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Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financial assets [Abstract]    
Interest bearing time deposits with other banks $ 14,754 $ 10,283
Available-for-sale securities   254,782
Level I [Member] | Recurring [Member]    
Financial assets [Abstract]    
Cash and due from banks 16,500 18,517
Interest bearing time deposits with other banks 0 0
Equity securities 291  
Available-for-sale securities 32,837  
Loans held for sale 960 1,439
Net loans 0 0
Bank owned life insurance 27,350 26,883
Regulatory stock 5,661 6,784
Accrued interest receivable 4,480 4,196
Financial liabilities [Abstract]    
Deposits 882,539 838,490
Borrowed funds 49,631 77,650
Accrued interest payable 979 897
Level II [Member] | Recurring [Member]    
Financial assets [Abstract]    
Cash and due from banks 0 0
Interest bearing time deposits with other banks 0 0
Equity securities 0  
Available-for-sale securities 207,589  
Loans held for sale 0  
Net loans 0 0
Bank owned life insurance 0 0
Regulatory stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 0 0
Borrowed funds 0 0
Accrued interest payable 0 0
Level III [Member] | Recurring [Member]    
Financial assets [Abstract]    
Cash and due from banks 0 0
Interest bearing time deposits with other banks 14,773 10,287
Equity securities 0  
Available-for-sale securities 0  
Loans held for sale 0  
Net loans 1,037,065 981,238
Bank owned life insurance 0 0
Regulatory stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 286,295 263,093
Borrowed funds 35,055 35,802
Accrued interest payable 0 0
Carrying Amount [Member] | Recurring [Member]    
Financial assets [Abstract]    
Cash and due from banks 16,500 18,517
Interest bearing time deposits with other banks 14,754 10,283
Equity securities 291  
Available-for-sale securities 240,426  
Loans held for sale 960 1,439
Net loans 1,047,948 989,335
Bank owned life insurance 27,350 26,883
Regulatory stock 5,661 6,784
Accrued interest receivable 4,480 4,196
Financial liabilities [Abstract]    
Deposits 1,174,843 1,104,943
Borrowed funds 86,097 114,664
Accrued interest payable 979 897
Fair Value [Member] | Recurring [Member]    
Financial assets [Abstract]    
Cash and due from banks 16,500 18,517
Interest bearing time deposits with other banks 14,773 10,287
Equity securities 291  
Available-for-sale securities 240,426  
Loans held for sale 960 1,439
Net loans 1,037,065 981,238
Bank owned life insurance 27,350 26,883
Regulatory stock 5,661 6,784
Accrued interest receivable 4,480 4,196
Financial liabilities [Abstract]    
Deposits 1,168,834 1,101,583
Borrowed funds 84,686 113,452
Accrued interest payable $ 979 $ 897