Securities (Tables)

3 Months Ended

Mar. 31, 2016

Marketable Securities [Abstract]

Trading Securities [Table Text Block]

The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands):

	March 31, 2016				December 31, 2015					March 31, 2015
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)			Fair Value		Net Unrealized Gain (Loss)
U.S. Government agency debentures	$	59,733	$	71	$	61,295	$	(71	)	$	26,283	$	40
U.S. agency residential mortgage-backed securities	146,896		821		10,989		17			17,179		5
Municipal and other tax-exempt securities	58,797		546		31,901		210			54,164		(4		)
Other trading securities	14,113		107		18,219		(16		)	20,418		53
Total trading securities	$	279,539	$	1,545	$	122,404	$	140		$	118,044	$	94

Investment Securities (Held-to-Maturity) [Table Text Block]

The amortized cost and fair values of investment securities are as follows (in thousands):

	March 31, 2016
	Amortized		Carrying		Fair		Gross Unrealized2
	Cost		Value1		Value		Gain		Loss
Municipal and other tax-exempt	$	347,684	$	347,684	$	352,542	$	4,952	$	(94	)
U.S. agency residential mortgage-backed securities – Other	25,323		25,366		26,794		1,428		—
Other debt securities	202,997		202,997		230,407		27,448		(38		)
Total investment securities	$	576,004	$	576,047	$	609,743	$	33,828	$	(132	)

¹  Carrying value includes $43 thousand of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio in 2011.

²  Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.

	December 31, 2015
	Amortized		Carrying		Fair		Gross Unrealized2
	Cost		Value1		Value		Gain		Loss
Municipal and other tax-exempt	$	365,258	$	365,258	$	368,910	$	3,935	$	(283	)
U.S. agency residential mortgage-backed securities – Other	26,721		26,833		27,874		1,063		(22		)
Other debt securities	205,745		205,745		232,375		26,689		(59		)
Total investment securities	$	597,724	$	597,836	$	629,159	$	31,687	$	(364	)

¹  Carrying value includes $112 thousand of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio in 2011.

²  Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.

	March 31, 2015
	Amortized		Carrying		Fair		Gross Unrealized2
	Cost		Value1		Value		Gain		Loss
Municipal and other tax-exempt	$	396,063	$	396,063	$	400,112	$	4,443	$	(394	)
U.S. agency residential mortgage-backed securities – Other	33,109		33,545		35,253		1,708		—
Other debt securities	204,979		204,979		222,606		18,500		(873		)
Total investment securities	$	634,151	$	634,587	$	657,971	$	24,651	$	(1,267	)

¹  Carrying value includes $436 thousand of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio in 2011.

²  Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.

The amortized cost and fair values of investment securities at March 31, 2016, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year			One to Five Years			Six to Ten Years			Over Ten Years			Total			Weighted Average Maturity²
Municipal and other tax-exempt:
Carrying value	$	66,228		$	234,480		$	13,406		$	33,570		$	347,684		3.14
Fair value	66,280			236,135			13,692			36,435			352,542
Nominal yield¹	1.39		%	1.92		%	2.89		%	5.77		%	2.23		%
Other debt securities:
Carrying value	14,387			42,985			95,825			49,800			202,997			7.31
Fair value	14,679			46,855			109,580			59,293			230,407
Nominal yield	3.65		%	4.89		%	5.57		%	6.05		%	5.41		%
Total fixed maturity securities:
Carrying value	$	80,615		$	277,465		$	109,231		$	83,370		$	550,681		4.67
Fair value	80,959			282,990			123,272			95,728			582,949
Nominal yield	1.79		%	2.38		%	5.24		%	5.94		%	3.40		%
Residential mortgage-backed securities:
Carrying value													$	25,366		³
Fair value													26,794
Nominal yield4													2.75		%
Total investment securities:
Carrying value													$	576,047
Fair value													609,743
Nominal yield													3.37		%

¹  Calculated on a taxable equivalent basis using a 39% effective tax rate.

²  Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

³  The average expected lives of residential mortgage-backed securities were 3.9 years based upon current prepayment assumptions.

⁴  The nominal yield on residential mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary - Unaudited for current yields on the investment securities portfolio.

