Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - summary of fair values for assets and liabilities (Details)

v3.19.3.a.u2
FAIR VALUE MEASUREMENTS - summary of fair values for assets and liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
U.S. Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure $ 232,778 $ 261,849
U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 156,078 133,206
States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 6,319 42,365
Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 773 943
Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 7,653 7,794
Level 1 Inputs [Member] | U.S. Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 232,778 261,849
Level 1 Inputs [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 2 Inputs [Member] | U.S. Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 2 Inputs [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 156,078 133,206
Level 2 Inputs [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 6,319 42,365
Level 2 Inputs [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 773 943
Level 2 Inputs [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 7,653 7,794
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure $ 0 $ 0