Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 57,580
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	89,178
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	52,796
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	5,143
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	204,697
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	516,829
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	312,132
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value	57,564
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value	90,621
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value	54,607
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value	4,002
Available-for-sale Securities, Debt Maturities, Single Maturity Date	206,794
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	312,054
Fair Value	518,848	$ 377,856
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	50,632
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	29,486
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	5,090
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0
Held-to-maturity, at amortized cost (estimated fair value of $85,737 at December 31, 2015 and $53,937 at December 31, 2014)	85,208	53,650
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	50,855
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	29,804
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	5,078
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0
Held-to-maturity Securities, Fair Value	$ 85,737	$ 53,937