Securities (Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	$ 70,876
Available for sale debt securities maturities 1-5 years amortized cost	187,480
Available for sale debt securities maturities 5-10 years amortized cost	185,358
Available for sale debt securities maturities after 10 years amortized cost	116,253
Available for sale debt securities maturities total amortized cost	559,967
Available for sale debt securities maturities within 1 year fair value	72,201
Available for sale debt securities maturities 1-5 years fair value	190,915
Available for sale debt securities maturities 5-10 years fair value	187,402
Available for sale debt securities maturities after 10 years fair value	113,738
Available for sale debt securities fair value	564,256
Held to maturity debt securities maturities within 1 year amortized cost	4,019
Held to maturity debt securities maturities 1-5 years amortized cost	8,835
Held to maturity debt securities maturities 5-10 years amortized cost	3,394
Held to maturity debt securities maturities after 10 years amortized cost	600
Held to maturity securities	16,848	$ 20,023
Held to maturity debt securities maturities within 1 year fair value	4,172
Held to maturity debt securities maturities 1-5 years fair value	9,173
Held to maturity debt securities maturities 5-10 years fair value	3,524
Held to maturity debt securities maturities after 10 years fair value	623
Held to maturity securities fair value	$ 17,492	$ 20,516