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Fair Value Measurements - Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Total Available-for-Sale Securities $ 134,471 $ 123,537 [1]
Level 2    
Assets    
Total Available-for-Sale Securities 134,471 123,537
Recurring    
Assets    
Total Available-for-Sale Securities 134,471 123,537
Recurring | Securities of U.S. government and federal agencies    
Assets    
Total Available-for-Sale Securities 994 956
Recurring | Securities of state and local municipalities tax exempt    
Assets    
Total Available-for-Sale Securities 3,733 3,639
Recurring | Securities of state and local municipalities taxable    
Assets    
Total Available-for-Sale Securities 2,282 2,308
Recurring | Corporate bonds    
Assets    
Total Available-for-Sale Securities 4,971 5,013
Recurring | Certificates of deposit    
Assets    
Total Available-for-Sale Securities 245 244
Recurring | SBA pass-through securities    
Assets    
Total Available-for-Sale Securities 175 195
Recurring | Mortgage-backed securities    
Assets    
Total Available-for-Sale Securities 94,712 88,037
Recurring | Collateralized mortgage obligations    
Assets    
Total Available-for-Sale Securities 27,359 23,145
Recurring | Level 2    
Assets    
Total Available-for-Sale Securities 134,471 123,537
Recurring | Level 2 | Securities of U.S. government and federal agencies    
Assets    
Total Available-for-Sale Securities 994 956
Recurring | Level 2 | Securities of state and local municipalities tax exempt    
Assets    
Total Available-for-Sale Securities 3,733 3,639
Recurring | Level 2 | Securities of state and local municipalities taxable    
Assets    
Total Available-for-Sale Securities 2,282 2,308
Recurring | Level 2 | Corporate bonds    
Assets    
Total Available-for-Sale Securities 4,971 5,013
Recurring | Level 2 | Certificates of deposit    
Assets    
Total Available-for-Sale Securities 245 244
Recurring | Level 2 | SBA pass-through securities    
Assets    
Total Available-for-Sale Securities 175 195
Recurring | Level 2 | Mortgage-backed securities    
Assets    
Total Available-for-Sale Securities 94,712 88,037
Recurring | Level 2 | Collateralized mortgage obligations    
Assets    
Total Available-for-Sale Securities $ 27,359 $ 23,145
[1] Derived from audited consolidated financial statements.