Available For Sale Securities [Table Text Block]

The amortized cost and fair value of available for sale securities are as follows (in thousands):

	March 31, 2016
	Amortized		Fair		Gross Unrealized1
	Cost		Value		Gain		Loss			OTTI²
U.S. Treasury	$	1,000	$	1,003	$	3	$	—		$	—
Municipal and other tax-exempt	51,197		51,308		814		(703		)	—
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	2,983,694		3,051,280		68,479		(893		)	—
FHLMC	1,870,002		1,903,789		34,098		(311		)	—
GNMA	758,979		761,456		3,558		(1,081		)	—
Other	—		—		—		—			—
Total U.S. government agencies	5,612,675		5,716,525		106,135		(2,285		)	—
Private issue:
Alt-A loans	54,288		59,049		5,434		—			(673		)
Jumbo-A loans	68,725		73,981		5,919		(59		)	(604		)
Total private issue	123,013		133,030		11,353		(59		)	(1,277		)
Total residential mortgage-backed securities	5,735,688		5,849,555		117,488		(2,344		)	(1,277		)
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,904,149		2,942,404		39,518		(1,263		)	—
Other debt securities	4,400		4,151		—		(249		)	—
Perpetual preferred stock	17,171		19,575		2,404		—			—
Equity securities and mutual funds	17,195		18,040		915		(70		)	—
Total available for sale securities	$	8,730,800	$	8,886,036	$	161,142	$	(4,629	)	$	(1,277	)

¹ Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet.

² Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.

	December 31, 2015
	Amortized		Fair		Gross Unrealized¹
	Cost		Value		Gain		Loss			OTTI²
U.S. Treasury	$	1,000	$	995	$	—	$	(5	)	$	—
Municipal and other tax-exempt	56,681		56,817		873		(737		)	—
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	3,156,214		3,187,215		41,502		(10,501		)	—
FHLMC	1,940,915		1,949,335		14,727		(6,307		)	—
GNMA	763,967		761,801		2,385		(4,551		)	—
Other	—		—		—		—			—
Total U.S. government agencies	5,861,096		5,898,351		58,614		(21,359		)	—
Private issue:
Alt-A loans	56,387		62,574		6,574		—			(387		)
Jumbo-A loans	71,724		76,544		5,260		—			(440		)
Total private issue	128,111		139,118		11,834		—			(827		)
Total residential mortgage-backed securities	5,989,207		6,037,469		70,448		(21,359		)	(827		)
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,919,044		2,905,796		5,396		(18,644		)	—
Other debt securities	4,400		4,151		—		(249		)	—
Perpetual preferred stock	17,171		19,672		2,501		—			—
Equity securities and mutual funds	17,121		17,833		752		(40		)	—
Total available for sale securities	$	9,004,624	$	9,042,733	$	79,970	$	(41,034	)	$	(827	)

¹ Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet.

² Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.

	March 31, 2015
	Amortized		Fair		Gross Unrealized1
	Cost		Value		Gain		Loss			OTTI²
U.S. Treasury	$	1,000	$	1,001	$	1	$	—		$	—
Municipal and other tax-exempt	60,298		60,818		1,242		(722		)	—
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	3,844,253		3,930,186		87,993		(2,060		)	—
FHLMC	2,040,364		2,079,310		39,989		(1,043		)	—
GNMA	698,346		703,206		6,031		(1,171		)	—
Other	4,533		4,867		334		—			—
Total U.S. government agencies	6,587,496		6,717,569		134,347		(4,274		)	—
Private issue:
Alt-A loans	63,765		69,369		6,601		—			(997		)
Jumbo-A loans	85,269		90,662		5,769		—			(376		)
Total private issue	149,034		160,031		12,370		—			(1,373		)
Total residential mortgage-backed securities	6,736,530		6,877,600		146,717		(4,274		)	(1,373		)
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,157,985		2,164,842		13,849		(6,992		)	—
Other debt securities	9,405		9,155		—		(250		)	—
Perpetual preferred stock	22,171		24,983		2,812		—			—
Equity securities and mutual funds	18,679		19,776		1,117		(20		)	—
Total available for sale securities	$	9,006,068	$	9,158,175	$	165,738	$	(12,258	)	$	(1,373	)

¹  Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet.

²  Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.

