Loans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 item mi	Dec. 31, 2013	Mar. 31, 2014 Illinois	Dec. 31, 2013 Illinois	Mar. 31, 2014 Florida	Dec. 31, 2013 Florida	Mar. 31, 2013 Florida	Dec. 31, 2012 Florida	Mar. 31, 2014 Indiana	Dec. 31, 2013 Indiana	Mar. 31, 2014 Commercial	Dec. 31, 2013 Commercial	Mar. 31, 2014 Commercial Illinois	Dec. 31, 2013 Commercial Illinois	Mar. 31, 2014 Commercial Florida	Dec. 31, 2013 Commercial Florida	Mar. 31, 2013 Commercial Florida	Dec. 31, 2012 Commercial Florida	Mar. 31, 2014 Commercial Indiana	Dec. 31, 2013 Commercial Indiana	Mar. 31, 2014 Commercial real estate	Dec. 31, 2013 Commercial real estate	Mar. 31, 2014 Commercial real estate Illinois	Dec. 31, 2013 Commercial real estate Illinois	Mar. 31, 2014 Commercial real estate Florida	Dec. 31, 2013 Commercial real estate Florida	Mar. 31, 2013 Commercial real estate Florida	Dec. 31, 2012 Commercial real estate Florida	Mar. 31, 2014 Commercial real estate Indiana	Dec. 31, 2013 Commercial real estate Indiana	Mar. 31, 2014 Real estate construction	Dec. 31, 2013 Real estate construction	Mar. 31, 2014 Real estate construction Illinois	Dec. 31, 2013 Real estate construction Illinois	Mar. 31, 2014 Real estate construction Florida	Dec. 31, 2013 Real estate construction Florida	Mar. 31, 2013 Real estate construction Florida	Dec. 31, 2012 Real estate construction Florida	Mar. 31, 2014 Real estate construction Indiana	Dec. 31, 2013 Real estate construction Indiana	Mar. 31, 2014 Retail real estate	Dec. 31, 2013 Retail real estate	Mar. 31, 2014 Retail real estate Illinois	Dec. 31, 2013 Retail real estate Illinois	Mar. 31, 2014 Retail real estate Florida	Dec. 31, 2013 Retail real estate Florida	Mar. 31, 2013 Retail real estate Florida	Dec. 31, 2012 Retail real estate Florida	Mar. 31, 2014 Retail real estate Indiana	Dec. 31, 2013 Retail real estate Indiana	Mar. 31, 2014 Retail other	Dec. 31, 2013 Retail other	Mar. 31, 2014 Retail other Illinois	Dec. 31, 2013 Retail other Illinois	Mar. 31, 2014 Retail other Florida	Dec. 31, 2013 Retail other Florida	Mar. 31, 2013 Retail other Florida	Dec. 31, 2012 Retail other Florida	Mar. 31, 2014 Retail other Indiana	Dec. 31, 2013 Retail other Indiana
Loans
Total	$ 2,232,632,000	$ 2,295,300,000	$ 1,763,358,000	$ 1,814,155,000	$ 302,954,000	$ 301,873,000			$ 166,320,000	$ 179,272,000	$ 531,845,000	$ 580,612,000	$ 482,926,000	$ 530,174,000	$ 27,514,000	$ 20,536,000			$ 21,405,000	$ 29,902,000	$ 1,076,726,000	$ 1,092,273,000	$ 790,038,000	$ 800,568,000	$ 162,673,000	$ 160,255,000			$ 124,015,000	$ 131,450,000	$ 74,986,000	$ 78,855,000	$ 54,610,000	$ 55,190,000	$ 10,994,000	$ 17,426,000			$ 9,382,000	$ 6,239,000	$ 540,620,000	$ 534,493,000	$ 427,936,000	$ 419,801,000	$ 101,254,000	$ 103,104,000			$ 11,430,000	$ 11,588,000	$ 8,455,000	$ 9,067,000	$ 7,848,000	$ 8,422,000	$ 519,000	$ 552,000			$ 88,000	$ 93,000
Less held for sale	7,046,000	13,840,000
Total loans before allowance for loan losses	2,225,586,000	2,281,460,000			302,794,000	301,125,000									27,514,000	20,536,000									162,673,000	160,255,000									10,994,000	17,426,000									101,094,000	102,356,000									519,000	552,000
Less allowance for loan losses	47,426,000	47,567,000			12,145,000	13,118,000	15,049,000	15,433,000							2,291,000	1,926,000	1,485,000	1,437,000							5,729,000	5,733,000	6,106,000	6,062,000							233,000	1,168,000	2,326,000	2,315,000							3,888,000	4,287,000	5,128,000	5,614,000							4,000	4,000	4,000	5,000
Net loans	2,178,160,000	2,233,893,000
Net deferred loan origination costs	100,000
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