Investment Securities - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019 USD ($) Security	Jun. 30, 2018 USD ($) Security	Dec. 31, 2018 USD ($) Security
Held-to-maturity Securities [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	8		15
Held to maturity sale securities aggregate market value	$ 6,653,000		$ 11,430,000
Held-to-maturity securities unrealized aggregate loss	48,000		316,000
Gain (Loss) on Sale of Investments [Abstract]
Securities pledged to collateralize deposit	87,900,000		69,800,000
Securities pledged to collateralize borrowing	$ 24,900,000		$ 19,500,000
Municipal Securities [Member]
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]
Months of unrealized loss positions	12 months
State and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	1		26
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis	$ 3,000,000
Available for sale securities aggregate market value	3,001,000		$ 14,206,000
Available for sale securities unrealized aggregate loss	$ 3,000		$ 526,000
Available for sale securities unrealized aggregate loss percentage	0.10%
Held-to-maturity Securities [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	1	1	6
Held to maturity securities continuous unrealized loss position greater than twelve months amortized historical cost basis		$ 100,000,000,000
Held to maturity sale securities aggregate market value	$ 101,000	100,000,000,000	$ 2,310,000
Held-to-maturity securities unrealized aggregate loss	$ 0	$ 1,000	$ 84,000
Held-to-maturity securities unrealized aggregate loss percentage		0.02%
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	5	5	4
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis		$ 4,000,000
Available for sale securities aggregate market value	$ 4,000,000	4,000,000	$ 3,374,000
Available for sale securities unrealized aggregate loss	$ 48,000	$ 48,000	$ 272,000
Available for sale securities unrealized aggregate loss percentage		1.20%
Held-to-maturity Securities [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	2		2
Held to maturity securities continuous unrealized loss position greater than twelve months amortized historical cost basis	$ 2,900,000
Held to maturity sale securities aggregate market value	2,849,000		$ 2,507,000
Held-to-maturity securities unrealized aggregate loss	$ 39,000		$ 141,000
Held-to-maturity securities unrealized aggregate loss percentage	1.36%
Fixed Rate, Private-label Asset-backed Security Rated [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	2
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis	$ 3,100,000
Available for sale securities aggregate market value	3,100,000
Available for sale securities unrealized aggregate loss	$ 23,000
Available for sale securities unrealized aggregate loss percentage	0.73%
Fixed Rate, Private-label Mortgage-backed Security not Rated [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	2
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis	$ 1,300,000
Available for sale securities aggregate market value	1,300,000
Available for sale securities unrealized aggregate loss	$ 9,000
Available for sale securities unrealized aggregate loss percentage	0.70%
Held-to-maturity Securities [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	1
Held to maturity securities continuous unrealized loss position greater than twelve months amortized historical cost basis	$ 633,000
Held to maturity sale securities aggregate market value	632,000
Held-to-maturity securities unrealized aggregate loss	$ 1,000
Held-to-maturity securities unrealized aggregate loss percentage	0.09%
Fixed Rate, Private-label Mortgage-backed Security Two [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	2
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis	$ 2,300,000
Available for sale securities aggregate market value	2,300,000
Available for sale securities unrealized aggregate loss	$ 26,000
Available for sale securities unrealized aggregate loss percentage	1.10%
Held-to-maturity Securities [Abstract]
Number of securities in unrealized loss positions, twelve months or more | Security	1
Held to maturity securities continuous unrealized loss position greater than twelve months amortized historical cost basis	$ 839,000
Held to maturity sale securities aggregate market value	834,000
Held-to-maturity securities unrealized aggregate loss	$ 4,000
Held-to-maturity securities unrealized aggregate loss percentage	0.53%