Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 297,986	$ 337,123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	9,888	2,073
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(478)
Securities held to maturity, fair value	307,874	338,718
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	3,008	3,392
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	191	57
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	3,199	3,449
US Government Agency Debt Securities Commercial [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	46,803	51,291
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,646	18
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(184)
Securities held to maturity, fair value	48,449	51,125
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	197,342	229,667
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	6,974	1,377
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(294)
Securities held to maturity, fair value	204,316	230,750
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	10,894	12,081
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	395	67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	11,289	12,148
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	39,139	40,092
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	682	554
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	39,821	40,646
Debt Security, Government, Non-US [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	800	600
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	$ 800	$ 600