Investment Securities, Available-for-sale Securities, Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	$ 444,115	$ 573,432
Gross Unrealized Gains	10,892	2,811
Gross Unrealized Losses	264	2,420
Fair Value	454,743	573,823
U. S. Government Sponsored Enterprises [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	30,000	104,895
Gross Unrealized Gains	3	36
Gross Unrealized Losses	7	419
Fair Value	29,996	104,512
State and Political Subdivisions [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	110	160
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	0
Fair Value	111	162
Mortgage-Backed Securities and Collateralized Mortgage Obligations - Residential [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	301,490	388,537
Gross Unrealized Gains	8,369	2,406
Gross Unrealized Losses	91	1,426
Fair Value	309,768	389,517
Corporate Bonds [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	69,231	30,164
Gross Unrealized Gains	1,048	367
Gross Unrealized Losses	166	95
Fair Value	70,113	30,436
Small Business Administration-Guaranteed Participation Securities [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	42,599	48,991
Gross Unrealized Gains	1,471	0
Gross Unrealized Losses	0	480
Fair Value	44,070	48,511
Other [Member]
Amortized cost and fair value of the securities available for sale [Abstract]
Amortized Cost	685	685
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 685	$ 685