Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 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 $208,307 and $194,886 at June 30, 2020 and December 31, 2019, respectively)	$ 201,703			$ 192,052
Securities Held-to-Maturity, Gross Unrealized Gains	6,604			2,944
Securities Held-to-Maturity, Gross Unrealized Losses	0			(110)
Securities Held-to-Maturity, Fair Value	208,307			194,886
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-sale, Amortized Cost	196,846			251,014
Securities Available-for-Sale, Debt Securities, Fair Value	194,201			246,924
Debt Securities, Available-For-Sale And Held-To-Maturity, Amortized Cost	196,846			251,014
Securities Available-for-Sale,Gross Unrealized Gain	3,812			1,415
Securities Available-for-Sale, Gross Unrealized Loss	(5,602)			(5,505)
Securities Available-for-Sale, Fair Value	194,201			246,924
Debt securities, available-for-sale, allowance for credit loss	855
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	226			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	7,224			7,063
Investment securities held-to-maturity (fair value $208,307 and $194,886 at June 30, 2020 and December 31, 2019, respectively)	6,998			6,997
Securities Held-to-Maturity, Gross Unrealized Gains	226			66
Securities Held-to-Maturity, Gross Unrealized Losses	0			0
Securities Held-to-Maturity, Fair Value	7,224			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	3,644			4,717
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	45			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	3,689			4,740
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	17,708			29,563
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	181			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	17,889			29,855
Securities Available-for-sale, Amortized Cost	21,352			34,280
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	226			315
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0			0
Securities Available-for-Sale, Debt Securities, Fair Value	21,578			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	7,810			9,083
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 years to 10 years	337			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	8,147			9,212
Securities Held-to-Maturity, Over 10 years	186,895			175,972
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	6,041			2,749
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	0			(110)
Securities Held-to-Maturity, Fair Value, After 10 years	192,936			178,611
Investment securities held-to-maturity (fair value $208,307 and $194,886 at June 30, 2020 and December 31, 2019, respectively)	194,705			185,055
Securities Held-to-Maturity, Gross Unrealized Gains	6,378			2,878
Securities Held-to-Maturity, Gross Unrealized Losses	0			(110)
Securities Held-to-Maturity, Fair Value	201,083			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	83			304
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	4			9
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0			0
Securities Available-for-Sale, Fair Value, Within 1 year	87			313
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	121			611
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	3			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	124			613
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	2,362			36,893
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	86			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	2,448			36,979
Securities Available-for-Sale, Amortized Cost, Over 10 years	75,629			80,630
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	2,184			378
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0			(453)
Securities Available-for-Sale, Fair Value, Over 10 years	77,813			80,555
Securities Available-for-sale, Amortized Cost	78,195			118,438
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	2,277			497
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0			(475)
Securities Available-for-Sale, Debt Securities, Fair Value	80,472			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	922			2,377
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	35			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	957			2,361
Securities Available-for-Sale, Amortized Cost, Over 10 years	5,123			0
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	0			0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0			0
Securities Available-for-Sale, Fair Value, Over 10 years	5,123			0
Securities Available-for-sale, Amortized Cost	6,045			2,377
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	35			6
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0			(22)
Securities Available-for-Sale, Debt Securities, Fair Value	6,080			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	1,000			6,012
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	10			1
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0			(4)
Securities Available-for-Sale, Fair Value, Within 1 year	1,010			6,009
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	29,340			29,606
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	1,246			596
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(32)			(61)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	30,548			30,141
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	40,914			0
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	18			0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(4,257)			0
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	36,166			0
Securities Available-for-Sale, Amortized Cost, Over 10 years	20,000			60,000
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	0			0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(1,313)			(4,942)
Securities Available-for-Sale, Fair Value, Over 10 years	18,347			55,058
Securities Available-for-sale, Amortized Cost	91,254			95,618
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1,274			597
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(5,602)			(5,007)
Securities Available-for-Sale, Debt Securities, Fair Value	86,071			91,208
Debt Securities, Available-for-sale, Allowance for Credit Loss, Within Twelve Months	0
Debt securities, available-for-sale, allowance for credit loss	855	$ 897	$ 0	$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Two Through Five	6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Year Six Through Ten	509
Debt Securities, Available-for-sale, Allowance for Credit Loss, After Ten Years	$ 340