Allowance for Losses on Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	$ 116,741	$ 133,147	$ 133,147
Charge-offs	(4,812)		(34,101)
Recoveries	10,829		16,345
Provisions & Transfers	(4,600)		1,350
Ending Allowance	118,158		116,741
Provision (recovery) for loan losses	(4,600)	3,600
Loans receivable, gross	8,110,309		7,990,545
Nonaccrual loans by portfolio segment	114,717	163,116	131,299
Percentage increase (decrease) in nonperforming assets	(29.70%)
Allowance for credit losses, charge-offs, net of recoveries	(6,017)	9,920
Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	64,184	81,815	81,815
Charge-offs	(2,334)		(20,947)
Recoveries	8,827		9,416
Provisions & Transfers	(2,985)		(6,100)
Ending Allowance	67,692		64,184
Loans receivable, gross	5,436,083		5,373,950
Nonaccrual loans by portfolio segment	89,075		100,460
Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	8,407	12,060	12,060
Charge-offs	(450)		(1,446)
Recoveries	95		501
Provisions & Transfers	90		(2,708)
Ending Allowance	8,142		8,407
Loans receivable, gross	135,868		130,778
Nonaccrual loans by portfolio segment	3,053		4,560
Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	882	347	347
Charge-offs	0		(481)
Recoveries	0		0
Provisions & Transfers	592		1,016
Ending Allowance	1,474		882
Loans receivable, gross	333,954		302,722
Nonaccrual loans by portfolio segment	0		0
Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	9,165	15,598	15,598
Charge-offs	(456)		(3,983)
Recoveries	439		4,105
Provisions & Transfers	(2,064)		(6,555)
Ending Allowance	7,084		9,165
Loans receivable, gross	75,506		81,660
Nonaccrual loans by portfolio segment	2,813		2,903
Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,552	4,937	4,937
Charge-offs	(242)		(1,363)
Recoveries	22		40
Provisions & Transfers	(58)		(62)
Ending Allowance	3,274		3,552
Loans receivable, gross	122,467		124,984
Nonaccrual loans by portfolio segment	3,548		3,337
Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,816	5,280	5,280
Charge-offs	0		(1,043)
Recoveries	0		171
Provisions & Transfers	293		(592)
Ending Allowance	4,109		3,816
Loans receivable, gross	846,116		835,598
Nonaccrual loans by portfolio segment	2,494		6,573
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	5,595	1,956	1,956
Charge-offs	0		(747)
Recoveries	0		17
Provisions & Transfers	273		4,369
Ending Allowance	5,868		5,595
Loans receivable, gross	622,240		625,293
Nonaccrual loans by portfolio segment	11,613		11,736
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	16,614	7,626	7,626
Charge-offs	(248)		(1,145)
Recoveries	421		95
Provisions & Transfers	(282)		10,038
Ending Allowance	16,505		16,614
Loans receivable, gross	354,166		326,450
Nonaccrual loans by portfolio segment	655		477
HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,002	965	965
Charge-offs	0		(163)
Recoveries	0		0
Provisions & Transfers	(59)		200
Ending Allowance	943		1,002
Loans receivable, gross	131,949		133,631
Nonaccrual loans by portfolio segment	471		263
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,524	2,563	2,563
Charge-offs	(1,082)		(2,783)
Recoveries	1,025		2,000
Provisions & Transfers	(400)		1,744
Ending Allowance	3,067		3,524
Loans receivable, gross	51,960		55,479
Nonaccrual loans by portfolio segment	995		990
Loans Collectively Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	116,552		113,268
Loans receivable, gross	7,653,869		7,495,504
Allowance as a percentage of outstanding loans and leases	1.50%		1.50%
Loans Collectively Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	67,692		64,184
Loans receivable, gross	5,336,460		5,262,159
Allowance as a percentage of outstanding loans and leases	1.30%		1.20%
Loans Collectively Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	7,607		7,307
Loans receivable, gross	122,994		115,554
Allowance as a percentage of outstanding loans and leases	6.20%		6.30%
Loans Collectively Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,474		882
Loans receivable, gross	333,954		302,722
Allowance as a percentage of outstanding loans and leases	0.40%		0.30%
Loans Collectively Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	6,013		6,943
Loans receivable, gross	63,875		67,521
Allowance as a percentage of outstanding loans and leases	9.40%		10.30%
Loans Collectively Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	3,274		3,506
Loans receivable, gross	104,675		107,216
Allowance as a percentage of outstanding loans and leases	3.10%		3.30%
Loans Collectively Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	4,109		3,711
Loans receivable, gross	833,508		824,279
Allowance as a percentage of outstanding loans and leases	0.50%		0.50%
Loans Collectively Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	5,868		5,595
Loans receivable, gross	416,440		400,789
Allowance as a percentage of outstanding loans and leases	1.40%		1.40%
Loans Collectively Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	16,505		16,614
Loans receivable, gross	287,251		256,954
Allowance as a percentage of outstanding loans and leases	5.70%		6.50%
Loans Collectively Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	943		1,002
Loans receivable, gross	110,570		111,169
Allowance as a percentage of outstanding loans and leases	0.90%		0.90%
Loans Collectively Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	3,067		3,524
Loans receivable, gross	44,142		47,141
Allowance as a percentage of outstanding loans and leases	6.90%		7.50%
Loans Individually Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,606		3,473
Loans receivable, gross	147,821		159,564
Allowance as a percentage of outstanding loans and leases	1.10%		2.20%
Loans Individually Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	85,436		96,989
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	535		1,100
Loans receivable, gross	12,874		15,224
Allowance as a percentage of outstanding loans and leases	4.20%		7.20%
Loans Individually Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	0		0
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,071		2,222
Loans receivable, gross	8,200		10,254
Allowance as a percentage of outstanding loans and leases	13.10%		21.70%
Loans Individually Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		46
Loans receivable, gross	14,531		14,455
Allowance as a percentage of outstanding loans and leases	0.00%		0.30%
Loans Individually Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		105
Loans receivable, gross	8,835		7,405
Allowance as a percentage of outstanding loans and leases	0.00%		1.40%
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	16,921		14,172
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	17		48
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	1,007		1,017
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0
Loans receivable, gross	0		0
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%
Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans receivable, gross	197,910	264,219
Grade as percentage of total gross loans	1.37%	2.02%
Nonaccrual loans by portfolio segment	114,717		131,299
Nonperforming Financing Receivable [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	89,075		100,460
Nonperforming Financing Receivable [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	3,053		4,560
Nonperforming Financing Receivable [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	0		0
Nonperforming Financing Receivable [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	2,813		2,903
Nonperforming Financing Receivable [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	3,548		3,337
Nonperforming Financing Receivable [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	2,494		6,573
Nonperforming Financing Receivable [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	11,613		11,736
Nonperforming Financing Receivable [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	655		477
Nonperforming Financing Receivable [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	471		263
Nonperforming Financing Receivable [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	$ 995		$ 990