Investment Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Security	Dec. 31, 2018 USD ($)
Investment Securities, Qualitative Disclosure [Abstract]
Number of investment securities held | Security	595
Less than 12 months, number of positions | Security	29
12 months or more, number of positions | Security	74
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 133,698	$ 180,524
Less than 12 months unrealized loss	94	563
12 months or more fair value	5,911	255,418
12 months or more unrealized loss	118	4,888
Total fair value	139,609	435,942
Total unrealized loss	212	5,451
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	355
Less than 12 months unrealized loss	12
12 months or more fair value	0
12 months or more unrealized loss	0
Total fair value	355
Total unrealized loss	12
Obligations of States and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	355
Less than 12 months unrealized loss	12
12 months or more fair value	0
12 months or more unrealized loss	0
Total fair value	355
Total unrealized loss	$ 12
Less than 12 months, number of positions | Security	2
12 months or more, number of positions | Security	0
Municipal Bonds [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Percentage of portfolio rated at either issue or issuer level	100.00%
Government Agency & Government-Sponsored Entities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
US Treasury Notes [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value		124,985
Less than 12 months unrealized loss		7
12 months or more fair value		39,529
12 months or more unrealized loss		151
Total fair value		164,514
Total unrealized loss		158
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
US Government Agency SBA [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 2,693	3,250
Less than 12 months unrealized loss	6	28
12 months or more fair value	5,198	8,618
12 months or more unrealized loss	107	132
Total fair value	7,891	11,868
Total unrealized loss	$ 113	160
Less than 12 months, number of positions | Security	18
12 months or more, number of positions | Security	53
Mortgage Backed Securities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 131,005	52,289
Less than 12 months unrealized loss	88	528
12 months or more fair value	713	207,271
12 months or more unrealized loss	11	4,605
Total fair value	131,718	259,560
Total unrealized loss	$ 99	$ 5,133
Less than 12 months, number of positions | Security	9
12 months or more, number of positions | Security	21