Fair Value (Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross recognized losses related to the credit component of other-than-temporary impairments	$ 25		$ 200		$ 29		$ 581
Nonrecurring | Estimate of Fair Value | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	21,243	[1]			21,243	[1]			15,533	[1]
Nonrecurring | Estimate of Fair Value | Loan foreclosures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	1,901	[1]			1,901	[1]			11,304	[1]
Nonrecurring | Estimate of Fair Value | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	7,503	[1]			7,503	[1]			13,788	[1]
Nonrecurring | Quoted Prices In Active Markets For Identical Assets (Level 1) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0				0				0
Nonrecurring | Quoted Prices In Active Markets For Identical Assets (Level 1) | Loan foreclosures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0				0				0
Nonrecurring | Quoted Prices In Active Markets For Identical Assets (Level 1) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0				0				0
Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0				0				0
Nonrecurring | Significant Other Observable Inputs (Level 2) | Loan foreclosures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0				0				0
Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0				0				0
Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	21,243				21,243				15,533
Gross recognized losses related to the credit component of other-than-temporary impairments	1,331	[2]	1,805	[2]	6,773	[2]	6,221	[2]
Nonrecurring | Significant Unobservable Inputs (Level 3) | Loan foreclosures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	1,901				1,901				11,304
Gross recognized losses related to the credit component of other-than-temporary impairments	282	[3]	1,904	[3]	1,785	[3]	2,721	[3]
Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	7,503				7,503				13,788
Gross recognized losses related to the credit component of other-than-temporary impairments	$ 645	[4]	$ 670	[4]	$ 2,281	[4]	$ 3,777	[4]

[1] These amounts represent the resulting carrying amounts on the consolidated statement of condition for impaired real estate-secured loans and other real estate for which fair value re-measurements took place during the period. Loan foreclosures represent the fair value portion of the carrying amounts of other real estate properties that were re-measured at the point of foreclosure during the period.

[2] Represents additional impairments on loans which are based on the appraised value of the collateral. These impairments are accrued in the allowance for loan losses and charged to provision for loan loss expense.

[3] Represents foreclosures of loans secured by real estate when the foreclosed value is lower than the carrying value of the loan. These amounts are charged to the allowance for loan losses with the fair value of the foreclosed property being recorded in other real estate.

[4] Represents related losses of foreclosed properties that were measured at fair value subsequent to their initial acquisition.