Loans (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Changes in allowance for loan losses
Beginning balance					$ 48,012
Ending Balance	48,491		48,491		48,012
Amount allocated to:
Ending Balance	48,491		48,491		48,012
Loans:
Ending Balance	2,118,224		2,118,224		2,033,107
Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	32,724	34,860	32,579	39,037
Provision for loan loss	844	3,563	1,899	8,620
Charged-off	(1,874)	(5,377)	(3,312)	(15,375)
Recoveries	553	410	1,081	1,174
Ending Balance	32,247	33,456	32,247	33,456
Amount allocated to:
Loans individually evaluated for impairment	1,788		1,788		1,039
Loans collectively evaluated for impairment	30,459		30,459		31,540
Ending Balance	32,247	33,456	32,247	33,456
Loans:
Loans individually evaluated for impairment	24,243		24,243		32,377
Loans collectively evaluated for impairment	1,802,655		1,802,655		1,725,548
Ending Balance	1,826,898		1,826,898		1,757,925
Florida
Changes in allowance for loan losses
Beginning balance	15,049	18,975	15,433	19,469
Provision for loan loss	1,156	937	2,101	880
Charged-off	(406)	(2,661)	(1,866)	(3,750)
Recoveries	445	159	576	811
Ending Balance	16,244	17,410	16,244	17,410
Amount allocated to:
Loans individually evaluated for impairment	1,866		1,866		718
Loans collectively evaluated for impairment	14,378		14,378		14,715
Ending Balance	16,244	17,410	16,244	17,410
Loans:
Loans individually evaluated for impairment	20,838		20,838		23,216
Loans collectively evaluated for impairment	270,488		270,488		251,966
Ending Balance	291,326		291,326		275,182
Commercial | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	6,667	6,982	6,597	9,143
Provision for loan loss	1,016	483	1,254	(1,490)
Charged-off	(239)	(1,407)	(422)	(1,686)
Recoveries	70	73	85	164
Ending Balance	7,514	6,131	7,514	6,131
Amount allocated to:
Loans individually evaluated for impairment	962		962		265
Loans collectively evaluated for impairment	6,552		6,552		6,332
Ending Balance	7,514	6,131	7,514	6,131
Loans:
Loans individually evaluated for impairment	3,071		3,071		7,479
Loans collectively evaluated for impairment	493,225		493,225		415,348
Ending Balance	496,296		496,296		422,827
Commercial | Florida
Changes in allowance for loan losses
Beginning balance	1,485	1,741	1,437	1,939
Provision for loan loss	12	166	35	(397)
Charged-off		(44)		(84)
Recoveries	8	8	33	413
Ending Balance	1,505	1,871	1,505	1,871
Amount allocated to:
Loans collectively evaluated for impairment	1,505		1,505		1,437
Ending Balance	1,505	1,871	1,505	1,871
Loans:
Loans collectively evaluated for impairment	13,360		13,360		10,861
Ending Balance	13,360		13,360		10,861
Commercial Real Estate | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	14,791	18,110	15,023	18,605
Provision for loan loss	(1,177)	(578)	(687)	7,082
Charged-off	(63)	(2,192)	(910)	(10,616)
Recoveries	172	33	297	302
Ending Balance	13,723	15,373	13,723	15,373
Amount allocated to:
Loans individually evaluated for impairment	811		811		634
Loans collectively evaluated for impairment	12,912		12,912		14,389
Ending Balance	13,723	15,373	13,723	15,373
Loans:
Loans individually evaluated for impairment	9,795		9,795		13,308
Loans collectively evaluated for impairment	820,271		820,271		829,654
Ending Balance	830,066		830,066		842,962
Commercial Real Estate | Florida
Changes in allowance for loan losses
Beginning balance	6,106	8,277	6,062	8,413
Provision for loan loss	1,582	348	1,852	393
Charged-off		(1,204)	(245)	(1,420)
Recoveries	(32)	5	(13)	40
Ending Balance	7,656	7,426	7,656	7,426
Amount allocated to:
Loans individually evaluated for impairment	1,866		1,866		235
Loans collectively evaluated for impairment	5,790		5,790		5,827
Ending Balance	7,656	7,426	7,656	7,426
Loans:
Loans individually evaluated for impairment	10,341		10,341		6,573
Loans collectively evaluated for impairment	144,851		144,851		131,597
Ending Balance	155,192		155,192		138,170
Real Estate Construction | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	3,446	3,909	2,527	4,352
Provision for loan loss	62	849	799	532
Charged-off	(1,071)	(454)	(1,071)	(742)
Recoveries	77		259	162
Ending Balance	2,514	4,304	2,514	4,304
Amount allocated to:
Loans collectively evaluated for impairment	2,514		2,514		2,527
Ending Balance	2,514	4,304	2,514	4,304
Loans:
Loans individually evaluated for impairment	5,789		5,789		6,394
Loans collectively evaluated for impairment	60,999		60,999		63,735
Ending Balance	66,788		66,788		70,129
Real Estate Construction | Florida
Changes in allowance for loan losses
Beginning balance	2,326	2,540	2,315	2,936
Provision for loan loss	329	(180)	358	(580)
Charged-off	(22)	(91)	(57)	(160)
Recoveries	60	79	77	152
Ending Balance	2,693	2,348	2,693	2,348
Amount allocated to:
Loans collectively evaluated for impairment	2,693		2,693		2,315
Ending Balance	2,693	2,348	2,693	2,348
Loans:
Loans individually evaluated for impairment	432		432		2,597
Loans collectively evaluated for impairment	18,217		18,217		13,375
Ending Balance	18,649		18,649		15,972
Retail Real Estate | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	7,462	5,514	8,110	6,473
Provision for loan loss	972	2,750	568	2,488
Charged-off	(350)	(1,193)	(622)	(2,054)
Recoveries	172	249	200	413
Ending Balance	8,256	7,320	8,256	7,320
Amount allocated to:
Loans individually evaluated for impairment	15		15		140
Loans collectively evaluated for impairment	8,241		8,241		7,970
Ending Balance	8,256	7,320	8,256	7,320
Loans:
Loans individually evaluated for impairment	5,588		5,588		5,196
Loans collectively evaluated for impairment	418,583		418,583		404,867
Ending Balance	424,171		424,171		410,063
Retail Real Estate | Florida
Changes in allowance for loan losses
Beginning balance	5,128	6,405	5,614	6,160
Provision for loan loss	(763)	608	(134)	1,485
Charged-off	(381)	(1,321)	(1,559)	(2,085)
Recoveries	403	64	466	196
Ending Balance	4,387	5,756	4,387	5,756
Amount allocated to:
Loans individually evaluated for impairment					483
Loans collectively evaluated for impairment	4,387		4,387		5,131
Ending Balance	4,387	5,756	4,387	5,756
Loans:
Loans individually evaluated for impairment	10,065		10,065		14,046
Loans collectively evaluated for impairment	93,561		93,561		95,724
Ending Balance	103,626		103,626		109,770
Retail Other | Illinois/Indiana
Changes in allowance for loan losses
Beginning balance	358	345	322	464
Provision for loan loss	(29)	59	(35)	8
Charged-off	(151)	(131)	(287)	(277)
Recoveries	62	55	240	133
Ending Balance	240	328	240	328
Amount allocated to:
Loans collectively evaluated for impairment	240		240		322
Ending Balance	240	328	240	328
Loans:
Loans collectively evaluated for impairment	9,577		9,577		11,944
Ending Balance	9,577		9,577		11,944
Retail Other | Florida
Changes in allowance for loan losses
Beginning balance	4	12	5	21
Provision for loan loss	(4)	(5)	(10)	(21)
Charged-off	(3)	(1)	(5)	(1)
Recoveries	6	3	13	10
Ending Balance	3	9	3	9
Amount allocated to:
Loans collectively evaluated for impairment	3		3		5
Ending Balance	3	9	3	9
Loans:
Loans collectively evaluated for impairment	499		499		409
Ending Balance	$ 499		$ 499		$ 409