The amortized cost and fair values of available for sale securities at March 31, 2016, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year			One to Five Years			Six to Ten Years			Over Ten Years				Total			Weighted Average Maturity5
U.S. Treasuries:
Amortized cost	$	—		$	1,000		$	—		$	—			$	1,000		1.79
Fair value	—			1,003			—			—				1,003
Nominal yield	—		%	0.87		%	—		%	—		%		0.87		%
Municipal and other tax-exempt:
Amortized cost	$	9,829		$	16,841		$	2,791		$	21,736			$	51,197		8.62
Fair value	9,958			17,235			2,859			21,256				51,308
Nominal yield¹	4.43		%	4.01		%	3.69		%	2.01		%	6	3.22		%
Commercial mortgage-backed securities:
Amortized cost	$	—		$	903,717		$	1,797,361		$	203,071			$	2,904,149		7.18
Fair value	—			911,758			1,826,793			203,853				2,942,404
Nominal yield	—		%	1.63		%	1.89		%	1.48		%		1.78		%
Other debt securities:
Amortized cost	$	—		$	—		$	—		$	4,400			$	4,400		31.41
Fair value	—			—			—			4,151				4,151
Nominal yield	—		%	—		%	—		%	1.71		%	6	1.71		%
Total fixed maturity securities:
Amortized cost	$	9,829		$	921,558		$	1,800,152		$	229,207			$	2,960,746		7.24
Fair value	9,958			929,996			1,829,652			229,260				2,998,866
Nominal yield	4.43		%	1.67		%	1.89		%	1.53		%		1.80		%
Residential mortgage-backed securities:
Amortized cost														$	5,735,688		2
Fair value														5,849,555
Nominal yield4														1.94		%
Equity securities and mutual funds:
Amortized cost														$	34,366		³
Fair value														37,615
Nominal yield														—		%
Total available-for-sale securities:
Amortized cost														$	8,730,800
Fair value														8,886,036
Nominal yield														1.88		%

¹  Calculated on a taxable equivalent basis using a 39 percent effective tax rate.

²  The average expected lives of mortgage-backed securities were 3.4 years years based upon current prepayment assumptions.

³  Primarily common stock and preferred stock of corporate issuers with no stated maturity.

⁴  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. See Quarterly Financial Summary –– Unaudited following for current yields on available for sale securities portfolio.

⁵  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.

⁶  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.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):

	Three Months Ended March 31,
	2016		2015
Proceeds	$	469,382	$	334,825
Gross realized gains	3,964		4,900
Gross realized losses	—		(573		)
Related federal and state income tax expense	1,542		1,683

Securities Pledged As Collateral [Table Text Block]

	March 31, 2016		Dec. 31, 2015		March 31, 2015
Investment:
Carrying value	$	263,720	$	231,033	$	63,425
Fair value	268,422		234,382		65,723
Available for sale:
Amortized cost	7,307,788		6,831,743		6,065,705
Fair value	7,424,702		6,849,524		6,155,570

Schedule of Unrealized Loss on Investments [Table Text Block]

Temporarily Impaired Securities as of March 31, 2016

(in thousands):

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal and other tax-exempt	19	$	14,175	$	8	$	4,364	$	86	$	18,539	$	94
U.S. Agency residential mortgage-backed securities – Other	—	—		—		—		—		—		—
Other debt securities	7	—		—		1,876		38		1,876		38
Total investment securities	26	$	14,175	$	8	$	6,240	$	124	$	20,415	$	132

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
Municipal and other tax-exempt	17	$	1,010	$	3	$	10,307	$	700	$	11,317	$	703
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	4	70,069		794		51,457		99		121,526		893
FHLMC	1	—		—		23,914		311		23,914		311
GNMA	12	265,293		585		99,088		496		364,381		1,081
Total U.S. government agencies	17	335,362		1,379		174,459		906		509,821		2,285
Private issue1:
Alt-A loans	5	8,870		137		8,625		536		17,495		673
Jumbo-A loans	9	7,169		59		7,959		604		15,128		663
Total private issue	14	16,039		196		16,584		1,140		32,623		1,336
Total residential mortgage-backed securities	31	351,401		1,575		191,043		2,046		542,444		3,621
Commercial mortgage-backed securities guaranteed by U.S. government agencies	31	157,662		197		260,945		1,066		418,607		1,263
Other debt securities	2	—		—		4,151		249		4,151		249
Perpetual preferred stocks	—	—		—		—		—		—		—
Equity securities and mutual funds	37	3,241		49		1,029		21		4,270		70
Total available for sale securities	118	$	513,314	$	1,824	$	467,475	$	4,082	$	980,789	$	5,906

¹  Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.

