Investment Securities, Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available-for-Sale:
Amortized Cost	$ 346,609	$ 377,267
Unrealized Gains	6,964	2,739
Unrealized Losses	45	2,028
Fair Value	353,528	377,978
Held-to-Maturity:
Amortized Cost	39,447	22,633
Unrealized Gains	864	95
Unrealized Losses	29	98
Fair Value	40,282	22,630
U.S. Treasury notes [Member]
Available-for-Sale:
Amortized Cost	52,567	72,672
Unrealized Gains	1,414	309
Unrealized Losses	0	135
Fair Value	53,981	72,846
U.S. Agency notes [Member]
Available-for-Sale:
Amortized Cost	113,554	140,876
Unrealized Gains	1,784	164
Unrealized Losses	0	1,151
Fair Value	115,338	139,889
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale:
Amortized Cost	47,701	29,608
Unrealized Gains	592	174
Unrealized Losses	17	404
Fair Value	48,276	29,378
Held-to-Maturity:
Fair Value	0
Certificates of deposit [Member]
Available-for-Sale:
Amortized Cost	248	248
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair Value	248	249
Non-taxable Municipal securities [Member]
Available-for-Sale:
Amortized Cost	108,842	103,900
Unrealized Gains	2,397	1,713
Unrealized Losses	6	134
Fair Value	111,233	105,479
Held-to-Maturity:
Amortized Cost	30,084	22,233
Unrealized Gains	796	95
Unrealized Losses	29	97
Fair Value	30,851	22,231
Taxable Municipal securities [Member]
Available-for-Sale:
Amortized Cost	20,507	26,738
Unrealized Gains	721	337
Unrealized Losses	2	134
Fair Value	21,226	26,941
Held-to-Maturity:
Amortized Cost	9,363	400
Unrealized Gains	68	0
Unrealized Losses	0	1
Fair Value	9,431	399
Mutual funds [Member]
Available-for-Sale:
Amortized Cost	2,508	2,517
Unrealized Gains	8	0
Unrealized Losses	17	51
Fair Value	2,499	2,466
Held-to-Maturity:
Fair Value	0
Trust preferred securities [Member]
Available-for-Sale:
Amortized Cost	49	49
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair Value	49	50
Held-to-Maturity:
Fair Value	0
Equity securities [Member]
Available-for-Sale:
Amortized Cost	633	659
Unrealized Gains	48	40
Unrealized Losses	3	19
Fair Value	678	$ 680
Held-to-Maturity:
Fair Value	$ 0

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

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