Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4,508	$ 6,364
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	5,451	9,762
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	1,193	1,619
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	927	2,513
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	186	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	616	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	1,083	4,191
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	210	0
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	2,710	3,851
Mirror swaps with counterparties [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	255	0
Mirror swaps with counterparties [Member] | Derivatives not Designated as Hedging Instruments [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 2,779	$ 3,952