Loans (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 item mile	Dec. 31, 2011	Sep. 30, 2012 Illinois	Dec. 31, 2011 Illinois	Sep. 30, 2012 Florida	Jun. 30, 2012 Florida	Dec. 31, 2011 Florida	Sep. 30, 2011 Florida	Jun. 30, 2011 Florida	Dec. 31, 2010 Florida	Sep. 30, 2012 Indiana	Dec. 31, 2011 Indiana	Sep. 30, 2012 Commercial	Dec. 31, 2011 Commercial	Sep. 30, 2012 Commercial Illinois	Dec. 31, 2011 Commercial Illinois	Sep. 30, 2012 Commercial Florida	Jun. 30, 2012 Commercial Florida	Dec. 31, 2011 Commercial Florida	Sep. 30, 2011 Commercial Florida	Jun. 30, 2011 Commercial Florida	Dec. 31, 2010 Commercial Florida	Sep. 30, 2012 Commercial Indiana	Dec. 31, 2011 Commercial Indiana	Sep. 30, 2012 Commercial real estate	Dec. 31, 2011 Commercial real estate	Sep. 30, 2012 Commercial real estate Illinois	Dec. 31, 2011 Commercial real estate Illinois	Sep. 30, 2012 Commercial real estate Florida	Jun. 30, 2012 Commercial real estate Florida	Dec. 31, 2011 Commercial real estate Florida	Sep. 30, 2011 Commercial real estate Florida	Jun. 30, 2011 Commercial real estate Florida	Dec. 31, 2010 Commercial real estate Florida	Sep. 30, 2012 Commercial real estate Indiana	Dec. 31, 2011 Commercial real estate Indiana	Sep. 30, 2012 Real estate construction	Dec. 31, 2011 Real estate construction	Sep. 30, 2012 Real estate construction Illinois	Dec. 31, 2011 Real estate construction Illinois	Sep. 30, 2012 Real estate construction Florida	Jun. 30, 2012 Real estate construction Florida	Dec. 31, 2011 Real estate construction Florida	Sep. 30, 2011 Real estate construction Florida	Jun. 30, 2011 Real estate construction Florida	Dec. 31, 2010 Real estate construction Florida	Sep. 30, 2012 Real estate construction Indiana	Dec. 31, 2011 Real estate construction Indiana	Sep. 30, 2012 Retail real estate	Dec. 31, 2011 Retail real estate	Sep. 30, 2012 Retail real estate Illinois	Dec. 31, 2011 Retail real estate Illinois	Sep. 30, 2012 Retail real estate Florida	Jun. 30, 2012 Retail real estate Florida	Dec. 31, 2011 Retail real estate Florida	Sep. 30, 2011 Retail real estate Florida	Jun. 30, 2011 Retail real estate Florida	Dec. 31, 2010 Retail real estate Florida	Sep. 30, 2012 Retail real estate Indiana	Dec. 31, 2011 Retail real estate Indiana	Sep. 30, 2012 Retail other	Dec. 31, 2011 Retail other	Sep. 30, 2012 Retail other Illinois	Dec. 31, 2011 Retail other Illinois	Sep. 30, 2012 Retail other Florida	Jun. 30, 2012 Retail other Florida	Dec. 31, 2011 Retail other Florida	Sep. 30, 2011 Retail other Florida	Jun. 30, 2011 Retail other Florida	Dec. 31, 2010 Retail other Florida	Sep. 30, 2012 Retail other Indiana	Dec. 31, 2011 Retail other Indiana
Loans
Total	$ 2,035,319,000	$ 2,051,344,000	$ 1,644,120,000	$ 1,669,967,000	$ 278,964,000		$ 283,147,000				$ 112,235,000	$ 98,230,000	$ 399,744,000	$ 407,855,000	$ 365,737,000	$ 375,238,000	$ 13,639,000		$ 10,830,000				$ 20,368,000	$ 21,787,000	$ 965,364,000	$ 980,216,000	$ 770,882,000	$ 793,769,000	$ 137,822,000		$ 135,360,000				$ 56,660,000	$ 51,087,000	$ 108,342,000	$ 104,865,000	$ 69,383,000	$ 72,569,000	$ 14,713,000		$ 16,186,000				$ 24,246,000	$ 16,110,000	$ 548,891,000	$ 540,146,000	$ 425,641,000	$ 410,844,000	$ 112,407,000		$ 120,190,000				$ 10,843,000	$ 9,112,000	$ 12,978,000	$ 18,262,000	$ 12,477,000	$ 17,547,000	$ 383,000		$ 581,000				$ 118,000	$ 134,000
Less held for sale	24,415,000	15,249,000
Total loans before allowance for loan losses	2,010,904,000	2,036,095,000			277,951,000		281,953,000										13,639,000		10,830,000										137,822,000		135,360,000										14,713,000		16,186,000										111,394,000		118,996,000										383,000		581,000
Less allowance for loan losses	49,213,000	58,506,000			16,965,000	17,410,000	19,469,000	24,422,000	28,596,000	29,849,000							1,850,000	1,871,000	1,939,000	2,191,000	2,563,000	2,013,000							7,235,000	7,426,000	8,413,000	12,348,000	12,466,000	13,291,000							2,217,000	2,348,000	2,936,000	3,191,000	4,348,000	4,717,000							5,655,000	5,756,000	6,160,000	6,666,000	9,181,000	9,748,000							8,000	9,000	21,000	26,000	38,000	80,000
Net loans	1,961,691,000	1,977,589,000
Net deferred loan origination costs	700,000	700,000
Minimum target period for lending via intermediate term loans	0 years
Maximum target period for lending via intermediate term loans	7 years
Geographical area from lending offices which attempt is made to lend short and intermediate term loans (in miles)	125
Direct and indirect maximum total borrowing relationship limit	20,000,000
Borrowing relationships, threshold above which board of directors will review annually	$ 20,000,000
Number of primary areas for lending loan	5