Investment Securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-Sale:
Less than 12 Months, Fair Value	$ 156,334	$ 234,467
Less than 12 Months, Unrealized Losses	1,834	4,985
12 Months or More, Fair Value	26,276	4,696
12 Months or More, Unrealized Losses	854	147
Held-to-Maturity:
Less than 12 Months, Fair Value	4,133	28,459
Less than 12 Months, Unrealized Losses	130	468
12 Months or More, Fair Value	3,483	2,564
12 Months or More, Unrealized Losses	37	101
U.S. Treasury notes [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	1,297	16,076
Less than 12 Months, Unrealized Losses	4	76
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
U.S. Agency notes [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	67,239	69,784
Less than 12 Months, Unrealized Losses	779	1,848
12 Months or More, Fair Value	8,736	0
12 Months or More, Unrealized Losses	256	0
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	52,116	64,564
Less than 12 Months, Unrealized Losses	608	1,310
12 Months or More, Fair Value	7,536	3,518
12 Months or More, Unrealized Losses	282	134
Non-taxable Municipal securities [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	28,502	72,867
Less than 12 Months, Unrealized Losses	407	1,621
12 Months or More, Fair Value	8,006	451
12 Months or More, Unrealized Losses	276	2
Held-to-Maturity:
Less than 12 Months, Fair Value	962	20,429
Less than 12 Months, Unrealized Losses	1	251
12 Months or More, Fair Value	3,483	2,564
12 Months or More, Unrealized Losses	37	101
Taxable Municipal securities [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	7,170	9,721
Less than 12 Months, Unrealized Losses	35	82
12 Months or More, Fair Value	450	450
12 Months or More, Unrealized Losses	0	3
Held-to-Maturity:
Less than 12 Months, Fair Value	3,171	8,030
Less than 12 Months, Unrealized Losses	129	217
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Mutual funds [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	0	1,205
Less than 12 Months, Unrealized Losses	0	37
12 Months or More, Fair Value	1,517	277
12 Months or More, Unrealized Losses	38	8
Trust preferred securities [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	0	49
Less than 12 Months, Unrealized Losses	0	1
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Equity securities [Member]
Available-for-Sale:
Less than 12 Months, Fair Value	10	201
Less than 12 Months, Unrealized Losses	1	10
12 Months or More, Fair Value	31	0
12 Months or More, Unrealized Losses	$ 2	$ 0