Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Securities available for sale, at fair value	$ 280,503	$ 346,502	[1]
Level 1
Assets:
Securities available for sale, at fair value	0	0
Level 2
Assets:
Securities available for sale, at fair value	280,503	346,502
Level 3
Assets:
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	280,503	346,502
Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	280,503	346,052
Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	0	0
Federal agencies and GSEs
Assets:
Securities available for sale, at fair value	91,692	104,054
Federal agencies and GSEs | Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	91,692	104,054
Federal agencies and GSEs | Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
Federal agencies and GSEs | Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	91,692	104,054
Federal agencies and GSEs | Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	0	0
Mortgage-backed and CMOs
Assets:
Securities available for sale, at fair value	79,068	79,493
Mortgage-backed and CMOs | Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	79,068	79,493
Mortgage-backed and CMOs | Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
Mortgage-backed and CMOs | Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	79,068	79,493
Mortgage-backed and CMOs | Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	0	0
State and municipal
Assets:
Securities available for sale, at fair value	99,205	147,515
State and municipal | Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	99,205	147,515
State and municipal | Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
State and municipal | Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	99,205	147,515
State and municipal | Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	0	0
Corporate
Assets:
Securities available for sale, at fair value	8,315	13,492
Corporate | Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	8,315	13,492
Corporate | Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
Corporate | Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	8,315	13,492
Corporate | Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	0	0
Equity securities
Assets:
Securities available for sale, at fair value	2,223	1,948
Equity securities | Fair Value, Measurements, Recurring
Assets:
Securities available for sale, at fair value	2,223	1,948
Equity securities | Fair Value, Measurements, Recurring | Level 1
Assets:
Securities available for sale, at fair value	0	0
Equity securities | Fair Value, Measurements, Recurring | Level 2
Assets:
Securities available for sale, at fair value	2,223	1,498
Equity securities | Fair Value, Measurements, Recurring | Level 3
Assets:
Securities available for sale, at fair value	$ 0	$ 0

[1] Derived from audited consolidated financial statements.