Investment Securities, Amortized Cost, Fair Values, and Unrealized Gains and Losses of Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	$ 368,109	$ 362,172
Gross unrealized gains	[1]	2,842	5,030
Gross unrealized losses	[1]	1,814	660
Fair/Book value		369,137	366,542
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value		61,396	63,863
Gross unrealized gains		993	782
Gross unrealized losses		1	10
Fair value		62,388	64,635
Government Agency & Government Sponsored Entities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		33,536	78,051
Gross unrealized gains		134	61
Gross unrealized losses		419	3
Fair/Book value		33,251	78,109
US Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		73,048
Gross unrealized gains		0
Gross unrealized losses		164
Fair/Book value		72,884
Mortgage Backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	261,016	283,636
Gross unrealized gains	[1]	2,708	4,969
Gross unrealized losses	[1]	1,231	657
Fair/Book value	[1]	262,493	287,948
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		509	485
Gross unrealized gains		0	0
Gross unrealized losses		0	0
Fair/Book value		509	485
Obligations of States and Political Subdivisions [Member]
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value		61,396	61,716
Gross unrealized gains		993	782
Gross unrealized losses		1	10
Fair value		$ 62,388	62,488
Other [Member]
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value			2,147
Gross unrealized gains			0
Gross unrealized losses			0
Fair value			$ 2,147

[1] All Mortgage Backed Securities were issued by an agency or government sponsored entity of the U.S. government.