Investment Securities, Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-Sale:
Amortized Cost	$ 329,895	$ 324,662
Unrealized Gains	1,257	1,129
Unrealized Losses	4,476	5,132
Fair Value	326,676	320,659
Held-to-Maturity:
Amortized Cost	38,455	41,003
Unrealized Gains	103	56
Unrealized Losses	546	569
Fair Value	38,012	40,490
U.S. Treasury notes [Member]
Available-for-Sale:
Amortized Cost	33,236	28,180
Unrealized Gains	102	41
Unrealized Losses	33	76
Fair Value	33,305	28,145
U.S. Agency notes [Member]
Available-for-Sale:
Amortized Cost	91,911	87,098
Unrealized Gains	137	150
Unrealized Losses	1,723	1,848
Fair Value	90,325	85,400
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale:
Amortized Cost	69,162	72,402
Unrealized Gains	79	89
Unrealized Losses	1,273	1,444
Fair Value	67,968	71,047
Held-to-Maturity:
Amortized Cost	0
Fair Value	0
Non-taxable Municipal securities [Member]
Available-for-Sale:
Amortized Cost	113,180	114,064
Unrealized Gains	640	574
Unrealized Losses	1,334	1,623
Fair Value	112,486	113,015
Held-to-Maturity:
Amortized Cost	33,279	31,015
Unrealized Gains	103	56
Unrealized Losses	368	352
Fair Value	33,014	30,719
Taxable Municipal securities [Member]
Available-for-Sale:
Amortized Cost	19,189	19,710
Unrealized Gains	224	220
Unrealized Losses	62	85
Fair Value	19,351	19,845
Held-to-Maturity:
Amortized Cost	5,176	9,988
Unrealized Gains	0	0
Unrealized Losses	178	217
Fair Value	4,998	9,771
Mutual funds [Member]
Available-for-Sale:
Amortized Cost	2,536	2,527
Unrealized Gains	0	0
Unrealized Losses	45	45
Fair Value	2,491	2,482
Held-to-Maturity:
Amortized Cost	0
Fair Value	0
Trust preferred securities [Member]
Available-for-Sale:
Amortized Cost	49	49
Unrealized Gains	0	0
Unrealized Losses	0	1
Fair Value	49	48
Held-to-Maturity:
Amortized Cost	0
Fair Value	0
Equity securities [Member]
Available-for-Sale:
Amortized Cost	632	632
Unrealized Gains	75	55
Unrealized Losses	6	10
Fair Value	701	$ 677
Held-to-Maturity:
Amortized Cost	0
Fair Value	$ 0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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