Investment Securities, Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-Sale, Amortized Cost
Due within one year	$ 12,940
Due from one to five years	110,596
Due from five to ten years	121,060
Due after ten years	7,531
Available-for-sale, amortized cost	252,127
Available-for-sale, amortized cost	330,303	$ 324,662
Available-for-Sale, Fair Value
Due within one year	12,981
Due from one to five years	111,142
Due from five to ten years	120,190
Due after ten years	7,242
Available-for-sale, fair value	251,555
Available-for-sale, at fair value	328,788	320,659
Held-to-Maturity, Amortized Cost
Due within one year	6,191
Due from one to five years	4,082
Due from five to ten years	10,322
Due after ten years	17,842
Amortized Cost	38,437	41,003
Held-to-Maturity, Fair Value
Due within one year	6,221
Due from one to five years	4,064
Due from five to ten years	10,266
Due after ten years	17,735
Held-to-maturity, fair value	38,286	40,490
Available-for-sale securities pledged as collateral	195,610	149,990
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale, Amortized Cost
Available-for-sale, amortized cost	74,949	72,402
Available-for-Sale, Fair Value
Available-for-sale, at fair value	73,961	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	2,546	2,527
Available-for-Sale, Fair Value
Available-for-sale, at fair value	2,507	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	632	632
Available-for-Sale, Fair Value
Available-for-sale, at fair value	715	$ 677
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	$ 0