Investments Maturities of AFS Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 44,854
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	301,396
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	133,014
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	201,806
Investment securities available for sale at amortized cost	681,070	694,832
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	45,293
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	303,023
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	133,943
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	201,331
Available-for-sale Securities	$ 683,590	$ 691,729