CONDENSED HOLDING COMPANY ONLY FINANCIAL STATEMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
ASSETS:
Cash and due from banks	$ 45,777				$ 79,076					$ 45,777		$ 79,076
Investment securities available-for-sale	18,649				32,950					18,649		32,950
Trading securities	6,822				4,874					6,822		4,874
MBS available-for-sale	31,543				49,021					31,543		49,021
Other assets	107,284				116,566					107,284		116,566
Total assets	4,028,190				3,905,399					4,028,190		3,905,399
LIABILITIES AND STOCKHOLDERS' EQUITY:
Trust Preferred securities payable	70,680				70,680					70,680		70,680
Other liabilities	35,454				38,463					35,454		38,463
Stockholders' equity	435,506				391,574					435,506		391,574		361,034
Total liabilities and stockholders' equity	4,028,190				3,905,399					4,028,190		3,905,399
CONDENSED STATEMENTS OF OPERATIONS [Abstract]
Net interest loss	30,767	31,653	33,752	32,314	8,551	[1]	33,398	34,498	33,394	128,487		109,842		139,502
Non-interest income	1,837	2,008	1,721	1,898	16,498	[1]	2,574	2,988	1,790	7,463		23,849		7,929
Non-interest expense	15,461	15,575	15,347	16,309	14,717		15,771	15,676	16,408	62,692		62,572		61,688
Income tax credit	6,891	7,215	8,059	7,176	3,534		8,280	8,004	7,072	29,341		26,890		31,588
Net income	10,308	10,631	12,039	10,570	6,735		11,795	11,531	10,247	43,548		40,308		47,309
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]
Net income	10,308	10,631	12,039	10,570	6,735		11,795	11,531	10,247	43,548		40,308		47,309
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization										2,834		2,880		2,935
Decrease (Increase) in other assets										(8,168)		(6,009)		(5,671)
(Decrease) Increase in other liabilities										5,637		3,663		(3,552)
Net cash provided by operating activities										61,151		72,705		62,587
Cash flows from Investing Activities:
Proceeds from sale of investment securities available-for-sale										366		22,415		236
Proceeds from the sales of trading securities										131		171		136
Purchases of investment securities available-for-sale										458		80,153		293,157
Net purchases of trading securities										1,814		3,158		454
Principal collected on MBS available-for-sale										17,372		42,822		48,911
Net cash provided by investing activities										(168,403)		149,568		(39,898)
Cash flows from Financing Activities:
Equity award distribution										293		145		0
Net cash used in financing activities										73,953		(187,457)		(69,158)
Net increase (decrease) in cash and due from banks										(33,299)		34,816		(46,469)
Cash and due from banks, beginning of period				79,076					44,260	79,076		44,260		90,729
Cash and due from banks, end of period	45,777				79,076					45,777		79,076		44,260
Holding Company [Member]
ASSETS:
Cash and due from banks	61,665				17,684					61,665		17,684
Investment securities available-for-sale	3,558				3,006					3,558		3,006
Trading securities	6,822				4,874					6,822		4,874
MBS available-for-sale	573				716					573		716
ESOP loan to subsidiary	3,401				3,567					3,401		3,567
Investment in subsidiaries	427,083				429,533					427,083		429,533
Other assets	3,435				3,664					3,435		3,664
Total assets	506,537				463,044					506,537		463,044
LIABILITIES AND STOCKHOLDERS' EQUITY:
Trust Preferred securities payable	70,680				70,680					70,680		70,680
Other liabilities	351				790					351		790
Stockholders' equity	435,506				391,574					435,506		391,574
Total liabilities and stockholders' equity	506,537				463,044					506,537		463,044
CONDENSED STATEMENTS OF OPERATIONS [Abstract]
Net interest loss										(4,851)	[2]	(4,830)	[2]	(4,831)	[2]
Dividends received from Bank										54,500	[2]	20,000	[2]	20,000	[2]
Non-interest income										812	[2]	1,493	[2]	453	[2]
Non-interest expense										(636)	[2]	(635)	[2]	(516)	[2]
Income before income taxes and equity in undistributed earnings of direct subsidiaries										49,825	[2]	16,028	[2]	15,106	[2]
Income tax credit										2,183	[2]	1,823	[2]	2,277	[2]
Income before equity in undistributed earnings of direct subsidiaries										52,008	[2]	17,851	[2]	17,383	[2]
Equity in (overdistributed) undistributed earnings of subsidiaries										(8,460)	[2]	22,457	[2]	29,926	[2]
Net income										43,548	[2]	40,308	[2]	47,309	[2]
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]
Net income										43,548	[2]	40,308	[2]	47,309	[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in (undistributed) overdistributed earnings of direct subsidiaries										8,460		(22,457)		(29,926)
Net gain on the sale of investment securities available for sale										(110)		(941)		(22)
Net (gain) loss on trading securities										(265)		(103)		34
Net amortization										0		0		0
Decrease (Increase) in other assets										355		1,866		(296)
(Decrease) Increase in other liabilities										(595)		(149)		71
Net cash provided by operating activities										51,393		18,524		17,170
Cash flows from Investing Activities:
Proceeds from sale of investment securities available-for-sale										366		2,418		226
Proceeds from the sales of trading securities										131		0		0
Purchases of investment securities available-for-sale										(458)		(403)		(291)
Reimbursement from subsidiary for purchases of investment securities available-for-sale										642		2,917		275
Net purchases of trading securities										(202)		(2,997)		(318)
Principal collected on MBS available-for-sale										138		72		70
Principal repayments on ESOP loan										166		154		142
Net cash provided by investing activities										783		2,161		104
Cash flows from Financing Activities:
Common stock issued for exercise of stock options										11,228		5,608		3,669
Equity award distribution										293		145		0
Cash dividends paid to stockholders										(19,716)		(19,208)		(18,887)
Net cash used in financing activities										(8,195)		(13,455)		(15,218)
Net increase (decrease) in cash and due from banks										43,981		7,230		2,056
Cash and due from banks, beginning of period				17,684					10,454	17,684		10,454		8,398
Cash and due from banks, end of period	$ 61,665				$ 17,684					$ 61,665		$ 17,684		$ 10,454

[1] During the three months ended December 31, 2012, a charge of $25,582 on the prepayment of REPOS was recognized as a reduction to net interest income, and a gain on the sale of premises and fixed assets of $13,726 was recognized as a component of non-interest income.

[2] Other comprehensive income for the Holding Company approximated other comprehensive income for the consolidated Company during the years ended December 31, 2013, 2012 and 2011.