Loans (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Changes in allowance for loan losses
Beginning balance			$ 48,012
Provision for loan loss			6,000	13,000
Ending Balance	47,964		47,964
Amount allocated to:
Ending Balance	47,964		47,964
Loans:
Ending Balance	2,233,105		2,233,105		2,033,107
Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	32,247	33,456	32,579	39,037
Provision for loan loss	1,511	2,637	3,410	11,257
Charged-off	(848)	(4,039)	(4,160)	(19,414)
Recoveries	374	194	1,455	1,368
Ending Balance	33,284	32,248	33,284	32,248
Amount allocated to:
Loans individually evaluated for impairment	2,773		2,773		1,039
Loans collectively evaluated for impairment	30,511		30,511		31,540
Ending Balance	33,284	32,248	33,284	32,248
Loans:
Loans individually evaluated for impairment	21,650		21,650		32,377
Loans collectively evaluated for impairment	1,904,246		1,904,246		1,725,548
Ending Balance	1,925,896		1,925,896		1,757,925
Florida
Changes in allowance for loan losses
Beginning balance	16,244	17,410	15,433	19,469
Provision for loan loss	489	863	2,590	1,743
Charged-off	(2,354)	(1,573)	(4,220)	(5,323)
Recoveries	301	265	877	1,076
Ending Balance	14,680	16,965	14,680	16,965
Amount allocated to:
Loans individually evaluated for impairment	214		214		718
Loans collectively evaluated for impairment	14,466		14,466		14,715
Ending Balance	14,680	16,965	14,680	16,965
Loans:
Loans individually evaluated for impairment	15,755		15,755		23,216
Loans collectively evaluated for impairment	291,454		291,454		251,966
Ending Balance	307,209		307,209		275,182
Commercial | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	7,514	6,131	6,597	9,143
Provision for loan loss	363	1,209	1,617	(281)
Charged-off	(241)	(1,194)	(663)	(2,880)
Recoveries	37	15	122	179
Ending Balance	7,673	6,161	7,673	6,161
Amount allocated to:
Loans individually evaluated for impairment	847		847		265
Loans collectively evaluated for impairment	6,826		6,826		6,332
Ending Balance	7,673	6,161	7,673	6,161
Loans:
Loans individually evaluated for impairment	2,812		2,812		7,479
Loans collectively evaluated for impairment	535,199		535,199		415,348
Ending Balance	538,011		538,011		422,827
Commercial | Florida
Changes in allowance for loan losses
Beginning balance	1,505	1,871	1,437	1,939
Provision for loan loss	687	(125)	722	(522)
Charged-off		(6)		(90)
Recoveries	22	110	55	523
Ending Balance	2,214	1,850	2,214	1,850
Amount allocated to:
Loans collectively evaluated for impairment	2,214		2,214		1,437
Ending Balance	2,214	1,850	2,214	1,850
Loans:
Loans collectively evaluated for impairment	21,544		21,544		10,861
Ending Balance	21,544		21,544		10,861
Commercial Real Estate | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	13,723	15,373	15,023	18,605
Provision for loan loss	316	1,403	(371)	8,485
Charged-off	(44)	(1,716)	(954)	(12,332)
Recoveries	145	6	442	308
Ending Balance	14,140	15,066	14,140	15,066
Amount allocated to:
Loans individually evaluated for impairment	954		954		634
Loans collectively evaluated for impairment	13,186		13,186		14,389
Ending Balance	14,140	15,066	14,140	15,066
Loans:
Loans individually evaluated for impairment	9,103		9,103		13,308
Loans collectively evaluated for impairment	885,672		885,672		829,654
Ending Balance	894,775		894,775		842,962
Commercial Real Estate | Florida
Changes in allowance for loan losses
Beginning balance	7,656	7,426	6,062	8,413
Provision for loan loss	1,504	35	3,356	428
Charged-off	(2,298)	(229)	(2,543)	(1,649)
Recoveries	2	3	(11)	43
Ending Balance	6,864	7,235	6,864	7,235
Amount allocated to:
Loans individually evaluated for impairment	123		123		235
Loans collectively evaluated for impairment	6,741		6,741		5,827
Ending Balance	6,864	7,235	6,864	7,235
Loans:
Loans individually evaluated for impairment	5,360		5,360		6,573
Loans collectively evaluated for impairment	164,845		164,845		131,597
Ending Balance	170,205		170,205		138,170
Real Estate Construction | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	2,514	4,304	2,527	4,352
Provision for loan loss	(241)	324	558	856
Charged-off		(538)	(1,071)	(1,280)
Recoveries	21		280	162
Ending Balance	2,294	4,090	2,294	4,090
Amount allocated to:
Loans individually evaluated for impairment	218		218
Loans collectively evaluated for impairment	2,076		2,076		2,527
Ending Balance	2,294	4,090	2,294	4,090
Loans:
Loans individually evaluated for impairment	4,655		4,655		6,394
Loans collectively evaluated for impairment	54,565		54,565		63,735
Ending Balance	59,220		59,220		70,129
Real Estate Construction | Florida
Changes in allowance for loan losses
Beginning balance	2,693	2,348	2,315	2,936
Provision for loan loss	(1,690)	(64)	(1,332)	(644)
Charged-off	2	(176)	(55)	(336)
Recoveries	225	109	302	261
Ending Balance	1,230	2,217	1,230	2,217
Amount allocated to:
Loans collectively evaluated for impairment	1,230		1,230		2,315
Ending Balance	1,230	2,217	1,230	2,217
Loans:
Loans individually evaluated for impairment	430		430		2,597
Loans collectively evaluated for impairment	11,398		11,398		13,375
Ending Balance	11,828		11,828		15,972
Retail Real Estate | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	8,256	7,320	8,110	6,473
Provision for loan loss	1,024	(358)	1,592	2,130
Charged-off	(446)	(463)	(1,068)	(2,517)
Recoveries	112	130	312	543
Ending Balance	8,946	6,629	8,946	6,629
Amount allocated to:
Loans individually evaluated for impairment	754		754		140
Loans collectively evaluated for impairment	8,192		8,192		7,970
Ending Balance	8,946	6,629	8,946	6,629
Loans:
Loans individually evaluated for impairment	5,080		5,080		5,196
Loans collectively evaluated for impairment	419,517		419,517		404,867
Ending Balance	424,597		424,597		410,063
Retail Real Estate | Florida
Changes in allowance for loan losses
Beginning balance	4,387	5,756	5,614	6,160
Provision for loan loss	(9)	1,021	(143)	2,506
Charged-off	(56)	(1,162)	(1,615)	(3,247)
Recoveries	47	40	513	236
Ending Balance	4,369	5,655	4,369	5,655
Amount allocated to:
Loans individually evaluated for impairment	91		91		483
Loans collectively evaluated for impairment	4,278		4,278		5,131
Ending Balance	4,369	5,655	4,369	5,655
Loans:
Loans individually evaluated for impairment	9,965		9,965		14,046
Loans collectively evaluated for impairment	93,153		93,153		95,724
Ending Balance	103,118		103,118		109,770
Retail Other | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	240	328	322	464
Provision for loan loss	49	59	14	67
Charged-off	(117)	(128)	(404)	(405)
Recoveries	59	43	299	176
Ending Balance	231	302	231	302
Amount allocated to:
Loans collectively evaluated for impairment	231		231		322
Ending Balance	231	302	231	302
Loans:
Loans collectively evaluated for impairment	9,293		9,293		11,944
Ending Balance	9,293		9,293		11,944
Retail Other | Florida
Changes in allowance for loan losses
Beginning balance	3	9	5	21
Provision for loan loss	(3)	(4)	(13)	(25)
Charged-off	(2)		(7)	(1)
Recoveries	5	3	18	13
Ending Balance	3	8	3	8
Amount allocated to:
Loans collectively evaluated for impairment	3		3		5
Ending Balance	3	8	3	8
Loans:
Loans collectively evaluated for impairment	514		514		409
Ending Balance	$ 514		$ 514		$ 409