Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total Outstanding:
Due in year one	$ 222	$ 45,090
Due in year two		5,523
Due in year three	11,182	20,000
Due in year four	25,000	16,247
Due in year five	20,000	30,000
Due in year six		20,000
Total FHLB advances	56,404	136,860
Callable:
Due in year one
Due in year two		5,000
Due in year three	10,000	10,000
Due in year four		10,000
Due in year five	20,000
Due in year six		20,000
Total FHLB advances, callable	30,000	45,000
Fixed Rate:
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral	671,500	698,800
FHLB advances, securities pledged as collateral	$ 6,700	$ 8,300
Minimum [Member]
Fixed Rate:
Year one	0.28%	0.15%
Year two	2.71%	0.28%
Year three	2.75%	2.71%
Year four	1.80%	2.75%
Year five	3.99%	1.80%
Year six		3.99%
Maximum [Member]
Fixed Rate:
Year one	6.15%	7.23%
Year two	3.35%	6.15%
Year three	4.75%	3.35%
Year four	2.91%	4.75%
Year five	4.06%	2.91%
Year six		4.06%