Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Securities available for sale	$ 379,195	$ 332,653
Equity securities	0	1,830
U.S. Treasury
Assets:
Securities available for sale	14,987
Federal agencies and GSEs
Assets:
Securities available for sale	128,114	134,039
Mortgage-backed and CMOs
Assets:
Securities available for sale	184,240	111,867
State and municipal
Assets:
Securities available for sale	42,154	79,902
Corporate
Assets:
Securities available for sale	9,700	6,845
Level 1
Assets:
Securities available for sale	0	0
Equity securities		0
Liabilities:
Derivative - cash flow hedges	0	0
Level 2
Assets:
Securities available for sale	379,195	332,653
Equity securities		1,830
Liabilities:
Derivative - cash flow hedges	2,658	804
Level 3
Assets:
Securities available for sale	0	0
Equity securities		0
Liabilities:
Derivative - cash flow hedges	0	0
Recurring
Assets:
Securities available for sale	379,195	332,653
Equity securities		1,830
Liabilities:
Derivative - cash flow hedges	2,658	804
Recurring | U.S. Treasury
Assets:
Securities available for sale	14,987
Recurring | Federal agencies and GSEs
Assets:
Securities available for sale	128,114	134,039
Recurring | Mortgage-backed and CMOs
Assets:
Securities available for sale	184,240	111,867
Recurring | State and municipal
Assets:
Securities available for sale	42,154	79,902
Recurring | Corporate
Assets:
Securities available for sale	9,700	6,845
Recurring | Level 1
Assets:
Securities available for sale	0	0
Equity securities		0
Liabilities:
Derivative - cash flow hedges	0	0
Recurring | Level 1 | U.S. Treasury
Assets:
Securities available for sale	0
Recurring | Level 1 | Federal agencies and GSEs
Assets:
Securities available for sale	0	0
Recurring | Level 1 | Mortgage-backed and CMOs
Assets:
Securities available for sale	0	0
Recurring | Level 1 | State and municipal
Assets:
Securities available for sale	0	0
Recurring | Level 1 | Corporate
Assets:
Securities available for sale	0	0
Recurring | Level 2
Assets:
Securities available for sale	379,195	332,653
Equity securities		1,830
Liabilities:
Derivative - cash flow hedges	2,658	804
Recurring | Level 2 | U.S. Treasury
Assets:
Securities available for sale	14,987
Recurring | Level 2 | Federal agencies and GSEs
Assets:
Securities available for sale	128,114	134,039
Recurring | Level 2 | Mortgage-backed and CMOs
Assets:
Securities available for sale	184,240	111,867
Recurring | Level 2 | State and municipal
Assets:
Securities available for sale	42,154	79,902
Recurring | Level 2 | Corporate
Assets:
Securities available for sale	9,700	6,845
Recurring | Level 3
Assets:
Securities available for sale	0	0
Equity securities		0
Liabilities:
Derivative - cash flow hedges	0	0
Recurring | Level 3 | U.S. Treasury
Assets:
Securities available for sale	0
Recurring | Level 3 | Federal agencies and GSEs
Assets:
Securities available for sale	0	0
Recurring | Level 3 | Mortgage-backed and CMOs
Assets:
Securities available for sale	0	0
Recurring | Level 3 | State and municipal
Assets:
Securities available for sale	0	0
Recurring | Level 3 | Corporate
Assets:
Securities available for sale	$ 0	$ 0