Loans (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Grades 1,3,6
Loans
Loans receivable	$ 1,855,869,000	$ 1,594,150,000
Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	1,638,890,000	1,419,453,000
Grades 1,3,6 | Florida
Loans
Loans receivable	216,979,000	174,697,000
Grade 7
Loans
Loans receivable	195,914,000	209,424,000
Grade 7 | Illinois/Indiana
Loans
Loans receivable	154,894,000	171,123,000
Grade 7 | Florida
Loans
Loans receivable	41,020,000	38,301,000
Grade 8
Loans
Limit above which loans are quarterly reviewed	500,000
Loans receivable	86,556,000	114,462,000
Grade 8 | Illinois/Indiana
Loans
Loans receivable	61,457,000	84,647,000
Grade 8 | Florida
Loans
Loans receivable	25,099,000	29,815,000
Grade 9
Loans
Loans receivable	72,028,000	88,581,000
Grade 9 | Illinois/Indiana
Loans
Loans receivable	52,153,000	64,299,000
Grade 9 | Florida
Loans
Loans receivable	19,875,000	24,282,000
Grade 10
Loans
Loans receivable	18,489,000	25,104,000
Grade 10 | Illinois/Indiana
Loans
Loans receivable	14,252,000	17,553,000
Grade 10 | Florida
Loans
Loans receivable	4,237,000	7,551,000
Grades 1, 3, 6 and 7
Loans
Loans receivable	2,100,000,000	1,800,000,000
Grades 8, 9, and 10
Loans
Loans receivable	177,100,000	228,100,000
Commercial | Illinois/Indiana
Loans
Weighted Avg. Risk Grade	4.70	4.68
Commercial | Florida
Loans
Weighted Avg. Risk Grade	5.85	5.91
Commercial | Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	466,334,000	346,536,000
Commercial | Grades 1,3,6 | Florida
Loans
Loans receivable	17,311,000	6,359,000
Commercial | Grade 7
Loans
Limit above which loans are annually reviewed	500,000
Commercial | Grade 7 | Illinois/Indiana
Loans
Loans receivable	46,901,000	46,201,000
Commercial | Grade 7 | Florida
Loans
Loans receivable	244,000	3,544,000
Commercial | Grade 8 | Illinois/Indiana
Loans
Loans receivable	14,199,000	12,374,000
Commercial | Grade 8 | Florida
Loans
Loans receivable	3,301,000	162,000
Commercial | Grade 9 | Illinois/Indiana
Loans
Loans receivable	9,073,000	15,677,000
Commercial | Grade 9 | Florida
Loans
Loans receivable	688,000	796,000
Commercial | Grade 10 | Illinois/Indiana
Loans
Loans receivable	1,504,000	2,039,000
Commercial real estate | Illinois/Indiana
Loans
Weighted Avg. Risk Grade	5.53	5.53
Commercial real estate | Florida
Loans
Weighted Avg. Risk Grade	6.19	6.36
Commercial real estate | Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	746,360,000	644,695,000
Commercial real estate | Grades 1,3,6 | Florida
Loans
Loans receivable	119,046,000	80,232,000
Commercial real estate | Grade 7 | Illinois/Indiana
Loans
Loans receivable	85,757,000	110,012,000
Commercial real estate | Grade 7 | Florida
Loans
Loans receivable	21,299,000	20,667,000
Commercial real estate | Grade 8 | Illinois/Indiana
Loans
Loans receivable	29,436,000	50,305,000
Commercial real estate | Grade 8 | Florida
Loans
Loans receivable	11,531,000	13,238,000
Commercial real estate | Grade 9 | Illinois/Indiana
Loans
Loans receivable	26,779,000	28,655,000
Commercial real estate | Grade 9 | Florida
Loans
Loans receivable	15,179,000	19,279,000
Commercial real estate | Grade 10 | Illinois/Indiana
Loans
Loans receivable	6,443,000	9,295,000
Commercial real estate | Grade 10 | Florida
Loans
Loans receivable	3,150,000	4,754,000
Real estate construction
Loans
Limit above which loans are quarterly reviewed	500,000
Real estate construction | Illinois/Indiana
Loans
Weighted Avg. Risk Grade	7.24	7.21
Real estate construction | Florida
Loans
Weighted Avg. Risk Grade	7.04	6.97
Real estate construction | Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	17,759,000	30,710,000
Real estate construction | Grades 1,3,6 | Florida
Loans
Loans receivable	2,026,000	4,137,000
Real estate construction | Grade 7 | Illinois/Indiana
Loans
Loans receivable	16,365,000	7,809,000
Real estate construction | Grade 7 | Florida
Loans
Loans receivable	8,097,000	7,721,000
Real estate construction | Grade 8 | Illinois/Indiana
Loans
Loans receivable	12,420,000	14,162,000
Real estate construction | Grade 8 | Florida
Loans
Loans receivable	767,000	3,172,000
Real estate construction | Grade 9 | Illinois/Indiana
Loans
Loans receivable	10,166,000	14,084,000
Real estate construction | Grade 9 | Florida
Loans
Loans receivable	938,000	942,000
Real estate construction | Grade 10 | Illinois/Indiana
Loans
Loans receivable	2,510,000	3,364,000
Retail real estate | Illinois/Indiana
Loans
Weighted Avg. Risk Grade	3.55	3.62
Retail real estate | Florida
Loans
Weighted Avg. Risk Grade	3.84	3.98
Retail real estate | Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	399,303,000	385,949,000
Retail real estate | Grades 1,3,6 | Florida
Loans
Loans receivable	78,082,000	83,578,000
Retail real estate | Grade 7 | Illinois/Indiana
Loans
Loans receivable	5,717,000	6,729,000
Retail real estate | Grade 7 | Florida
Loans
Loans receivable	11,380,000	6,369,000
Retail real estate | Grade 8 | Illinois/Indiana
Loans
Loans receivable	5,402,000	7,806,000
Retail real estate | Grade 8 | Florida
Loans
Loans receivable	9,500,000	13,225,000
Retail real estate | Grade 9 | Illinois/Indiana
Loans
Loans receivable	6,130,000	5,874,000
Retail real estate | Grade 9 | Florida
Loans
Loans receivable	3,070,000	3,265,000
Retail real estate | Grade 10 | Illinois/Indiana
Loans
Loans receivable	3,795,000	2,855,000
Retail real estate | Grade 10 | Florida
Loans
Loans receivable	1,087,000	2,797,000
Retail other | Illinois/Indiana
Loans
Weighted Avg. Risk Grade	2.98	3.34
Retail other | Florida
Loans
Weighted Avg. Risk Grade	1.75	2.80
Retail other | Grades 1,3,6 | Illinois/Indiana
Loans
Loans receivable	9,134,000	11,563,000
Retail other | Grades 1,3,6 | Florida
Loans
Loans receivable	514,000	391,000
Retail other | Grade 7 | Illinois/Indiana
Loans
Loans receivable	154,000	372,000
Retail other | Grade 8 | Florida
Loans
Loans receivable		18,000
Retail other | Grade 9 | Illinois/Indiana
Loans
Loans receivable	$ 5,000	$ 9,000