]	21,188	[9]	39,419	[10]	46,841	[10]
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	21,188		39,419	[10]	21,188		39,419	[10]	47,683	[9]
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	219,917				219,917
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	199,347				199,347
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Perpetual Preferred Stock [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	22,171		19,511		22,171		19,511		19,171
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	23,431		22,694		23,431		22,694		18,446
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	1,811	[3]	3,183	[4]	1,811	[3]	3,183	[4]	1,030	[4]
Available-for-Sale Securities, Gross Unrealized Loss	552	[3]	0	[4]	552	[3]	0	[4]	1,755	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	22,171				22,171
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	23,431		22,694		23,431		22,694		18,446
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	5				5				6
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	10,717				10,717				11,147
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	10,717				10,717				11,147
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	552				552				1,755
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0				0				0
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	552				552				1,755
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	22,171				22,171
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	23,431				23,431
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	0				0
Available-for-sale Securities [Member] | Equity Securities And Mutual Funds [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	21,285		38,683		21,285		38,683		33,843
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	24,944		60,197		24,944		60,197		47,238
Available-for-Sale Securities, Gross Unrealized Gain (loss) [Abstract]
Available-for-Sale Securities, Gross Unrealized Gain	3,989	[3]	21,516	[4]	3,989	[3]	21,516	[4]	13,727	[4]
Available-for-Sale Securities, Gross Unrealized Loss	330	[3]	2	[4]	330	[3]	2	[4]	332	[4]
Available-for-Sale Securities, Other Than Temporary Impairment [Abstract]
Available-for-Sale Securities, Other Than Temporary Impairment	0	[5]	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-Sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	21,285				21,285
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	24,944		60,197		24,944		60,197		47,238
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	12		1		12		1		7
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	2,579		213		2,579		213		221
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0		2,551
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	2,579		213		2,579		213		2,772
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	330		2		330		2		5
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		0		0		0		327
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	330		2		330		2		332
Available-for-Sale Securities, Portfolio Concentration Ratings, Amortized Cost [Abstract]
Available-for-Sale Securities Portfolio Concentration Rated US Government GSE Amortized Cost	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost	0				0
Available-for-Sale Securities, Portfolio Concentration Not Rated Amortized Cost	21,285				21,285
Available-for-Sale Securities, Portfolio Concentration Ratings, Fair Value [Abstract]
Available-for-Sale Securities, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Available-for-Sale Securities, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Available-for-Sale Securities, Portfolio Concentration Rated Not Rated Fair Value	24,944				24,944
Available-for-sale Securities [Member] | Equity Securities Mutual Funds And Other Stock [Member]
Available-for-Sale Securities, Amortized cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	43,456				43,456
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	48,375				48,375
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	48,375				48,375
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					1.20
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Available-for-Sale Securities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,221,293				10,221,293
Available-for-Sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-Sale Securities, Fair Value	10,221,293				10,221,293
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Available-for-Sale Securities, Debt Maturities, Nominal Yield (in hundredths)					2.72	[11]
Held-to-maturity Securities [Member]
Held-to-maturity, Temporarily Impaired Securities [Abstract]
Held-to-maturity, Temporarily impaired Securities, Number of Securities	6		2		6		2		6
Held-to-maturity, Temporarily impaired Securities, Fair Value [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Fair Value	9,321		619		9,321		619		93,050
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Fair Value	0		0		0		0		0
Held-to-maturity, Temporarily impaired Securities, Total, Fair Value	9,321		619		9,321		619		93,050
Held-to-maturity, Temporarily impaired Securities, Unrealized Loss [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Unrealized Loss	25		4		25		4		1,772
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Unrealized Loss	0		0		0		0		0
Held-to-maturity, Temporarily impaired Securities, Total, Unrealized Loss	25		4		25		4		1,772
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government GSE, Carrying Value	102,347	[6]			102,347	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Carrying Value	217,494				217,494
Held-to-maturity, Portfolio Concentration Rated A to BBB, Carrying Value	30,100				30,100
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Carrying Value	62,538				62,538
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government or GSE, Fair Value	105,535	[6]			105,535	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Fair Value	239,615				239,615
Held-to-maturity, Portfolio Concentration Rated A to BBB, Fair Value	30,777				30,777
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Fair Value	64,711				64,711
Held-to-maturity Securities [Member] | Municipal and Other Tax Exempt Securities [Member]
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Effective tax rate for nominal yield calculation					39.00%
Held-to-maturity, Temporarily Impaired Securities [Abstract]
Held-to-maturity, Temporarily impaired Securities, Number of Securities	6		2		6		2		1
Held-to-maturity, Temporarily impaired Securities, Fair Value [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Fair Value	9,321		619		9,321		619		479
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Fair Value	0		0		0		0		0
Held-to-maturity, Temporarily impaired Securities, Total, Fair Value	9,321		619		9,321		619		479
Held-to-maturity, Temporarily impaired Securities, Unrealized Loss [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Unrealized Loss	25		4		25		4		2
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Unrealized Loss	0		0		0		0		0
Held-to-maturity, Temporarily impaired Securities, Total, Unrealized Loss	25		4		25		4		2
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government GSE, Carrying Value	0	[6]			0	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Carrying Value	42,921				42,921
