Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	$ 112,643	$ 151,257
Securities Held-to-Maturity, Gross Unrealized Gains	3,390	5,068
Securities Held-to-Maturity, Gross Unrealized Losses	(372)	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	115,661	156,325
Debt Securities, Available-for-sale [Abstract]
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	278,923	221,254
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	2,282	3,783
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(2,617)	(5,528)
Debt securities, available-for-sale, allowance for credit loss	(815)	(869)
Securities Available-for-Sale, Debt Securities, Fair Value	277,773	218,640
U.S. Government Corporations and Agencies [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost, Within 1 Year	6,999
Securities Held-to-Maturity, Gross Unrealized Gains, Within 1 Year	72
Securities Held-to-Maturity, Gross Unrealized Losses, Within 1 Year	0
Securities, Held to Maturity, Allowance for Credit Loss, Within 1 Year	0
Securities Held-to-Maturity, Fair Value, Within 1 Year	7,071
Securities Held-to-Maturity, Amortized Cost, After 1 Year to 5 Years		6,998
Securities Held-to-maturity, Gross Unrealized Gains, After 1 Year to 5 Years		171
Securities Held-to-Maturity, Gross Unrealized Loss, After 1 Year to 5 Years		0
Securities Held-to-Maturity, Allowance for Credit Loss, After 1 Year to 5 Years		0
Securities Held-to-Maturity, Fair Value, After 1 Year to 5 Years		7,169
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	6,999	6,998
Securities Held-to-Maturity, Gross Unrealized Gains	72	171
Securities Held-to-Maturity, Gross Unrealized Losses	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	7,071	7,169
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 Year to 5 Years	2,325	3,560
Securities Available-for-Sale,Gross Unrealized Gain, After 1 Year to 5 Years	8	33
Securities Available-for-Sale, Gross Unrealized Losses, After 1 Year to 5 Years	0	0
Securities Available-for-sale, Allowance for Credit Loss, After 1 Year to 5 Years	0	0
Securities Available-for-Sale, Fair Value, After 1 Year to 5 Years	2,333	3,593
Securities Available-for-Sale, Amortized Cost, After 5 Years to 10 Years		9,881
Securities Available-for-Sale,Gross Unrealized Gain, After 5 Years to 10 Years		63
Securities Available-for-Sale, Gross Unrealized Losses, After 5 Years to 10 Years		0
Securities Available-for-sale, Allowance for Credit Loss, After 5 Years to 10 Years		0
Securities Available-for-Sale, Fair Value, After 5 Years to 10 Years		9,944
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	2,325	13,441
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	8	96
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0	0
Debt securities, available-for-sale, allowance for credit loss	0	0
Securities Available-for-Sale, Debt Securities, Fair Value	2,333	13,537
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	5,761	6,325
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 Years to 10 Years	251	253
Securities Held-to-Maturity, Gross Unrealized Losses, After 5 Years to 10 Years	0	0
Securities, Held-to-maturity, Allowance for Credit Loss, After 5 Years To 10 Years	0	0
Securities Held-to-Maturity, Fair Value, After 5 Years to 10 Years	6,012	6,578
Securities Held-to-Maturity, Amortized Cost, Over 10 Years	99,883	137,934
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	3,067	4,644
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	(372)	0
Securities Held-to-maturity, Allowance for Credit Loss, Over 10 Years	0	0
Securities Held-to-Maturity, Fair Value, After 10 years	102,578	142,578
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	105,644	144,259
Securities Held-to-Maturity, Gross Unrealized Gains	3,318	4,897
Securities Held-to-Maturity, Gross Unrealized Losses	(372)	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	108,590	149,156
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 Year to 5 Years	214	323
Securities Available-for-Sale,Gross Unrealized Gain, After 1 Year to 5 Years	7	10
Securities Available-for-Sale, Gross Unrealized Losses, After 1 Year to 5 Years	0	0
Securities Available-for-sale, Allowance for Credit Loss, After 1 Year to 5 Years	0	0
Securities Available-for-Sale, Fair Value, After 1 Year to 5 Years	221	333
Securities Available-for-Sale, Amortized Cost, After 5 Years to 10 Years	1,785	1,664
Securities Available-for-Sale,Gross Unrealized Gain, After 5 Years to 10 Years	73	58
Securities Available-for-Sale, Gross Unrealized Losses, After 5 Years to 10 Years	0	0
Securities Available-for-sale, Allowance for Credit Loss, After 5 Years to 10 Years	0	0
Securities Available-for-Sale, Fair Value, After 5 Years to 10 Years	1,858	1,722
Securities Available-for-Sale, Amortized Cost, Over 10 Years	179,675	110,018
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 Years	1,101	2,153
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 Years	(2,013)	(63)
Securities Available-for-sale, Allowance for Credit Loss, After 10 Years	0	0
Securities Available-for-Sale, Fair Value, Over 10 Years	178,763	112,108
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	181,674	112,005
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1,181	2,221
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(2,013)	(63)
Debt securities, available-for-sale, allowance for credit loss	0	0
Securities Available-for-Sale, Debt Securities, Fair Value	180,842	114,163
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 5 Years to 10 Years	528	754
Securities Available-for-Sale,Gross Unrealized Gain, After 5 Years to 10 Years	13	21
Securities Available-for-Sale, Gross Unrealized Losses, After 5 Years to 10 Years	0	0
Securities Available-for-sale, Allowance for Credit Loss, After 5 Years to 10 Years	0	0
Securities Available-for-Sale, Fair Value, After 5 Years to 10 Years	541	775
Securities Available-for-Sale, Amortized Cost, Over 10 Years	3,158	4,561
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 Years	9	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 Years	0	(15)
Securities Available-for-sale, Allowance for Credit Loss, After 10 Years	0	0
Securities Available-for-Sale, Fair Value, Over 10 Years	3,167	4,546
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	3,686	5,315
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	22	21
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0	(15)
Debt securities, available-for-sale, allowance for credit loss	0	0
Securities Available-for-Sale, Debt Securities, Fair Value	3,708	5,321
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 Year	3,500	499
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 Year	15	2
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 Year	0	0
Securities Available-for-sale, Allowance for Credit Loss, Within 1 Year	0	0
Securities Available-for-Sale, Fair Value, Within 1 Year	3,515	501
Securities Available-for-Sale, Amortized Cost, After 1 Year to 5 Years	27,738	29,498
Securities Available-for-Sale,Gross Unrealized Gain, After 1 Year to 5 Years	1,056	1,440
Securities Available-for-Sale, Gross Unrealized Losses, After 1 Year to 5 Years	(14)	0
Securities Available-for-sale, Allowance for Credit Loss, After 1 Year to 5 Years	(23)	(16)
Securities Available-for-Sale, Fair Value, After 1 Year to 5 Years	28,757	30,922
Securities Available-for-Sale, Amortized Cost, After 5 Years to 10 Years	60,000	60,496
Securities Available-for-Sale,Gross Unrealized Gain, After 5 Years to 10 Years	0	3
Securities Available-for-Sale, Gross Unrealized Losses, After 5 Years to 10 Years	(590)	(5,450)
Securities Available-for-sale, Allowance for Credit Loss, After 5 Years to 10 Years	(792)	(853)
Securities Available-for-Sale, Fair Value, After 5 Years to 10 Years	58,618	54,196
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	91,238	90,493
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1,071	1,445
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(604)	(5,450)
Debt securities, available-for-sale, allowance for credit loss	(815)	(869)	$ (692)	$ 0
Securities Available-for-Sale, Debt Securities, Fair Value	$ 90,890	$ 85,619