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Fair Value Measurement and Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale: Fair Value	$ 458,004	$ 496,815
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,394	5,435
Impaired Financing Receivable, Related Allowance	585	645
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,500	1,500
Collateralized mortgage obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale: Fair Value		$ 2,120

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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