Borrowed Funds (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of borrowed funds
Due within 12 months, Weighted average rate	3.07%	2.80%
Due beyond 12 months but within 2 years, Weighted average rate	3.16%	3.62%
Due beyond 2 years but within 3 years, Weighted average rate	2.96%	2.88%
Due beyond 3 years but within 4 years, Weighted average rate	2.25%	3.36%
Due beyond 4 years but within 5 years, Weighted average rate	1.16%	2.15%
Due beyond 5 years, Weighted average rate	3.61%	3.61%
Due within 12 months	$ 70,759	$ 30,684
Due beyond 12 months but within 2 years	88,317	72,647
Due beyond 2 years but within 3 years	19,288	71,392
Due beyond 3 years but within 4 years	7,462	14,613
Due beyond 4 years but within 5 years	7,853	8,019
Due beyond 5 years	10,000	10,000
FHLB advances	203,679	207,355
Repurchase agreements [Member]
Summary of borrowed funds
Due within 12 months, Weighted average rate	2.98%	3.12%
Due beyond 12 months but within 2 years, Weighted average rate	3.28%	3.30%
Due beyond 2 years but within 3 years, Weighted average rate	4.12%	3.07%
Due beyond 3 years but within 4 years, Weighted average rate		4.12%
Due beyond 4 years but within 5 years, Weighted average rate	4.28%
Due beyond 5 years, Weighted average rate	4.49%	4.42%
Due within 12 months	148,000	93,000
Due beyond 12 months but within 2 years	60,000	130,000
Due beyond 2 years but within 3 years	10,000	40,000
Due beyond 3 years but within 4 years		10,000
Due beyond 4 years but within 5 years	25,000
Due beyond 5 years	45,000	70,000
FHLB advances	288,000	343,000
ESOP borrowings [Member]
Summary of borrowed funds
Due within 12 months, Weighted average rate	4.68%	4.68%
Due beyond 12 months but within 2 years, Weighted average rate	4.68%	4.68%
Due beyond 2 years but within 3 years, Weighted average rate	4.68%	4.68%
Due beyond 3 years but within 4 years, Weighted average rate	4.68%	4.68%
Due beyond 4 years but within 5 years, Weighted average rate		4.68%
Due within 12 months, Amount	1,000	1,000
Due beyond 12 months but within 2 years	1,000	1,000
Due beyond 2 years but within 3 years	1,000	1,000
Due beyond 3 years but within 4 years	500	1,000
Due beyond 4 years but within 5 years		250
Total	3,500	4,250
Corporate borrowings [Member]
Summary of borrowed funds
Due within 12 months, Weighted average rate	6.30%	6.30%
Due beyond 12 months but within 2 years, Weighted average rate	6.30%	6.30%
Due beyond 2 years but within 3 years, Weighted average rate		6.30%
Due within 12 months, Amount	1,400	1,400
Due beyond 12 months but within 2 years	1,400	1,400
Due beyond 2 years but within 3 years		1,400
Total	2,800	4,200
Borrowings for joint ventures [Member]
Summary of borrowed funds
Due beyond 2 years but within 3 years, Weighted average rate	3.75%	3.75%
Due beyond 2 years but within 3 years	352	1,762
Junior subordinated notes [Member]
Summary of borrowed funds
Due beyond 5 years, Weighted average rate	2.54%	2.56%
Due beyond 5 years	$ 46,393	$ 46,393