Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Allowance for loan losses:
Individually evaluated for impairment	$ 14,059		$ 14,059		$ 21,451
Collectively evaluated for probable incurred losses	52,126		52,126		65,294
Total allowance for loan losses	66,185		66,185		86,745
Portfolio loans:
Individually evaluated for impairment	205,295		205,295		284,286
Collectively evaluated for probable incurred losses	1,078,894		1,078,894		1,256,827
Total portfolio loans	1,284,189		1,284,189		1,541,113
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	73,438	106,531	86,745	126,305
Acquired loan loss reserve				2,380
Charge-offs	(11,969)	(27,707)	(39,737)	(76,269)
Recoveries	4,254	2,828	17,555	12,020
Net charge-offs	(7,715)	(24,879)	(22,182)	(64,249)
Provision for loan losses	462	15,530	1,622	32,746
Ending balance	66,185	97,182	66,185	97,182
Secured by Real Estate [Member]
Portfolio loans:
Total portfolio loans	1,137,505		1,137,505		1,344,755
Commercial [Member] | Secured by Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	8,468		8,468		10,636
Collectively evaluated for probable incurred losses	16,195		16,195		26,685
Total allowance for loan losses	24,663		24,663		37,321
Portfolio loans:
Individually evaluated for impairment	123,598		123,598		167,792
Collectively evaluated for probable incurred losses	673,747		673,747		739,585
Total portfolio loans	797,345		797,345		907,377
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	29,730	48,880	37,321	47,823
Acquired loan loss reserve				1,043
Charge-offs	(6,577)	(11,259)	(16,143)	(26,133)
Recoveries	1,819	906	5,784	2,950
Net charge-offs	(4,758)	(10,353)	(10,359)	(23,183)
Provision for loan losses	3,029	7,376	6,470	20,220
Additional unallocated allowance	(3,338)		(8,769)
Ending balance	24,663	45,903	24,663	45,903
Residential (including multi-family) [Member] | Secured by Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	3,148		3,148		3,920
Collectively evaluated for probable incurred losses	8,797		8,797		15,866
Total allowance for loan losses	11,945		11,945		19,786
Portfolio loans:
Individually evaluated for impairment	46,249		46,249		56,210
Collectively evaluated for probable incurred losses	228,140		228,140		275,900
Total portfolio loans	274,389		274,389		332,110
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	14,138	22,421	19,786	36,139
Acquired loan loss reserve				117
Charge-offs	(3,380)	(5,822)	(10,446)	(16,263)
Recoveries	647	536	4,416	2,477
Net charge-offs	(2,733)	(5,286)	(6,030)	(13,786)
Provision for loan losses	1,647	3,728	1,097	(1,607)
Additional unallocated allowance	(1,107)		(2,908)
Ending balance	11,945	20,863	11,945	20,863
Construction, Land Development and Other Land [Member] | Secured by Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	805		805		3,134
Collectively evaluated for probable incurred losses	2,628		2,628		7,355
Total allowance for loan losses	3,433		3,433		10,489
Portfolio loans:
Individually evaluated for impairment	19,071		19,071		36,638
Collectively evaluated for probable incurred losses	46,700		46,700		68,630
Total portfolio loans	65,771		65,771		105,268
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	5,493	14,868	10,489	17,505
Acquired loan loss reserve				651
Charge-offs	(1,188)	(5,647)	(4,752)	(17,480)
Recoveries	490	322	1,639	3,475
Net charge-offs	(698)	(5,325)	(3,113)	(14,005)
Provision for loan losses	(1,089)	3,298	(3,226)	8,690
Additional unallocated allowance	(273)		(717)
Ending balance	3,433	12,841	3,433	12,841
Commercial And Other Business-Purpose Loans [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,606		1,606		3,732
Collectively evaluated for probable incurred losses	5,676		5,676		10,262
Total allowance for loan losses	7,282		7,282		13,994
Portfolio loans:
Individually evaluated for impairment	16,278		16,278		23,583
Collectively evaluated for probable incurred losses	117,805		117,805		157,766
Total portfolio loans	134,083		134,083		181,349
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	10,191	19,382	13,994	24,098
Acquired loan loss reserve				500
Charge-offs	(658)	(4,842)	(7,218)	(15,664)
Recoveries	957	1,000	5,222	2,959
Net charge-offs	299	(3,842)	(1,996)	(12,705)
Provision for loan losses	(2,654)	572	(3,260)	4,219
Additional unallocated allowance	(554)		(1,456)
Ending balance	7,282	16,112	7,282	16,112
Consumer [Member]
Allowance for loan losses:
Individually evaluated for impairment	32		32		29
Collectively evaluated for probable incurred losses	374		374		662
Total allowance for loan losses	406		406		691
Portfolio loans:
Individually evaluated for impairment	99		99		63
Collectively evaluated for probable incurred losses	10,052		10,052		12,165
Total portfolio loans	10,151		10,151		12,228
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	402	916	691	681
Acquired loan loss reserve				68
Charge-offs	(189)	(137)	(522)	(729)
Recoveries	278	62	424	155
Net charge-offs	89	(75)	(98)	(574)
Provision for loan losses	(42)	573	(76)	1,239
Additional unallocated allowance	(43)		(111)
Ending balance	406	1,414	406	1,414
Other [Member]
Allowance for loan losses:
Collectively evaluated for probable incurred losses	15		15		17
Total allowance for loan losses	15		15		17
Portfolio loans:
Collectively evaluated for probable incurred losses	2,450		2,450		2,781
Total portfolio loans	2,450		2,450		2,781
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	370	64	17	59
Acquired loan loss reserve				1
Charge-offs	23		(656)
Recoveries	63	2	70	4
Net charge-offs	86	2	(586)	4
Provision for loan losses	(429)	(17)	617	(15)
Additional unallocated allowance	(12)		(33)
Ending balance	15	49	15	49
Unallocated [Member]
Allowance for loan losses:
Collectively evaluated for probable incurred losses	18,441		18,441		4,447
Total allowance for loan losses	18,441		18,441		4,447
Summarize activity in the allowance for loan losses [Roll Forward]
Beginning balance	13,114		4,447
Additional unallocated allowance	5,327		13,994
Ending balance	$ 18,441		$ 18,441