Investment Securities, Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-Sale, Amortized Cost
Due within one year	$ 10,477
Due from one to five years	109,760
Due from five to ten years	109,140
Due after ten years	7,512
Available-for-sale, amortized cost	236,889
Available-for-sale, amortized cost	311,629	$ 324,662
Available-for-Sale, Fair Value
Due within one year	10,500
Due from one to five years	110,262
Due from five to ten years	108,443
Due after ten years	7,238
Available-for-sale, fair value	236,443
Available-for-sale, at fair value	310,404	320,659
Held-to-Maturity, Amortized Cost
Due within one year	6,171
Due from one to five years	4,065
Due from five to ten years	10,322
Due after ten years	16,302
Amortized Cost	36,860	41,003
Held-to-Maturity, Fair Value
Due within one year	6,196
Due from one to five years	4,050
Due from five to ten years	10,315
Due after ten years	16,244
Held-to-maturity, fair value	36,805	40,490
Available-for-sale securities pledged as collateral	170,890	149,990
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale, Amortized Cost
Available-for-sale, amortized cost	71,541	72,402
Available-for-Sale, Fair Value
Available-for-sale, at fair value	70,721	71,047
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	0
Mutual funds [Member]
Available-for-Sale, Amortized Cost
Available-for-sale, amortized cost	2,576	2,527
Available-for-Sale, Fair Value
Available-for-sale, at fair value	2,539	2,482
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	0
Trust preferred securities [Member]
Available-for-Sale, Amortized Cost
Available-for-sale, amortized cost	49	49
Available-for-Sale, Fair Value
Available-for-sale, at fair value	50	48
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	0
Equity securities [Member]
Available-for-Sale, Amortized Cost
Available-for-sale, amortized cost	574	632
Available-for-Sale, Fair Value
Available-for-sale, at fair value	651	$ 677
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	$ 0