Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 6,364	$ 6,377
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	9,762	9,051
Interest rate swap contracts [Member] | Derivatives Designated as Cash Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Interest rate swap contracts [Member] | Derivatives Designated as Cash Flow Hedging Instruments [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	1,619	1,802
Commitments to originate fixed rate mortgage loans to be sold [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	2,513	1,864
Commitments to originate fixed rate mortgage loans to be sold [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Commitments to sell fixed rate mortgage loans [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Commitments to sell fixed rate mortgage loans [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	4,191	2,580
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,851	4,513
Mirror swaps with counterparties [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Mirror swaps with counterparties [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 3,952	$ 4,669