Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 318,256	$ 337,123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	9,336	2,073
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(478)
Securities held to maturity, fair value	327,592	338,718
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	3,298	3,392
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	164	57
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	3,462	3,449
US Government Agency Debt Securities Commercial [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	48,554	51,291
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	512	18
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(184)
Securities held to maturity, fair value	49,066	51,125
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	216,547	229,667
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	7,712	1,377
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(294)
Securities held to maturity, fair value	224,259	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	11,793	12,081
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	417	67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	12,210	12,148
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	37,464	40,092
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	531	554
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	37,995	40,646
Debt Security, Government, Non-US [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	600	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	$ 600	$ 600