Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 332,653
Equity securities, at fair value	1,830	$ 0
Securities available for sale, at fair value		321,337
Federal agencies and GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	134,039
Securities available for sale, at fair value		112,127
Mortgage-backed and CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	111,867
Securities available for sale, at fair value		105,316
State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	79,902
Securities available for sale, at fair value		93,626
Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	6,845
Securities available for sale, at fair value		8,062
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value		2,206
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Equity securities, at fair value	0
Securities available for sale, at fair value		0
Derivative - cash flow hedges	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	332,653
Equity securities, at fair value	1,830
Securities available for sale, at fair value		321,337
Derivative - cash flow hedges	804
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Equity securities, at fair value	0
Securities available for sale, at fair value		0
Derivative - cash flow hedges	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	332,653
Equity securities, at fair value	1,830
Securities available for sale, at fair value		321,337
Derivative - cash flow hedges	804
Recurring | Federal agencies and GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	134,039
Securities available for sale, at fair value		112,127
Recurring | Mortgage-backed and CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	111,867
Securities available for sale, at fair value		105,316
Recurring | State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	79,902
Securities available for sale, at fair value		93,626
Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	6,845
Securities available for sale, at fair value		8,062
Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value		2,206
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Equity securities, at fair value	0
Securities available for sale, at fair value		0
Derivative - cash flow hedges	0
Recurring | Level 1 | Federal agencies and GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 1 | Mortgage-backed and CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 1 | State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 1 | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value		0
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	332,653
Equity securities, at fair value	1,830
Securities available for sale, at fair value		321,337
Derivative - cash flow hedges	804
Recurring | Level 2 | Federal agencies and GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	134,039
Securities available for sale, at fair value		112,127
Recurring | Level 2 | Mortgage-backed and CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	111,867
Securities available for sale, at fair value		105,316
Recurring | Level 2 | State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	79,902
Securities available for sale, at fair value		93,626
Recurring | Level 2 | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	6,845
Securities available for sale, at fair value		8,062
Recurring | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value		2,206
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Equity securities, at fair value	0
Securities available for sale, at fair value		0
Derivative - cash flow hedges	0
Recurring | Level 3 | Federal agencies and GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 3 | Mortgage-backed and CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 3 | State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0
Securities available for sale, at fair value		0
Recurring | Level 3 | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 0
Securities available for sale, at fair value		0
Recurring | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value		$ 0