Securities - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale, Amortized Cost
Due in one year or less	$ 72,040
Due after one year through five years	21,782
Due after ten years	236
Available-for-sale, Amortized Cost	275,379	$ 185,931
Available-for-sale, Fair Value
Due in one year or less	71,983
Due after one year through five years	21,760
Due after ten years	244
Available-for-sale Securities, Debt Maturities, Single Maturity Date	93,987
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	94,058
Available-for-sale Securities, Total	276,021	187,565
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	42,130	50,713
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	41,996	50,725
Proceeds from sale of securities
Proceeds from Sale of Available-for-sale Securities	109,444	19,179	$ 6,736
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	181,321
Available-for-sale, Amortized Cost	129,752	100,002
Available-for-sale, Fair Value
Debt maturities without single maturity date	182,034
Available-for-sale Securities, Total	130,705	101,916
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	42,130
Held-to-maturity, Amortized Cost	15,002	16,823
Held-to-maturity, Fair Value
Debt maturities without single maturity date	41,996
Held-to-maturity, Fair Value	15,179	17,185
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Amortized Cost
Available-for-sale, Amortized Cost	51,569	28,821
Available-for-sale, Fair Value
Available-for-sale Securities, Total	51,329	28,605
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	27,128	33,890
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	$ 26,817	$ 33,540