Temporarily Impaired Securities as of December 31, 2015

(In thousands)

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal and other tax-exempt	73	$	127,319	$	207	$	13,380	$	77	$	140,699	$	284
U.S. Agency residential mortgage-backed securities – Other	1	5,533		22		—		—		5,533		22
Other debt securities	11	1,082		41		1,715		18		2,797		59
Total investment securities	85	$	133,934	$	270	$	15,095	$	95	$	149,029	$	365

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
Treasury	1	$	995	$	5	$	—	$	—	$	995	$	5
Municipal and other tax-exempt	20	$	9,909	$	27	$	11,664	$	710	$	21,573	$	737
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	55	1,188,022		10,262		18,236		239		1,206,258		10,501
FHLMC	40	726,713		4,827		77,545		1,480		804,258		6,307
GNMA	15	364,919		1,951		102,109		2,600		467,028		4,551
Total U.S. government agencies	110	2,279,654		17,040		197,890		4,319		2,477,544		21,359
Private issue1:
Alt-A loans	4	—		—		9,264		387		9,264		387
Jumbo-A loans	8	—		—		8,482		440		8,482		440
Total private issue	12	—		—		17,746		827		17,746		827
Total residential mortgage-backed securities	122	2,279,654		17,040		215,636		5,146		2,495,290		22,186
Commercial mortgage-backed securities guaranteed by U.S. government agencies	213	1,582,469		11,419		484,258		7,225		2,066,727		18,644
Other debt securities	2	—		—		4,151		249		4,151		249
Perpetual preferred stocks	—	—		—		—		—		—		—
Equity securities and mutual funds	61	782		5		991		35		1,773		40
Total available for sale securities	419	$	3,873,809	$	28,496	$	716,700	$	13,365	$	4,590,509	$	41,861

¹  Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.

Temporarily Impaired Securities as of March 31, 2015

(In thousands)

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal and other tax-exempt	37	$	41,048	$	173	$	53,662	$	221	$	94,710	$	394
U.S. Agency residential mortgage-backed securities – Other	—	—		—		—		—		—		—
Other debt securities	97	31,451		846		2,478		27		33,929		873
Total investment securities	134	$	72,499	$	1,019	$	56,140	$	248	$	128,639	$	1,267

	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
Municipal and other tax-exempt1	20	$	10,217	$	27	$	11,705	$	695	$	21,922	$	722
Residential mortgage-backed securities:
U. S. government agencies:
FNMA	8	90,133		464		125,166		1,596		215,299		2,060
FHLMC	6	17,511		34		124,912		1,009		142,423		1,043
GNMA	4	—		—		123,884		1,171		123,884		1,171
Total U.S. government agencies	18	107,644		498		373,962		3,776		481,606		4,274
Private issue1:
Alt-A loans	4	10,154		997		—		—		10,154		997
Jumbo-A loans	8	—		—		9,570		376		9,570		376
Total private issue	12	10,154		997		9,570		376		19,724		1,373
Total residential mortgage-backed securities	30	117,798		1,495		383,532		4,152		501,330		5,647
Commercial mortgage-backed securities guaranteed by U.S. government agencies	68	97,374		151		894,815		6,841		992,189		6,992
Other debt securities	2	—		—		4,150		250		4,150		250
Perpetual preferred stocks	—	—		—		—		—		—		—
Equity securities and mutual funds	66	24		—		1,007		20		1,031		20
Total available for sale securities	186	$	225,413	$	1,673	$	1,295,209	$	11,958	$	1,520,622	$	13,631

¹  Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.

