Investment Securities, Amortized Cost, Fair Values, and Unrealized Gains and Losses of Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		$ 448,282	$ 368,109
Gross unrealized gains		1,886	2,842
Gross unrealized losses		1,905	1,814
Fair/Book value		448,263	369,137
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value		58,109	61,396
Gross unrealized gains		339	993
Gross unrealized losses		40	1
Fair value		58,408	62,388
Government Agency & Government-Sponsored Entities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,127	33,536
Gross unrealized gains		114	134
Gross unrealized losses		0	419
Fair/Book value		3,241	33,251
US Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		134,755	73,048
Gross unrealized gains		5	0
Gross unrealized losses		332	164
Fair/Book value		134,428	72,884
US Govt SBA [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		36,532
Gross unrealized gains		42
Gross unrealized losses		260
Fair/Book value		36,314
Mortgage Backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	272,858	261,016
Gross unrealized gains	[1]	1,725	2,708
Gross unrealized losses	[1]	1,313	1,231
Fair/Book value	[1]	273,270	262,493
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		1,010	509
Gross unrealized gains		0	0
Gross unrealized losses		0	0
Fair/Book value		1,010	509
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		58,109	61,396
Gross unrealized gains		339	993
Gross unrealized losses		40	1
Fair value		$ 58,408	$ 62,388

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