Fair Value Measurements (Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] [Roll Forward]
Balance at beginning of period	$ 887		$ 1,241
Gains and losses (realized and unrealized): included in earnings	(221)	[1]	(1,454)	[1]
Gains and losses (realized and unrealized): Included in other comprehensive income	177		272
Issuances	9,671		0
Transfers out of Level 3	0		828
Balance at end of period	10,514		887
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] [Roll Forward]
Number of pooled trust preferred debt securities	2		2
Securities Available for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	887	[2]	806	[2]
Gains and losses (realized and unrealized): Included in earnings	(221)	[1],[2]	(191)	[1],[2]
Gains and losses (realized and unrealized): Included in other comprehensive income	177	[2]	272	[2]
Issuances	0	[2]	0	[2]
Transfers out of Level 3	0	[2]	0	[2]
Balance at end of period	843	[2]	887	[2]
Mortgage Loans Held for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	[3]
Gains and losses (realized and unrealized): Included in earnings	0	[1],[3]
Gains and losses (realized and unrealized): Included in other comprehensive income	0	[3]
Issuances	9,813	[3]
Transfers out of Level 3	0	[3]
Balance at end of period	9,813	[3]
Derivative Assets / (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] [Roll Forward]
Balance at beginning of period	0	[4]	435	[4]
Gains and losses (realized and unrealized): included in earnings	0	[1],[4]	(1,263)	[1],[4]
Gains and losses (realized and unrealized): Included in other comprehensive income	0	[4]	0	[4]
Issuances	(142)	[4]	0	[4]
Transfers out of Level 3	0	[4]	828	[4]
Balance at end of period	$ (142)	[4]	$ 0	[4]

[1] Losses included in earnings for Level 3 securities available for sale consisted of credit-related impairment losses on the two Level 3 pooled trust preferred debt securities. Credit-related impairment losses of $221 thousand and $191 thousand were recognized in December 31, 2012 and 2011, respectively. The losses included in earnings for Level 3 derivative assets and liabilities, which were comprised of forward loan commitments (interest rate lock commitments and commitments to sell fixed-rate residential mortgages), were included in net gains on loan sales and commissions on loans originated for others in the Consolidated Statements of Income.

[2] During the periods indicated, Level 3 securities available for sale were comprised of two pooled trust preferred debt securities, in the form of collateralized debt obligations.

[3] During the periods indicated, Level 3 mortgage loans held for sale consisted of certain mortgage loans whose fair value was determined utilizing a discounted cash flow analysis.

[4] During the periods indicated, Level 3 derivative assets / liabilities consisted of forward loan commitments (interest rate lock commitments and commitments to sell fixed-rate residential mortgages) whose fair value was determined utilizing a discounted cash flow analysis. During 2011, Level 3 derivative assets / liabilities consisted of certain forward loan commitments that were reclassified out of Level 3 into Level 2 after evaluation during the third quarter of 2011, when it was determined that significant inputs and significant value drivers were observable in active markets.