Investments by Lowest Credit Rating [Table Text Block]

At March 31, 2016, the composition of the Company’s investment and available for sale securities portfolios by the lowest current credit rating assigned by any of the three nationally-recognized rating agencies is as follows (in thousands):

	AAA - AA				A - BBB				Below Investment Grade				Not Rated				Total
	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Investment:
Municipal and other tax-exempt	$	225,162	$	226,757	$	5,273	$	5,294	$	—	$	—	$	117,249	$	120,491	$	347,684	$	352,542
U.S. agency residential mortgage-backed securities 1	—		—		—		—		—		—		25,366		26,794		25,366		26,794
Other debt securities	140,184		164,008		—		—		—		—		62,813		66,399		202,997		230,407
Total investment securities	$	365,346	$	390,765	$	5,273	$	5,294	$	—	$	—	$	205,428	$	213,684	$	576,047	$	609,743

	AAA - AA				A - BBB				Below Investment Grade				Not Rated				Total
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available for Sale:
U.S. Treasury	$	—	$	—	$	—	$	—	$	—	$	—	$	1,000	$	1,003	$	1,000	$	1,003
Municipal and other tax-exempt	28,543		29,187		9,917		9,350		—		—		12,737		12,771		51,197		51,308
U.S. agency residential mortgage-backed securities 1	—		—		—		—		—		—		5,612,675		5,716,525		5,612,675		5,716,525
Privately issued residential mortgage-backed securities	—		—		—		—		123,013		133,030		—		—		123,013		133,030
Commercial mortgage-backed securities guaranteed by U.S. government agencies	—		—		—		—		—		—		2,904,149		2,942,404		2,904,149		2,942,404
Other debt securities	4,400		4,151		—		—		—		—		—		—		4,400		4,151
Perpetual preferred stock	—		—		6,406		7,455		10,765		12,120		—		—		17,171		19,575
Equity securities and mutual funds	4		465		—		—		—		—		17,191		17,575		17,195		18,040
Total available for sale securities	$	32,947	$	33,803	$	16,323	$	16,805	$	133,778	$	145,150	$	8,547,752	$	8,690,278	$	8,730,800	$	8,886,036

¹  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.

Other-than-temporary impairement, Private Lable Mortgage-Backed Securities, Assumptions Used to Develop Projected Cash Flows [Table Text Block]

The primary assumptions used in this evaluation were:

	March 31, 2016	Dec. 31, 2015	March 31, 2015
Unemployment rate	Moving down to 4.8 percent over the next 12 months and remain at 4.8 percent thereafter.	Decreasing to 4.8 percent over the next 12 months and remain at 4.8 percent thereafter.	Held constant at 5.6 percent over the next 12 months and remain at 5.6 percent thereafter.
Housing price appreciation/depreciation	Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.5 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter.	Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.5 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter.	Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.2 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter.
Estimated liquidation costs	Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company.	Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company.	Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company.
Discount rates	Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields.	Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields.	Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields.

¹  Federal Housing Finance Agency

Schedule of Privately Issued Residential Mortgage-backed Securities [Table Text Block]

						Credit Losses Recognized
						Three months ended
						March 31, 2016			Life-to-date
	Number of Securities	Amortized Cost		Fair Value		Number of Securities	Amount		Number of Securities	Amount
Alt-A	14	$	54,288	$	59,049	—	$	—	14	$	36,284
Jumbo-A	30	68,725		73,981		—	—		29	18,220
Total	44	$	123,013	$	133,030	—	$	—	43	$	54,504

Rollforward Other-than-temporary Impairment Credit Losses Recognized in Earnings [Table Text Block]

The following is a tabular roll forward of the amount of credit-related OTTI recognized on available for sale debt securities in earnings (in thousands):

	Three Months Ended
	March 31,
	2016		2015
Balance of credit-related OTTI recognized on available for sale debt securities, beginning of period	$	54,504	$	54,347
Additions for credit-related OTTI not previously recognized	—		—
Additions for increases in credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost	—		92
Reductions for change in intent to hold before recovery	—		—
Sales	—		—
Balance of credit-related OTTI recognized on available for sale debt securities, end of period	$	54,504	$	54,439

Fair Value Option Securities [Table Text Block]

The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):

	March 31, 2016				Dec. 31, 2015					March 31, 2015
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)			Fair Value		Net Unrealized Gain (Loss)
U.S. agency residential mortgage-backed securities	$	418,887	$	4,136	$	444,217	$	(2,060	)	$	434,077	$	4,271

Schedule of Restricted Equity Securities [Table Text Block]

	March 31, 2016		Dec. 31, 2015		March 31, 2015
Federal Reserve stock	$	36,148	$	36,148	$	35,018
Federal Home Loan Bank stock	278,271		237,365		177,667
Other	171		171		—
Total	$	314,590	$	273,684	$	212,685