Investment Securities, Securities Available-for-Sale (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		$ 467,628	$ 482,757	$ 455,367
Gross unrealized gains		278	1,016	2,110
Gross unrealized losses		9,595	2,177	1,154
Fair/Book value		458,311	481,596	456,323
Government Agency & Government-Sponsored Entities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,045	3,080	3,091
Gross unrealized gains		7	48	78
Gross unrealized losses		0	0	0
Fair/Book value		3,052	3,128	3,169
US Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		164,671	144,606	144,657
Gross unrealized gains		0	0	2
Gross unrealized losses		463	442	249
Fair/Book value		164,208	144,164	144,410
US Govt SBA [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		17,144	29,559	31,732
Gross unrealized gains		6	29	45
Gross unrealized losses		177	208	86
Fair/Book value		16,973	29,380	31,691
Mortgage Backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	279,757	302,502	274,877
Gross unrealized gains	[1]	265	939	1,985
Gross unrealized losses	[1]	8,955	1,527	819
Fair/Book value	[1]	271,067	301,914	276,043
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,011	3,010	1,010
Gross unrealized gains		0	0	0
Gross unrealized losses		0	0	0
Fair/Book value		$ 3,011	$ 3,010	$ 1,010

[1] All Mortgage Backed Securities consist of securities collateralized by residential real estate and were issued by an agency or government sponsored entity of the U.S. government.