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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets [Abstract]    
Available for sale securities $ 71,884 $ 72,153
Obligations of U.S. Government Corporations and Agencies [Member]    
Assets [Abstract]    
Available for sale securities 56,409 52,377
Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Available for sale securities 14,580 15,255
Corporate Bonds [Member]    
Assets [Abstract]    
Available for sale securities 895 [1] 4,139
Mutual Funds [Member]    
Assets [Abstract]    
Available for sale securities   382
Fair Value on a Recurring Basis [Member]    
Assets [Abstract]    
Available for sale securities 71,884 72,153
Mutual funds 382  
Interest rate swaps 367 233
Total assets at fair value 72,633 72,386
Liabilities [Abstract]    
Interest rate swaps 38 119
Total liabilities at fair value 38 119
Fair Value on a Recurring Basis [Member] | Obligations of U.S. Government Corporations and Agencies [Member]    
Assets [Abstract]    
Available for sale securities 56,409 52,377
Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Available for sale securities 14,580 15,255
Fair Value on a Recurring Basis [Member] | Corporate Bonds [Member]    
Assets [Abstract]    
Available for sale securities 895 4,139
Fair Value on a Recurring Basis [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Available for sale securities   382
Level 1 [Member]    
Assets [Abstract]    
Available for sale securities 0 382
Mutual funds 382  
Interest rate swaps 0 0
Total assets at fair value 67,492 29,473
Liabilities [Abstract]    
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Level 1 [Member] | Fair Value on a Recurring Basis [Member]    
Assets [Abstract]    
Available for sale securities 0 382
Mutual funds 382  
Interest rate swaps 0 0
Total assets at fair value 382 382
Liabilities [Abstract]    
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Level 1 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of U.S. Government Corporations and Agencies [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Level 1 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Level 1 [Member] | Fair Value on a Recurring Basis [Member] | Corporate Bonds [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Level 1 [Member] | Fair Value on a Recurring Basis [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Available for sale securities   382
Level 2 [Member]    
Assets [Abstract]    
Available for sale securities 71,884 71,771
Mutual funds 0  
Interest rate swaps 367 233
Total assets at fair value 624,662 582,867
Liabilities [Abstract]    
Interest rate swaps 38 119
Total liabilities at fair value 663,302 581,426
Level 2 [Member] | Fair Value on a Recurring Basis [Member]    
Assets [Abstract]    
Available for sale securities 71,884 71,771
Mutual funds 0  
Interest rate swaps 367 233
Total assets at fair value 72,251 72,004
Liabilities [Abstract]    
Interest rate swaps 38 119
Total liabilities at fair value 38 119
Level 2 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of U.S. Government Corporations and Agencies [Member]    
Assets [Abstract]    
Available for sale securities 56,409 52,377
Level 2 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Available for sale securities 14,580 15,255
Level 2 [Member] | Fair Value on a Recurring Basis [Member] | Corporate Bonds [Member]    
Assets [Abstract]    
Available for sale securities 895 4,139
Level 2 [Member] | Fair Value on a Recurring Basis [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Available for sale securities   0
Level 3 [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Mutual funds 0  
Interest rate swaps 0 0
Total assets at fair value 2,438 46
Liabilities [Abstract]    
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Level 3 [Member] | Fair Value on a Recurring Basis [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Mutual funds 0  
Interest rate swaps 0 0
Total assets at fair value 0 0
Liabilities [Abstract]    
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Level 3 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of U.S. Government Corporations and Agencies [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Level 3 [Member] | Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Available for sale securities 0 0
Level 3 [Member] | Fair Value on a Recurring Basis [Member] | Corporate Bonds [Member]    
Assets [Abstract]    
Available for sale securities $ 0 0
Level 3 [Member] | Fair Value on a Recurring Basis [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Available for sale securities   $ 0
[1] Current Moody’s Ratings range from B2 to Ba2.