Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Investment securities held-to-maturity (fair value $182,376 and $194,886 at September 30, 2020 and December 31, 2019, respectively)	$ 176,817			$ 192,052
Securities Held-to-Maturity, Gross Unrealized Gains	5,559			2,944
Securities Held-to-Maturity, Gross Unrealized Losses	0			(110)
Securities Held-to-Maturity, Fair Value	182,376			194,886
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-sale, Amortized Cost	191,202			251,014
Securities Available-for-Sale, Debt Securities, Fair Value	189,227			246,924
Debt Securities, Available-For-Sale And Held-To-Maturity, Amortized Cost	191,202			251,014
Securities Available-for-Sale,Gross Unrealized Gain	3,941			1,415
Securities Available-for-Sale, Gross Unrealized Loss	(5,224)			(5,505)
Securities Available-for-Sale, Fair Value	189,227			246,924
Debt securities, available-for-sale, allowance for credit loss	692
U.S. Government Corporations and Agencies [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 1 year to five year	6,998			6,997
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	202			66
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	0			0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Year Two Through Five	0
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	7,200			7,063
Investment securities held-to-maturity (fair value $182,376 and $194,886 at September 30, 2020 and December 31, 2019, respectively)	6,998			6,997
Securities Held-to-Maturity, Gross Unrealized Gains	202			66
Securities Held-to-Maturity, Gross Unrealized Losses	0			0
Securities Held-to-Maturity, Fair Value	7,200			7,063
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	0			301
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	0			0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0			(1)
Securities Available-for-Sale, Fair Value, Within 1 year	0			300
Securities Available-for-sale, Amortized Cost	0			301
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0			0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0			(1)
Securities Available-for-Sale, Debt Securities, Fair Value	0			300
Debt Securities, Available-for-sale, Allowance for Credit Loss, Within Twelve Months	0
Debt securities, available-for-sale, allowance for credit loss	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Year Two Through Five	0
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	3,645			4,717
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	41			23
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0			0
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	3,686			4,740
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	11,387			29,563
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	114			292
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0			0
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	11,501			29,855
Securities Available-for-sale, Amortized Cost	15,032			34,280
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	155			315
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0			0
Securities Available-for-Sale, Debt Securities, Fair Value	15,187			34,595
Debt securities, available-for-sale, allowance for credit loss	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Two Through Five	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Six Through Ten	0
Residential Mortgage-Backed Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity Securities, Amortized Cost, After 5 years to 10 years	7,065			9,083
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 years to 10 years	286			129
Securities Held-to-Maturity,Gross Unrecognized Losses, After 5 years to 10 years	0			0
Securities Held-to-Maturity, Fair Value, After 5 years to 10 years	7,351			9,212
Securities Held-to-Maturity, Over 10 years	162,754			175,972
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	5,071			2,749
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	0			(110)
Securities Held-to-Maturity, Fair Value, After 10 years	167,825			178,611
Investment securities held-to-maturity (fair value $182,376 and $194,886 at September 30, 2020 and December 31, 2019, respectively)	169,819			185,055
Securities Held-to-Maturity, Gross Unrealized Gains	5,357			2,878
Securities Held-to-Maturity, Gross Unrealized Losses	0			(110)
Securities Held-to-Maturity, Fair Value	175,176			187,823
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, After Five Years To Ten Years	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Over 10 Years	0
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	12			304
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	0			9
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0			0
Securities Available-for-Sale, Fair Value, Within 1 year	12			313
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	93			611
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	2			3
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0			(1)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	95			613
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	2,112			36,893
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	72			107
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0			(21)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	2,184			36,979
Securities Available-for-Sale, Amortized Cost, Over 10 years	77,400			80,630
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	2,041			378
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(61)			(453)
Securities Available-for-Sale, Fair Value, Over 10 years	79,380			80,555
Securities Available-for-sale, Amortized Cost	79,617			118,438
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	2,115			497
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(61)			(475)
Securities Available-for-Sale, Debt Securities, Fair Value	81,671			118,460
Debt Securities, Available-for-sale, Allowance for Credit Loss, Within Twelve Months	0
Debt securities, available-for-sale, allowance for credit loss	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Two Through Five	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Six Through Ten	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, After Ten Years	0
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	821			2,377
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	30			6
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0			(22)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	851			2,361
Securities Available-for-Sale, Amortized Cost, Over 10 years	4,982			0
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	0			0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(3)			0
Securities Available-for-Sale, Fair Value, Over 10 years	4,979			0
Securities Available-for-sale, Amortized Cost	5,803			2,377
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	30			6
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(3)			(22)
Securities Available-for-Sale, Debt Securities, Fair Value	5,830			2,361
Debt securities, available-for-sale, allowance for credit loss	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Six Through Ten	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, After Ten Years	0
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	999			6,012
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	4			1
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0			(4)
Securities Available-for-Sale, Fair Value, Within 1 year	1,003			6,009
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	29,751			29,606
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	1,637			596
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(1)			(61)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	31,386			30,141
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	60,000			0
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	0			0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(5,159)			0
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	54,150			0
Securities Available-for-Sale, Amortized Cost, Over 10 years	0			60,000
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	0			0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0			(4,942)
Securities Available-for-Sale, Fair Value, Over 10 years	0			55,058
Securities Available-for-sale, Amortized Cost	90,750			95,618
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1,641			597
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(5,160)			(5,007)
Securities Available-for-Sale, Debt Securities, Fair Value	86,539			91,208
Debt Securities, Available-for-sale, Allowance for Credit Loss, Within Twelve Months	0
Debt securities, available-for-sale, allowance for credit loss	692	$ 855	$ 0	$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Two Through Five	1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Six Through Ten	691
Debt Securities, Available-for-sale, Allowance for Credit Loss, After Ten Years	$ 0