Held-to-maturity, Portfolio Concentration Rated A to BBB, Carrying Value	29,500				29,500
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Carrying Value	53,747				53,747
Held-to-maturity, Carrying Value	126,168				126,168
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Fair Value	44,351				44,351
Held-to-maturity, Portfolio Concentration Rated A to BBB, Fair Value	30,177				30,177
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Fair Value	55,780				55,780
Held-to-maturity, Portfolio Concentration, Fair Value	130,308				130,308
Held-to-maturity Securities [Member] | Other Debt Obligations [Member]
Held-to-maturity, Temporarily Impaired Securities [Abstract]
Held-to-maturity, Temporarily impaired Securities, Number of Securities			0				0
Held-to-maturity, Temporarily impaired Securities, Fair Value [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Fair Value			0				0
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Fair Value			0				0
Held-to-maturity, Temporarily impaired Securities, Total, Fair Value			0				0
Held-to-maturity, Temporarily impaired Securities, Unrealized Loss [Abstract]
Held-to-maturity, Temporarily impaired Securities, Less Than 12, Unrealized Loss			0				0
Held-to-maturity, Temporarily impaired Securities, 12 Months or longer, Unrealized Loss			0				0
Held-to-maturity, Temporarily impaired Securities, Total, Unrealized Loss			0				0
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government GSE, Carrying Value	0	[6]			0	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Carrying Value	174,573				174,573
Held-to-maturity, Portfolio Concentration Rated A to BBB, Carrying Value	600				600
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Carrying Value	8,791				8,791
Held-to-maturity, Carrying Value	183,964				183,964
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government or GSE, Fair Value	0	[6]			0	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Fair Value	195,264				195,264
Held-to-maturity, Portfolio Concentration Rated A to BBB, Fair Value	600				600
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Fair Value	8,931				8,931
Held-to-maturity, Portfolio Concentration, Fair Value	204,795				204,795
Held-to-maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Available-for-Sale Securities, Debt Maturities, Nominal Yield[Abstract]
Average Expected Life of Mortgage Backed Security	3.8				3.8
Held-to-maturity, Portfolio Concentration Ratings, Carrying Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government GSE, Carrying Value	102,347	[6]			102,347	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated A to BBB, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Carrying Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Carrying Value	0				0
Held-to-maturity, Carrying Value	102,347				102,347
Held-to-maturity, Portfolio Concentration Ratings, Fair Value [Abstract]
Held-to-maturity, Portfolio Concentration Rated US Government or GSE, Fair Value	105,535	[6]			105,535	[6]
Held-to-maturity, Portfolio Concentration Rated AAA to AA, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated A to BBB, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated Below Investment Grade, Fair Value	0				0
Held-to-maturity, Portfolio Concentration Rated Not Rated Fair Value	0				0
Held-to-maturity, Portfolio Concentration, Fair Value	105,535				105,535
Unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income [Member] | Alt A [Member]
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	16		19		16		19		19
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0		0		0		0		0
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	118,414		153,632		118,414		153,632		132,242
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	118,414		153,632		118,414		153,632		132,242
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0		0		0		0		0
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	15,852		29,117		15,852		29,117		36,219
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	15,852		29,117		15,852		29,117		36,219
Unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income [Member] | Jumbo A Loans [Member]
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	27		21		27		21		36
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	0		0		0		0		3,809
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	162,754		138,205		162,754		138,205		202,874
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	162,754		138,205		162,754		138,205		206,683
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	0		0		0		0		256
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	20,245		27,470		20,245		27,470		36,331
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	20,245		27,470		20,245		27,470		36,587
Unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income [Member] | Municipal and Other Tax Exempt Securities [Member]
Available-for-Sale Securities, Temporarily Impaired Securities [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Number of Securities	21		21		21		21
Available-for-Sale Securities, Temporarily impaired Securities, Fair Value[Abstract]
Available-for-sale Securities, Temporarily impaired Securities, Less than Twelve Months, Fair Value	12,804		6,948		12,804		6,948
Available-for-Sale Securities, Temporarily impaired Securities, 12 Months or longer, Fair Value	0		7,115		0		7,115
Available-for-sale Securities, Temporarily impaired Securities, Total, Fair Value	12,804		14,063		12,804		14,063
Available-for-Sale Securities, Temporarily impaired Securities, Unrealized Loss [Abstract]
Available-for-Sale Securities, Temporarily impaired Securities, Less Than 12,Unrealized Loss	593		244		593		244
Available-for-sale Securities, Temporarily Impaired Securities, 12 Months or Longer, Unrealized Loss	0		277		0		277
Available-for-Sale Securities, Temporarily impaired Securities, Total, Unrealized Loss	$ 593		$ 521		$ 593		$ 521

[1] Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.

[2] Nominal yield on municipal and other tax-exempt securities and other debt securities with contractual maturity dates over ten years are based on variable rates which generally are reset within 35 days.

[3] Gross unrealized gain/ loss recognized in AOCI in the consolidated balance sheet.

[4] Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet

[5] Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.

[6] U.S. government and government sponsored enterprises are not rated by the nationally-recognized rating agencies as these securities are guaranteed by agencies of the U.S. government or government-sponsored enterprises.

[7] Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

[8] Calculated on a taxable equivalent basis using a 39% effective tax rate.

[9] Includes the following securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income:

[10] Includes the following securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income:Municipal and other tax-exempt 21 6,948 244 7,115 277 14,063 521Alt-A loans 19 — — 153,632 29,117 153,632 29,117Jumbo-A loans 21 — — 138,205 27,470 138,205 27,470

[11] The nominal yield on mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments.