Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 407,833	$ 361,844
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	6,049	8,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,764)	(10)
Securities held to maturity, fair value	408,118	369,851
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	2,679	2,766
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	123	138
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	2,802	2,904
US Government Agency Debt Securities Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	58,484	36,799
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	992	1,441
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(512)	0
Securities held to maturity, fair value	58,964	38,240
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	279,970	277,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	4,134	5,389
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,763)	(10)
Securities held to maturity, fair value	280,341	282,730
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	9,121	9,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	316	344
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	9,437	10,081
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	35,109	34,391
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	484	705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(264)	0
Securities held to maturity, fair value	35,329	35,096
Debt Security, Government, Non-US [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	800	800
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	$ 800