Investment Securities, Securities Available-for-Sale (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		$ 499,639	$ 482,757
Gross unrealized gains		1,208	1,016
Gross unrealized losses		5,451	2,177
Fair/Book value		495,396	481,596
Government Agency & Government-Sponsored Entities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,033	3,080
Gross unrealized gains		6	48
Gross unrealized losses		0	0
Fair/Book value		3,039	3,128
US Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		164,672	144,606
Gross unrealized gains		0	0
Gross unrealized losses		158	442
Fair/Book value		164,514	144,164
US Govt SBA [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		15,601	29,559
Gross unrealized gains		6	29
Gross unrealized losses		160	208
Fair/Book value		15,447	29,380
Mortgage Backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	310,982	302,502
Gross unrealized gains	[1]	1,196	939
Gross unrealized losses	[1]	5,133	1,527
Fair/Book value	[1]	307,045	301,914
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		5,351	3,010
Gross unrealized gains		0	0
Gross unrealized losses		0	0
Fair/Book value		$ 5,351	$ 3,010

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