Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 268,638	$ 337,123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	8,370	2,073
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(20)	(478)
Securities held to maturity, fair value	276,988	338,718
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	2,937	3,392
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	151	57
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	3,088	3,449
US Government Agency Debt Securities Commercial [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	41,334	51,291
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,537	18
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(184)
Securities held to maturity, fair value	42,871	51,125
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	171,100	229,667
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	5,646	1,377
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(19)	(294)
Securities held to maturity, fair value	176,727	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	10,334	12,081
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	375	67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	10,709	12,148
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	42,133	40,092
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	661	554
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1)	0
Securities held to maturity, fair value	42,793	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